Examination of Exercise Effects on Knee Osteoarthritis Outcomes: Why Should the Local Mechanical Environment Be Considered?
|
|
- Melvin Hardy
- 6 years ago
- Views:
Transcription
1 Arthritis & Rheumatism (Arthritis Care & Research) Vol. 49, No. 2, April 15, 2003, pp DOI /art , American College of Rheumatology SPECIAL ARTICLE Examination of Exercise Effects on Knee Osteoarthritis Outcomes: Why Should the Local Mechanical Environment Be Considered? LEENA SHARMA Presented at the International Conference on Health Promotion and Disability Prevention for Individuals and Populations with Rheumatic Disease: Evidence for Exercise and Physical Activity, St. Louis, MO, September Leena Sharma, MD: Northwestern University Medical School, Chicago, Illinois. Address correspondence to Leena Sharma, MD, Associate Professor, Division of Rheumatology, Northwestern University Medical School, 303 E. Chicago Avenue, Ward Building 3-315, Chicago, IL edu. Submitted for publication May 17, 2002; accepted in revised form August 14, Introduction Osteoarthritis (OA) is the most common form of human arthritis. Almost every older adult has some evidence of radiographic OA: 905 of 1,040 participants aged years in the Rotterdam study had definite radiographic OA in the hands, knees, hips, or spine (1). Although less prevalent than radiographic OA, symptomatic OA is a leading cause of chronic disability. It is estimated that 12% of Americans between ages 25 and 75 years have clinical signs and symptoms of OA (2). Disability due to OA is largely a result of knee or hip involvement. The risk of disability attributable to knee OA alone is as great as that due to cardiovascular disease and greater than that due to any other medical condition in elderly persons (3). Beyond its direct effect, knee OA synergistically increases the risk of disability originating from other medical conditions (4). Exercise is widely used in the management of knee OA, based on the results of predominantly short-term trials that demonstrate a clear beneficial effect on both symptoms and physical function. Less is known about the effect of exercise on structural outcome i.e., new OA development and progression of established OA or on risk of chronic disability. Buckwalter and Lane propose that exercise (especially exercise that involves repetitive impact or torsion) may have a more deleterious effect in joints that have a local anatomic or physiologic impairment (5). From the perspective of the local environment, OA knees are heterogeneous. Local mechanical factors may be thought of as factors that have a clinically important biomechanical effect, may be linked to joint anatomy or physiology, and are specific to joint site. In published investigations, exercise effects have commonly been examined in samples narrowed to include subjects with OA predominantly at the joint site of interest, e.g., the knee. To date, minimal attention has been devoted to the examination of whether exercise effects differ between subsets of OA knees based upon local mechanical factors. Statement of the Problem In studies of arthritis that deal with the effect of specific exercise programs, investigators have endeavored to examine homogeneous samples of subjects. It is generally believed that homogeneity has been achieved when the sample includes subjects with a single type of arthritis, at a single joint site of predominant involvement. These criteria for homogeneity are essential but may not be sufficient: a single type of arthritis (i.e., OA) even at a single joint site (the knee) is a heterogeneous condition in terms of the local joint-organ environment. The same exercise program may have a dissimilar effect on different knee subsets based on local mechanical environment. Such variation in effect would dilute the detected impact of the intervention on study outcomes in therapeutic trials that consider the gamut of OA knees together, and may explain in part the relatively modest impact of exercise interventions on physical function in many trials. Ultimately, exercise interventions for those with knee OA may be more effective if they are tailored to knee subset. Review of the Literature There is increasing awareness that the profiles of determinants of symptoms, physical function, and structural disease outcomes are not identical in OA; the effect of any intervention on each of these outcomes needs to be specifically examined. In the exercise literature dealing with knee OA, several studies demonstrate a beneficial effect of exercise on symptoms and on patient-centered physical function. In terms of structural outcome, there is minimal 255
2 256 Sharma information on either risk of incident or progressive OA. Nonoccupational physical activity in general (with the exception of certain elite athletic activities) was not associated with an increase in the risk of newly occurring, knee OA in most studies in which this has been examined (6). The lack of attention to the effect of exercise on disease progression is multifactorial. Even with x-ray acquisition and measurement protocols that increase the ability to detect change, the study duration required to gauge the effect of an exercise intervention on radiographic disease progression may be prolonged and the necessary sample size large. Magnetic resonance imaging (MRI)-based outcome measures may be superior in terms of reducing study duration and sample size but are expensive. Ensuring compliance with any intervention in a therapeutic trial over a long followup is challenging; this challenge can be even greater with exercise interventions. Despite these challenges, the effect of exercise on incident OA, OA disease course, and disability each warrant further study. In theory, specific exercise programs might have some disease-modifying effect (i.e., delay progression or worsening of OA) via beneficial actions on joint tissues and the potential to enhance joint-protective mechanisms. Manipulating the local mechanical environment is relatively untapped as a strategy to delay disease progression. In addition, specific exercise programs may differ in their impact on physical function and on disability risk. It is unlikely that a single exercise program will serve the heterogeneous process labeled knee OA. In the evaluation of exercise intervention on structure and disability outcomes, the local mechanical environment needs to be considered for at least 2 reasons: To stratify response to broadly applied exercise approaches according to presence/absence or severity of local impairment; and to develop exercise interventions that are tailored to knee OA subset. The biomechanics literature and clinical OA literature offer insight into which local factors to consider in the derivation of subsets of OA knees. Malalignment and laxity are local impairments that are common in knee OA though of variable severity, influence load distribution at the knee, and can be measured relatively easily in clinical settings. This is not equivalent to subsetting according to OA disease stage or severity. In many individuals, abnormalities in alignment and/or laxity may be present prior to or at early stages of OA. Also, specific features of OA disease may have opposing effects on a given local impairment (e.g., as described for laxity below). It is likely that the effect of an exercise intervention will differ between knees that are malaligned versus closer to neutral in alignment, between lax versus stable knees. These are subsets that differ in structural vulnerability to the forces that develop during exercise or physical activity. Examining exercise interventions according to knee alignment. Alignment (i.e., the hip-knee-ankle angle) is a key determinant of load distribution at the knee. In theory, any shift from a neutral or collinear alignment of the hip, knee, and ankle affects load distribution at the knee (7). In a varus knee, the load-bearing axis passes medial to the knee, and a moment arm is created that increases force across the medial compartment. In a valgus knee, the loadbearing axis passes lateral to the knee, and the resulting moment arm increases force across the lateral compartment. Biomechanical studies support that varus and valgus alignment increase medial and lateral load, respectively (7 9). Also, severity of varus alignment correlates with the ratio of medial to lateral bone mineral density in patients with OA, i.e., greater density in the higher loadbearing region (10). During gait, disproportionate transmission of load to the medial compartment results from a stance-phase adduction moment (11). The adduction moment reflects the magnitude of intrinsic compressive load on the medial compartment (12). Varus-valgus alignment is a key determinant of this moment. Varus alignment further increases medial load during gait (13). Valgus alignment is associated with an increase in lateral compartment peak pressures (9); however, more load is still borne medially until more severe valgus is present (14,15). In theory, varus and valgus alignment may each be both a cause and result of progressive knee OA. Varus or valgus alignment that predates knee OA may be due to genetic, developmental, or posttraumatic factors. Animal model data support a link between preexisting varus or valgus alignment and OA development (7). Knee alignment that results from knee OA may be due to loss of cartilage and bone height. A large body of literature gives evidence that preoperative alignment is a determinant of the outcome of surgical procedures involving the knee (e.g., arthroplasty, osteotomy, complete or partial meniscectomy, meniscal debridement). In the operated knee, the development or progression of OA is linked to several factors not at play in the examination of natural progression (e.g., nature of surgery, stage of OA at time of surgery, complications). Considerably less attention has been paid to the role of knee alignment in the nonsurgical, natural evolution of knee OA. Few longitudinal studies have dealt with alignment and the natural history of OA. Schouten et al found that subject recollection of bow legs or knock knees in childhood was associated with a 5-fold increase in the risk of OA progression (odds ratio [OR] 5.13, 95% confidence interval [95% CI] ) over a 12-year period, after adjusting for age, sex, and body mass index (BMI) (16). In another study involving patients from a hospital practice who had not undergone surgery, and in whom alignment was considered at the end of followup, 50% of 35 varus knees had progressive joint space narrowing (17). We recently reported on the effect of varus and valgus alignment measured at baseline on subsequent progression of medial and lateral tibiofemoral OA, respectively, in 240 community-recruited subjects with knee OA (with definite osteophyte presence and at least a little difficulty with physical function) (18). Alignment was measured as the angle made by the intersection of the femoral and tibial mechanical axes from a full-limb radiograph. Knees with grade 3 (most severe) joint space narrowing at baseline were excluded. First, the relationship between baseline varus alignment
3 Mechanical Environment and Knee OA 257 Figure 1. The odds of medial progression conferred by varus alignment are presented for 2 reference groups: nonvarus knees and neutral/mild valgus knees (i.e., neutral or 2 valgus). The unadjusted odds ratio (OR) for varus versus nonvarus (referent) was 5.00, 95% confidence interval (95% CI) ; and for varus versus neutral/mild valgus (referent) 3.54, 95% CI The adjusted (for age, sex, and body mass index [BMI]) OR for varus versus nonvarus was 4.09, 95% CI , and for varus versus neutral/mild valgus 2.98, 95% CI Knees with grade 3 (most severe grade) joint space narrowing in either the medial or lateral compartment at baseline were excluded. The number for analysis involving the first reference group was 381 knees. The number for analysis involving the second reference group was 281 knees. varus versus nonvarus; varus versus neutral/mild valgus. (varus in degrees as a positive value, neutral 0, and valgus in degrees as a negative value) and magnitude of decrease in medial joint space width (from baseline to 18 months on semiflexed, fluoro-confirmed knee radiographs corrected for magnification error), each as a continuous variable, was examined in the dominant knee of each subject using linear regression. Severity of varus alignment correlated with the magnitude of loss of medial joint space width (R 0.52, P ). Similarly, the relationship between baseline valgus alignment and magnitude of decrease in lateral joint space width was examined. Severity of valgus alignment correlated with the magnitude of loss in lateral joint space width (R 0.35, P ). These relationships persisted in analyses adjusted for age, sex, and BMI. Second, the relationship between baseline alignment and compartment-specific progression, defined as a 1 grade increase in grade of severity of joint space narrowing was examined. Odds ratios were calculated using logistic regression and generalized estimating equations methodology to include data from one or both knees of each subject. As shown in Figure 1, varus versus nonvarus at baseline was associated with a 4-fold increase in the odds of medial progression after adjusting for age, sex, and BMI. In calculating risk in varus versus nonvarus knees, we recognized that medial OA may be associated with varus, valgus, or neutral alignment. Therefore, the risk associated with varus alignment was compared with the risk conferred by any other possible alignment for a given knee. To determine the progression risk associated with varus alignment when the comparison group had neutral or nearly neutral knees, we repeated the analysis with a referent group consisting of neutral (0 ) or mildly valgus ( 2 ) knees. Varus alignment was still associated with a 3-fold increase in risk of medial progression in adjusted analyses (Figure 1). Valgus versus nonvalgus (referent) alignment at baseline was associated with an almost 4-fold increase in the odds of lateral progression during the subsequent 18 months (Figure 2). This relationship persisted after adjustment for age, sex, and BMI. When the referent group had neutral or nearly neutral ( 2 varus) knees, valgus alignment was associated with a more than 3-fold increase in the odds of subsequent lateral OA progression (Figure 2). It is likely that malalignment and OA progression are in a vicious cycle. The results of this study support the concept that, whether a given alignment precedes or results from OA disease, malalignment may contribute to subsequent progression. The burden of malalignment at baseline also predicted deterioration in physical function between baseline and 18 months (18). Subjects were classified into 1 of 3 groups, i.e., subjects who had no knees with alignment 5 ; 1 knee with alignment 5 ; both knees with alignment 5. Physical functional outcome was analyzed as a continuous variable, i.e., baseline to 18 month change in chair stand rate (time required to complete 5 chair stands, converted to a rate or number of stands per minute). As shown in Table 1, change did not differ between the first 2 groups. However, a significantly greater deterioration in chair stand performance was found in subjects having both knees versus no knees with alignment 5. The difference between these groups persisted after adjusting for age, sex, BMI, and pain. We also explored the relationship between burden of malalignment and functional decline, designating decline as 20% worsening in rate of chair stand performance. Thirty-four subjects (16% of the 215 subjects able to perform the test at baseline) experienced functional decline Figure 2. The odds of lateral progression conferred by valgus alignment are presented for 2 reference groups: nonvalgus knees and neutral/mild varus knees (i.e., neutral or 2 varus). The unadjusted odds ratio (OR) for valgus versus nonvalgus (referent) was 3.88, 95% confidence interval (95% CI) ; and for valgus versus neutral/mild varus (referent) 3.23, 95% CI The adjusted (for age, sex, and body mass index [BMI]) OR for valgus versus nonvalgus was 4.89, 95% CI ; and for valgus versus neutral/mild varus 3.42, 95% CI Knees with grade 3 (most severe grade) joint space narrowing in either the medial or lateral compartment at baseline were excluded. The number for analysis involving the first reference group was 381 knees. The number for analysis involving the second reference group was 278 knees. valgus versus nonvalgus; valgus versus neutral/mild varus.
4 258 Sharma Table 1. Alignment group differences in the baseline to 18-month change in chair stand performance* Difference between groups (95% CI) Groups based on malalignment burden Unadjusted Adjusted for age, sex, and BMI Adjusted for age, sex, BMI, and pain One knee 5 versus no knee ( 1.40, 2.36) 0.43 ( 1.44, 2.31) 0.17 ( 1.66, 2.01) Two knees 5 versus no knee (0.75, 5.01) 2.73 (0.52, 4.94) 2.23 (0.05, 4.41) * 95% confidence interval (95% CI) that excludes 0 represents a significant difference between groups. Subjects with 2 knees with alignment 5 had significantly greater deterioration in chair stand rate between baseline and 18 months versus subjects with 0 knees with alignment 5, in unadjusted and adjusted analyses. BMI body mass index. by this definition. The proportion of subjects experiencing decline steadily rose as the burden of malalignment increased from none to 1 to 2 knees. The odds of functional decline were doubled (OR 2.33, 95% CI ) by having one knee with alignment 5 versus no knee with alignment 5, and were tripled by having both knees with alignment 5 versus no knee with alignment 5 (OR 3.22, 95% CI ). In summary, there is biomechanical evidence that alignment influences load distribution and longitudinal evidence that this biomechanical effect is clinically relevant in knee OA structural and functional outcome. Examining exercise interventions according to knee laxity. Stability is an important component of the mechanical environment of any joint. Knee laxity may be broadly defined as abnormal displacement or rotation of the tibia with respect to the femur (19). In the unloaded state, knee stability is provided by the ligaments, capsule, and other soft tissues, and in the loaded state by interactions between these tissues, condylar geometry, and contact forces generated by muscle activity and gravitational forces (19). Dynamic stability also depends upon proprioceptive input and reflex and centrally driven muscle activity (20). During normal motion, ligament stiffness is low. In the setting of large forces, soft tissue stiffness increases to limit displacement between the femur and tibia, protecting cartilage and other tissues from injury (21). As clinically assessed, joint laxity represents an impairment for which muscle activity may or may not be able to compensate. Laxity results in more abrupt joint motion with larger displacements. Deleterious effects of laxity include alteration of the congruence and regions of contact of the opposing articular surfaces, and an increase in shear and compression forces on some regions of the articular cartilage (22). Bruns et al demonstrated that ligament division in cadaver knees resulted in further increases in peak articular pressure, even in the presence of severe malalignment (9). Such alterations in pressure may lead to cartilage damage, lessening the subsequent ability of cartilage to withstand stress (21). In individuals without arthritis, frontal plane or varusvalgus laxity may reflect primary capsuloligamentous laxity (related to genetic factors or aging-related soft tissue changes) or prior injury. In knees with moderate to severe OA, laxity may be due to loss of cartilage and/or bone height, chronic capsuloligamentous stretch, or combinations of ligamentous, meniscal, muscular, and capsular pathology. The ligaments and the menisci of the OA knee develop fraying and cracking similar to what is seen in articular cartilage (23). The paucity of clinical information on varus-valgus laxity in knee OA relates in part to the absence of measurement systems. In clinical settings, varus-valgus laxity is most commonly assessed by physical exam, an unreliable approach (24,25). Sources of variation during the physical exam test have been identified as inadequate immobilization of the thigh and ankle, incomplete muscle relaxation, variation of the knee flexion angle, variation of load applied, and imprecise measures of rotation with load application (24 26). Devices to measure anterior-posterior (AP) laxity are commercially available. Aging is associated with alterations in ligament properties. Ligament stiffness and ultimate load decreased substantially with specimen age in a study of human femuranterior cruciate ligament (ACL)-tibia complex involving 3 groups, i.e., younger (22 35 years), middle (40 50 years), and older (60 97 years) (28). Ultimate load was more than 300% higher in the younger group than in the older group. In subjects without clinical or radiographic evidence of OA, a modest correlation between varus-valgus laxity and age has been described (27). Such age-related changes may be intensified by anatomic factors, by patterns of use, and by comorbid conditions. The knee injury literature provides some evidence of the clinical importance of laxity. OA develops in a canine model by inducing an unstable joint via complete ACL transection. Lundberg and Messner found that while the majority of those with isolated medial collateral ligament (MCL) injuries (grades I II) did not develop OA by 10 years, combined injury to the MCL and the ACL led to OA in close to 50% of patients (29). Kannus reported that 50% of those with a grade III sprain of the lateral collateral ligament developed OA within 8 years of injury, and that 63% of those with grade III sprains of the MCL developed OA within 9 years (30,31). Attention to concomitant injury to tissues other than ligaments varies between injury studies. There is evidence that a portion of the varus-valgus laxity present in OA knees predates the development of full-blown disease. In support of this concept, we found that varus-valgus laxity was greater in subjects with knee OA even in their uninvolved knee or their mildly involved knee than in older subjects without any clinical or radiographic evidence of knee OA (27). These differ-
5 Mechanical Environment and Knee OA 259 ences persisted after adjusting for age and sex. Although Brage et al did not statistically compare the knees with mild OA with the knees of older control subjects, mildly arthritic knees in their study appear to be more lax than the knees of the control subjects (32). Although some portion of the varus-valgus laxity of idiopathic OA appears to predate the development of fullblown disease, specific aspects of the disease itself exacerbate the problem. Varus-valgus laxity increased as joint space decreased, and was greater in knees with evidence of bony attrition (27). This is presumably related to the points of ligamentous attachment to the femur and tibia moving closer together as a result of loss of bone and cartilage height. It is likely that osteophytes prevent laxity to some extent, as demonstrated by Pottenger et al, who measured varus-valgus laxity before and after intraoperative osteophyte removal in patients with advanced knee OA (33). Given their findings, it is possible that, at earlier stages of OA, osteophytes make some contribution to varus-valgus stability. With progressive disease, loss of cartilage and bone height appear to override this stabilizing effect. At advanced stages, although osteophytes continue to have some stabilizing activity, they cannot prevent further increases in varus-valgus laxity. The opposing effects of specific features of OA on varus-valgus laxity may have contributed to the mixed results seen when studies have relied on global radiographic assessment of OA status. Using a KT1000 arthrometer, no relationship between AP laxity and age or sex in subjects without OA was detected (27). The AP laxity did not differ between subjects with OA and controls, and was not associated with specific features or global grade of OA severity. In studies using the Genucom computerized measurement system, AP laxity declined with increasing severity of OA. In one study including arthroscopic examination, the decline in AP translation was noted in spite of the fact that among those with severe OA, ACLs were absent or torn in the majority of subjects (34). The ACL type did not predict AP translation. Joint stiffness due to capsular changes or osteophytic growth may override the cruciate ligament insufficiency that can occur in progressive knee OA. We have found that varus-valgus laxity, i.e., the sum of right and left knees, was associated with physical function in cross-sectional analyses (35). Physical function was worse in subjects with high laxity (Western Ontario and McMaster Universities Osteoarthritis Index physical function score ) than low laxity ( ; P 0.008). There is evidence that varus-valgus laxity may mediate in the relationship between muscle strength and physical functioning in patients with knee OA (35). Laxity necessitates that greater muscular work be directed toward joint stabilization. We found that greater laxity was consistently associated with a weaker relationship between strength (quadriceps or hamstring) and physical function (self reported or observed). These results raise the possibility that muscle strengthening may have less impact on physical function in high laxity than low laxity knees, and that addressing varus-valgus laxity may improve the outcome of strengthening intervention. In summary, there is biomechanical evidence and crosssectional clinical evidence that varus-valgus laxity is a key local factor in the course of knee OA. Conclusions Knees with OA are heterogeneous in terms of the local mechanical environment. Differences in the local environment explain, in part, interindividual variation in the rate of OA disease progression. The same exercise program may have a dissimilar effect on different knee subsets based upon local environment. Malalignment and laxity are local factors to consider in the derivation of subsets of OA knees. These factors are suggested as a first step; the list of relevant mechanical factors to apply toward developing subsets will extend beyond the factors described here. There is evidence that alignment influences load distribution at the knee, is a determinant of surgical outcomes, increases the risk of natural progression of knee OA in the expected compartment-specific fashion, and increases the risk of functional decline in persons with knee OA. There is evidence that varus-valgus laxity has deleterious biomechanical effects that may lead to cartilage damage, increases with age, is associated with a greater risk of OA in the setting of ligament injury, is present in OA patients to some extent before full-blown disease, is made worse by specific aspects of OA disease, is associated with worse physical function, and alters the strength/function relationship. The effect of exercise or physical activity may differ between knees that are malaligned versus closer to neutral in alignment, between lax versus more stable knees. Malalignment and laxity may reduce the impact of generic exercise programs on functional outcome, and may change the effect of exercise on structural outcome. These findings point to areas for future research. A profile of key local mechanical factors for each joint site should be identified. In exercise trials of knee OA, investigators should consider stratifying results according to alignment (if feasible considering both direction and severity of malalignment) and varus-valgus laxity, as well as other key mechanical factors. Certain knee subsets (e.g., malaligned knees or lax knees) are likely to benefit from a more tailored approach; exercise interventions should be developed for these subsets. Exercise trials should strive to include structure and disability outcomes. Interventions (e.g., orthotics) directed towards laxity- and malalignment-associated stresses on the knee should be further developed and studied. Methods to assess laxity and alignment in clinical settings should be developed. REFERENCES 1. Meulenbelt I, Bijkerk C, de Wildt SCM, Miedema HS, Valkenburg HA, Breedveld FC, et al. Investigation of the association of the CRTM and CRTL-1 genes with radiographically evident osteoarthritis in subjects from the Rotterdam study. Arthritis Rheum 1997;40: Lawrence RC, Helmick CG, Arnett FC, Deyo RA, Felson DT, Giannini EH, et al. Estimates of the prevalence of arthritis and selected musculoskeletal disorders in the United States. Arthritis Rheum 1998;41: Guccione AA, Felson DT, Anderson JJ, Anthony JM, Zhang Y,
6 260 Sharma Wilson PWF, et al. The effects of specific medical conditions on the functional limitations of elders in the Framingham Study. Am J Public Health 1994;84: Ettinger WH, Davis MA, Neuhaus JM, Mallon KP. Long-term physical functioning in persons with knee osteoarthritis from NHANES I: effects of comorbid medical conditions. J Clin Epidemiol 1994;47: Buckwalter JA, Lane NE. Current concepts: athletics and osteoarthritis. Am J Sports Med 1997;25: Sharma L. Physical activity and injury and their relationship with knee osteoarthritis in epidemiologic studies. In: Garret W, Lester G, McGowan J, Kirkendahl D, editors. Women s health in sports and exercise. Rosemont (IL): American Academy of Orthopedic Surgeons; Tetsworth K, Paley D. Malalignment and degenerative arthropathy. Orthop Clin North Am 1994;25: McKellop HA, Llinas A, Sarmiento A. Effects of tibial malalignment on the knee and ankle. Orthop Clin North Am 1994;25: Bruns J, Volkmer, M, Luessenhop S. Pressure distribution at the knee joint: influence of varus and valgus deviation without and with ligament dissection. Arch Orthop Trauma Surg 1993;133: Wada M, Maezawa Y, Baba H, Shimada S, Sasaki S, Nose Y. Relationships among bone mineral densities, static alignment, and dynamic load in patients with medial compartment knee osteoarthritis. Rheumatology 2001;40: Andriacchi TP. Dynamics of knee malalignment. Orthop Clin North Am 1994;25: Schipplein OD, Andriacchi TP: Interaction between active and passive knee stabilizers during level walking. J Orthop Res 1991;9: Hsu RWW, Himeno S, Conventry MB, Chao EYS. Normal axial alignment of the lower extremity and load-bearing distribution at the knee. Clin Orthop 1990;255: Johnson F, Leitl S, Waugh W. The distribution of load across the knee: a comparison of static and dynamic measurements. J Bone Joint Surg Br 1980:62B: Harrington IJ. Static and dynamic loading patterns in knee joints with deformities. J Bone Joint Surg Am 1983;65A: Schouten JSAG, van den Ouweland FA, Valkenburg HA. A 12 year follow up study in the general population on prognostic factors of cartilage loss in osteoarthritis of the knee. Ann Rheum Dis 1992;51: Miller R, Kettelkamp DB, Laubenthal KN, Karagiorgos A, Smidt GL. Quantitative correlations in degenerative arthritis of the knee. J Bone Joint Surg Am 1973;55A: Sharma L, Song J, Felson DT, Cahue S, Shamiyeh E, Dunlop DD. The role of knee alignment in disease progression and functional decline in knee osteoarthritis. JAMA 2001;286: Markolf KL, Bargar WL, Shoemaker SC, Amstutz HC. The role of joint load in knee stability. J Bone Joint Surg Am 1981;63A: Solomonow M, D Ambrosia R. Neural reflex arcs and muscle control of knee stability and motion. In: Scott WN, editor. The knee. St. Louis (MO): Mosby; Woo SL-Y, Fenwick JA, Kanamori A, Gil JE, Saw SSC, Vogrin TM. Biomechanical considerations of joint function. In: Moskowitz RM, Howell DS, Altman RD, Buckwalter JA, Goldberg VM, editors. Osteoarthritis: diagnosis and medical/surgical management. Philadelphia: W.B. Saunders; Buckwalter JA, Lane NE, Gordon SL. Exercise as a cause of osteoarthritis. In: Kuettner KE, Goldberg VM, editors. Osteoarthritic disorders. Rosemont (IL): American Academy of Orthopedic Surgeons; p Hough AJ. Pathology of osteoarthritis. In: Moskowitz RM, Howell DS, Altman RD, Buckwalter JA, Goldberg VM, editors. Osteoarthritis: diagnosis and medical/surgical management. Philadelphia: W.B. Saunders; Cushnaghan J, Cooper C, Dieppe P, Kirwan J, McAlindon T, McCrae F. Clinical assessment of osteoarthritis of the knee. Ann Rheum Dis 1990;49: Noyes FR, Cummings JF, Grood ES, Walz-Hasselfeld KA, Wroble RR. The diagnosis of knee motion limits, subluxations, and ligament injury. Am J Sports Med 1991;19: Markolf KL, Graff-Radford A, Amstutz HC. In vivo knee stability, a quantitative assessment using an instrumented clinical testing apparatus. J Bone Joint Surg Am 1978;60A: Sharma L, Lou C, Felson DT, Dunlop DD, Kirwan-Mellis G, Hayes KW, et al. Laxity in healthy and osteoarthritic knees. Arthritis Rheum 1999;42: Woo SL, Hollis JM, Adams DJ, Lyon RM, Takai S. Tensile properties of the human femur-anterior cruciate ligamenttibia complex: the effects of specimen age and orientation. Am J Sports Med 1991;19: Lundberg M, Messner K. Ten-year prognosis of isolated and combined medial collateral ligament ruptures. Am J Sports Med 1997;25: Kannus P. Nonoperative treatment of grade II and III sprains of the lateral ligament compartment of the knee. Am J Sports Med 1989;17: Kannus P. Long-term results of conservatively treated medial collateral ligament injuries of the knee joint. Clin Orthop 1988;226: Brage ME, Draganich LF, Pottenger LA, Curran JJ. Knee laxity in symptomatic osteoarthritis. Clin Orthop 1994;304: Pottenger LA, Phillips FM, Draganich LF. The effect of marginal osteophytes on reduction of varus-valgus instability in osteoarthritic knees. Arthritis Rheum 1990;33: Wada M, Imura S, Baba H, Shimada S. Knee laxity in patients with osteoarthritis and rheumatoid arthritis. Br J Rheumatol 1996;35: Sharma L, Hayes KW, Felson DT, Buchanan TS, Kirwan- Mellis G, Lou C, et al. Does laxity alter the relationship between strength and physical function in knee osteoarthritis? Arthritis Rheum 1999;42:25 32.
TWELVE PERCENT OF THE US
ORIGINAL CONTRIBUTION The Role of Knee Alignment in Disease Progression and Functional Decline in Knee Osteoarthritis Leena Sharma, MD Jing Song, MS David T. Felson, MD, MPH September Cahue, BS Eli Shamiyeh,
More informationLAXITY IN HEALTHY AND OSTEOARTHRITIC KNEES
ARTHRITIS & RHEUMATISM Vol. 42, No. 5, May 1999, pp 861 870 1999, American College of Rheumatology 861 LAXITY IN HEALTHY AND OSTEOARTHRITIC KNEES LEENA SHARMA, CONGRONG LOU, DAVID T. FELSON, DOROTHY D.
More informationThrust During Ambulation and the Progression of Knee Osteoarthritis
ARTHRITIS & RHEUMATISM Vol. 50, No. 12, December 2004, pp 3897 3903 DOI 10.1002/art.20657 2004, American College of Rheumatology Thrust During Ambulation and the Progression of Knee Osteoarthritis Alison
More informationTHE ASSOCIATION BETWEEN VARUS VALGUS ALIGNMENT AND PATELLOFEMORAL OSTEOARTHRITIS
1874 ARTHRITIS & RHEUMATISM Vol. 43, No. 8, August 2000, pp 1874 1880 2000, American College of Rheumatology THE ASSOCIATION BETWEEN VARUS VALGUS ALIGNMENT AND PATELLOFEMORAL OSTEOARTHRITIS SADAF ELAHI,
More informationMultiapical Deformities p. 97 Osteotomy Concepts and Frontal Plane Realignment p. 99 Angulation Correction Axis (ACA) p. 99 Bisector Lines p.
Normal Lower Limb Alignment and Joint Orientation p. 1 Mechanical and Anatomic Bone Axes p. 1 Joint Center Points p. 5 Joint Orientation Lines p. 5 Ankle p. 5 Knee p. 5 Hip p. 8 Joint Orientation Angles
More informationACL AND PCL INJURIES OF THE KNEE JOINT
ACL AND PCL INJURIES OF THE KNEE JOINT Dr.KN Subramanian M.Ch Orth., FRCS (Tr & Orth), CCT Orth(UK) Consultant Orthopaedic Surgeon, Special interest: Orthopaedic Sports Injury, Shoulder and Knee Surgery,
More informationTOTAL KNEE ARTHROPLASTY (TKA)
TOTAL KNEE ARTHROPLASTY (TKA) 1 Anatomy, Biomechanics, and Design 2 Femur Medial and lateral condyles Convex, asymmetric Medial larger than lateral 3 Tibia Tibial plateau Medial tibial condyle: concave
More informationBiomechanics of the Knee. Valerie Nuñez SpR Frimley Park Hospital
Biomechanics of the Knee Valerie Nuñez SpR Frimley Park Hospital Knee Biomechanics Kinematics Range of Motion Joint Motion Kinetics Knee Stabilisers Joint Forces Axes The Mechanical Stresses to which
More informationUtility of Instrumented Knee Laxity Testing in Diagnosis of Partial Anterior Cruciate Ligament Tears
Utility of Instrumented Knee Laxity Testing in Diagnosis of Partial Anterior Cruciate Ligament Tears Ata M. Kiapour, Ph.D. 1, Ali Kiapour, Ph.D. 2, Timothy E. Hewett, Ph.D. 3, Vijay K. Goel, Ph.D. 2. 1
More informationOr thopaedic Surger y
Article Are varus knees contracted? Reconciling the literature Journal of Or thopaedic Surger y Journal of Orthopaedic Surgery 25(3) 1 8 ª The Author(s) 2017 Reprints and permissions: sagepub.co.uk/journalspermissions.nav
More informationO steoarthritis (OA) of the knee is one of the major
617 EXTENDED REPORT Dynamic load at baseline can predict radiographic disease progression in medial compartment knee osteoarthritis T Miyazaki, M Wada, H Kawahara, M Sato, H Baba, S Shimada... See end
More informationACL Athletic Career. ACL Rupture - Warning Features Intensive pain Immediate swelling Locking Feel a Pop Dead leg Cannot continue to play
FIMS Ambassador Tour to Eastern Europe, 2004 Belgrade, Serbia Montenegro Acute Knee Injuries - Controversies and Challenges Professor KM Chan OBE, JP President of FIMS Belgrade ACL Athletic Career ACL
More informationA study of functional outcome after Primary Total Knee Arthroplasty in elderly patients
Original Research Article A study of functional outcome after Primary Total Knee Arthroplasty in elderly patients Ragesh Chandran 1*, Sanath K Shetty 2, Ashwin Shetty 3, Bijith Balan 1, Lawrence J Mathias
More informationVarus Thrust in Medial Knee Osteoarthritis: Quantification and Effects of Different Gait- Related Interventions Using a Single Case Study
Arthritis Care & Research Vol. 63, No. 2, February 2011, pp 293 297 DOI 10.1002/acr.20341 2011, American College of Rheumatology CASE REPORT Varus Thrust in Medial Knee Osteoarthritis: Quantification and
More informationSEVERE VARUS AND VALGUS DEFORMITIES TREATED BY TOTAL KNEE ARTHROPLASTY
SEVERE VARUS AND VALGUS DEFORMITIES TREATED BY TOTAL KNEE ARTHROPLASTY Th. KARACHALIOS, P. P. SARANGI, J. H. NEWMAN From Winford Orthopaedic Hospital, Bristol, England We report a prospective case-controlled
More informationBiomechanical Characterization of a New, Noninvasive Model of Anterior Cruciate Ligament Rupture in the Rat
Biomechanical Characterization of a New, Noninvasive Model of Anterior Cruciate Ligament Rupture in the Rat Tristan Maerz, MS Eng 1, Michael Kurdziel, MS Eng 1, Abigail Davidson, BS Eng 1, Kevin Baker,
More informationCoronal Tibiofemoral Subluxation in Knee Osteoarthritis
Coronal Tibiofemoral Subluxation in Knee Osteoarthritis Saker Khamaisy, MD 1,2 * ; Hendrik A. Zuiderbaan, MD 1 ; Meir Liebergall, MD 2; Andrew D. Pearle, MD 1 1Hospital for Special Surgery, Weill Medical
More informationFactors Affecting Radiographic Progression of Knee Osteoarthritis
IGINAL ARTICLE Factors Affecting Radiographic Progression of Knee Osteoarthritis Harry Isbagio ABSTRACT Aim: to determine factors affecting radiographic progression of knee OA. Methods: a cross sectional
More informationThe Knee. Two Joints: Tibiofemoral. Patellofemoral
Evaluating the Knee The Knee Two Joints: Tibiofemoral Patellofemoral HISTORY Remember the questions from lecture #2? Girth OBSERVATION TibioFemoral Alignment What are the consequences of faulty alignment?
More informationKey Indexing Terms: KNEE ALIGNMENT OSTEOARTHRITIS CARTILAGE VOLUME CHONDRAL DEFECTS
A Longitudinal Study of the Association Between Knee Alignment and Change in Cartilage Volume and Chondral Defects in a Largely Non-Osteoarthritic Population GUANGJU ZHAI, CHANGHAI DING, FLAVIA CICUTTINI,
More informationOsteoarthritis. Dr Anthony Feher. With special thanks to Dr. Tim Williams and Dr. Bhatia for allowing me to use some of their slides
Osteoarthritis Dr Anthony Feher With special thanks to Dr. Tim Williams and Dr. Bhatia for allowing me to use some of their slides No Financial Disclosures Number one chronic disability in the United States
More informationThe KineSpring Knee Implant System Product Information
The KineSpring Knee Implant System Product Information The Treatment Gap Increasing numbers of young, active OA patients with longer life expectancy and higher activity demands. 1 Large increase in arthroplasty
More informationPeriarticular knee osteotomy
Periarticular knee osteotomy Turnberg Building Orthopaedics 0161 206 4803 All Rights Reserved 2018. Document for issue as handout. Knee joint The knee consists of two joints which allow flexion (bending)
More informationClinical Evaluation and Imaging of the Patellofemoral Joint Common clinical syndromes
Clinical Evaluation and Imaging of the Patellofemoral Joint Common clinical syndromes A. Panagopoulos Lecturer in Orthopaedics Medical School, Patras University Objectives Anatomy of patellofemoral joint
More informationPatellofemoral Joint. Question? ANATOMY
Doug Elenz is a paid Consultant/Advisor for the Biomet Manufacturing Corporation. Doug Elenz, MD Team Orthopaedic Surgeon The University of Texas Men s Athletic Department Question? Patellofemoral Joint
More informationThis article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution
More informationKnee Injuries. PSK 4U Mr. S. Kelly North Grenville DHS. Medial Collateral Ligament Sprain
Knee Injuries PSK 4U Mr. S. Kelly North Grenville DHS Medial Collateral Ligament Sprain Result from either a direct blow from the lateral side in a medial direction or a severe outward twist Greater injury
More informationACL Rehabilitation and Return To Play
ACL Rehabilitation and Return To Play Seth Gasser, MD Director of Sports Medicine Florida Orthopaedic Institute Introduction Return to Play: the point in recovery from an injury when a person is safely
More informationThe factors which affect the cartilage thickness of ankle joint
The factors which affect the cartilage thickness of ankle joint Fei Chang, YunLong Jia, Yao Fu, HanYang Zhang, Zhuan Zhong,QuanYu Dong The Second Hospital of Jilin University, Changchun, China Declaration
More informationAnterior Cruciate Ligament (ACL) Injuries
Anterior Cruciate Ligament (ACL) Injuries Mark L. Wood, MD The anterior cruciate ligament (ACL) is one of the most commonly injured ligaments of the knee. The incidence of ACL injuries is currently estimated
More informationRehabilitation of an ACL injury in a 29 year old male with closed kinetic chain exercises: A case study
Abstract Objective: This paper will examine a rehabilitation program for a healthy 29 year old male who sustained an incomplete tear of the left ACL. Results: Following a 9 week treatment plan focusing
More informationStephen R Smith Northeast Nebraska Orthopaedics PC. Ligament Preserving Techniques in Total Knee Arthroplasty
Stephen R Smith Northeast Nebraska Orthopaedics PC Ligament Preserving Techniques in Total Knee Arthroplasty 10-15% have Fair to poor Results? Why? The complication rate is 2.567% If It happens To You
More informationW. Dilworth Cannon, M.D. Professor of Clinical Orthopaedic Surgery University of California San Francisco
Knee Pain And Injuries In Adults W. Dilworth Cannon, M.D. Professor of Clinical Orthopaedic Surgery University of California San Francisco Pain Control Overview Narcotics rarely necessary after 1 st 1-2
More informationConservative surgical treatments for osteoarthritis: A Finite Element Study
Conservative surgical treatments for osteoarthritis: A Finite Element Study Diagarajen Carpanen, BEng (Hons), Franziska Reisse, BEng(Hons), Howard Hillstrom, PhD, Kevin Cheah, FRCS, Rob Walker, PhD, Rajshree
More informationBIOMECHANICAL MECHANISMS FOR DAMAGE: RETRIEVAL ANALYSIS AND COMPUTATIONAL WEAR PREDICTIONS IN TOTAL KNEE REPLACEMENTS
Journal of Mechanics in Medicine and Biology Vol. 5, No. 3 (2005) 469 475 c World Scientific Publishing Company BIOMECHANICAL MECHANISMS FOR DAMAGE: RETRIEVAL ANALYSIS AND COMPUTATIONAL WEAR PREDICTIONS
More informationRehab Considerations: Meniscus
Rehab Considerations: Meniscus Steve Cox, PT, DPT Department of Orthopaedics School of Medicine University of Texas Health Science Center at San Antonio 1 -Anatomy/ Function/ Injuries -Treatment Options
More information5/13/2016. ACL I Risk Factors AAP Position Statement. Anterior Cruciate Ligament Injuries: Diagnosis, Treatment and Prevention.
ACL I Risk Factors AAP Position Statement Timothy E. Hewett, PhD 2016 Chicago Sports Medicine Symposium Chicago, Illinois August 5-7, 2016 2015 MFMER slide-1 Anterior Cruciate Ligament Injuries: Diagnosis,
More informationLife. Uncompromised. The KineSpring Knee Implant System Surgeon Handout
Life Uncompromised The KineSpring Knee Implant System Surgeon Handout 2 Patient Selection Criteria Patient Selection Criteria Medial compartment degeneration must be confirmed radiographically or arthroscopically
More informationInvestigating the loading behaviour of intact and meniscectomy knee joints and the impact on surgical decisions
Investigating the loading behaviour of intact and meniscectomy knee joints and the impact on surgical decisions M. S. Yeoman 1 1. Continuum Blue Limited, One Caspian Point, Caspian Way, CF10 4DQ, United
More informationKnee Capsular Disorder. ICD-9-CM: Stiffness in joint of lower leg, not elsewhere classified
1 Knee Capsular Disorder "Knee Capsulitis" ICD-9-CM: 719.56 Stiffness in joint of lower leg, not elsewhere classified Diagnostic Criteria History: Physical Exam: Stiffness Aching with prolonged weight
More informationRelationship of Meniscal Damage, Meniscal Extrusion, Malalignment, and Joint Laxity to Subsequent Cartilage Loss in Osteoarthritic Knees
ARTHRITIS & RHEUMATISM Vol. 58, No. 6, June 2008, pp 1716 1726 DOI 10.1002/art.23462 2008, American College of Rheumatology Relationship of Meniscal Damage, Meniscal Extrusion, Malalignment, and Joint
More informationIntertester Reliability of Clinical Judgments of Medial Knee Ligament Integrity
Intertester Reliability of Clinical Judgments of Medial Knee Ligament Integrity The purpose of this study was to determine the intertester reliability of judgments based on tibiofemoral joint abduction
More informationPRE & POST OPERATIVE RADIOLOGICAL ASSESSMENT IN TOTAL KNEE REPLACEMENT. Dr. Divya Rani K 2 nd Year Resident Dept. of Radiology
PRE & POST OPERATIVE RADIOLOGICAL ASSESSMENT IN TOTAL KNEE REPLACEMENT Dr. Divya Rani K 2 nd Year Resident Dept. of Radiology PRE OPERATIVE ASSESSMENT RADIOGRAPHS Radiographs are used for assessment and
More informationSOFT TISSUE KNEE INJURIES
SOFT TISSUE KNEE INJURIES Soft tissue injuries of the knee commonly occur in all sports or in any activity that requires sudden changes in activity or movement. The knee is a complex joint and any injury
More informationAnterior Cruciate Ligament Surgery
Anatomy Anterior Cruciate Ligament Surgery Roger Ostrander, MD Andrews Institute Anatomy Anatomy Function Primary restraint to anterior tibial translation Secondary restraint to internal tibial rotation
More informationFemoral intercondylar notch measurements in osteoarthritic knees
Rheumatology 1999;38:554 558 Femoral intercondylar notch measurements in osteoarthritic knees M. Wada, H. Tatsuo, H. Baba, K. Asamoto1 and Y. Nojyo1 Departments of Orthopaedic Surgery and 1Anatomy, Fukui
More informationPhysical Functioning Over Three Years in Knee Osteoarthritis
ARTHRITIS & RHEUMATISM Vol. 48, No. 12, December 2003, pp 3359 3370 DOI 10.1002/art.11420 2003, American College of Rheumatology Physical Functioning Over Three Years in Knee Osteoarthritis Role of Psychosocial,
More informationRadiographic Osteoarthritis and Serum Triglycerides
Bahrain Medical Bulletin, Vol. 25, No. 2, June 2003 Radiographic Osteoarthritis and Serum Triglycerides Abdurhman S Al-Arfaj, FRCPC, MRCP(UK), FACP, FACR* Objectives: In view of the many studies linking
More informationReduction of Medial Compartment Loads with Valgus Bracing of the Osteoarthritic Knee
0363-5465/102/3030-0414$02.00/0 THE AMERICAN JOURNAL OF SPORTS MEDICINE, Vol. 30, No. 3 2002 American Orthopaedic Society for Sports Medicine Reduction of Medial Compartment Loads with Valgus Bracing of
More informationKnee Joint Assessment and General View
Knee Joint Assessment and General View Done by; Mshari S. Alghadier BSc Physical Therapy RHPT 366 m.alghadier@sau.edu.sa http://faculty.sau.edu.sa/m.alghadier/ Functional anatomy The knee is the largest
More informationOsteoarthritis of the Hip
Osteoarthritis of the Hip Information on hip osteoarthritis is also available in Spanish: Osteoartritis de cadera (topic.cfm?topic=a00608). Sometimes called "wear and tear" arthritis, osteoarthritis is
More informationMassive Varus- Overview. Massive Varus- Classification. Massive Varus- Definition 07/02/14. Correction of Massive Varus Deformity in TKR
07/02/14 Massive Varus- Overview Correction of Massive Varus Deformity in TKR Myles Coolican Val d Isere 2014 Massive Varus- Classification Classification Intra articular Massive Varus- Classification Classification
More informationArthrosis of the knee in chronic anterior laxity
Orthopaedics & Traumatology: Surgery & Research 100 (2014) 49 58 Available online at ScienceDirect www.sciencedirect.com Special Vol. 100 Arthrosis of the knee in chronic anterior laxity H. Dejour, G.
More informationHip and Knee Frontal Plane Biomechanics in People with Medial Compartment Knee Osteoarthritis
Hip and Knee Frontal Plane Biomechanics in People with Medial Compartment Knee Osteoarthritis by Latif Khoja A thesis submitted to the School of Rehabilitation Therapy In conformity with the requirements
More informationV-VAS ORTHOSIS: A NEW CONCEPT IN UNLOADER KNEE ORTHOSIS DESIGN
V-VAS ORTHOSIS: A NEW CONCEPT IN UNLOADER KNEE ORTHOSIS DESIGN Joseph W. Whiteside CO/LO 1399 E. Western Reserve Road, Poland, OH 44514-3250 (800) 837-3888 www.anatomicalconceptsinc.com Page 1 of 5 The
More informationA comparative assessment of alternatives to the full-leg radiograph for determining knee joint alignment
Navali et al. Sports Medicine, Arthroscopy, Rehabilitation, Therapy & Technology 2012, 4:40 RESEARCH Open Access A comparative assessment of alternatives to the full-leg radiograph for determining knee
More informationUnicompartmental Knee Resurfacing
Disclaimer This movie is an educational resource only and should not be used to manage knee pain. All decisions about the management of knee pain must be made in conjunction with your Physician or a licensed
More informationEvaluation and Management of Knee Pain. Michael Cassat, MD University of Arkansas for Medical Sciences
Evaluation and Management of Knee Pain Michael Cassat, MD University of Arkansas for Medical Sciences Disclosure I have no actual or potential conflict of interest in relation to this program/presentation.
More informationImaging assessment of Unicomp candidates!
7th Advanced Course on Knee Surgery - 2018: Imaging assessment of Unicomp candidates! Presenter: Anders Troelsen, MD, ph.d., dr.med., Professor Distribution of the basic primary OA patterns Medial FT:
More informationAnterior Cruciate Ligament Injuries
Anterior Cruciate Ligament Injuries One of the most common knee injuries is an anterior cruciate ligament sprain or tear.athletes who participate in high demand sports like soccer, football, and basketball
More informationThis presentation is the intellectual property of the author. Contact them for permission to reprint and/or distribute.
43 rd Annual Symposium on Sports Medicine UT Health Science Center San Antonio School of Medicine January 22-23, 2016 Intra-articular / Extra-synovial 38 mm length / 13 mm width Fan-shaped structure narrowest-midportion
More informationThe causes of OA of the knee are multiple and include aging (wear and tear), obesity, and previous knee trauma or surgery. OA affects usually the
The Arthritic Knee The causes of OA of the knee are multiple and include aging (wear and tear), obesity, and previous knee trauma or surgery. OA affects usually the medial compartment of the knee, and
More informationBiomechanics of. Knee Replacement. Mujda Hakime, Paul Malcolm
Biomechanics of Knee Replacement Mujda Hakime, Paul Malcolm 1 Table of contents Knee Anatomy Movements of the Knee Knee conditions leading to knee replacement Materials Alignment and Joint Loading Knee
More informationAnteroposterior tibiofemoral displacements during isometric extension efforts The roles of external load and knee flexion angle
winner of the rehabilitation award Anteroposterior tibiofemoral displacements during isometric extension efforts The roles of external load and knee flexion angle KENNETH A. JURIST, MD, AND JAMES C. OTIS,*
More informationKnee Injury Assessment
Knee Injury Assessment Clinical Anatomy p. 186 Femur Medial condyle Lateral condyle Femoral trochlea Tibia Intercondylar notch Tibial tuberosity Tibial plateau Fibula Fibular head Patella Clinical Anatomy
More informationPatellofemoral Instability
Disclaimer This movie is an educational resource only and should not be used to manage Patellofemoral Instability. All decisions about the management of Patellofemoral Instability must be made in conjunction
More informationRoy H. Lidtke Assistant Professor of Internal Medicine, Section of Rheumatology Rush University Medical Center, Chicago, Illinois
Roy H. Lidtke Assistant Professor of Internal Medicine, Section of Rheumatology Rush University Medical Center, Chicago, Illinois Osteoarthritis (OA) is the most common form of lower extremity arthritis
More informationMedical Diagnosis for Michael s Knee
Medical Diagnosis for Michael s Knee Introduction The following report mainly concerns the diagnosis and treatment of the patient, Michael. Given that Michael s clinical problem surrounds an injury about
More informationWhat is the most effective MRI specific findings for lateral meniscus posterior root tear in ACL injuries
What is the most effective MRI specific findings for lateral meniscus posterior root tear in ACL injuries Kazuki Asai 1), Junsuke Nakase 1), Kengo Shimozaki 1), Kazu Toyooka 1), Hiroyuki Tsuchiya 1) 1)
More informationMedical Practice for Sports Injuries and Disorders of the Knee
Sports-Related Injuries and Disorders Medical Practice for Sports Injuries and Disorders of the Knee JMAJ 48(1): 20 24, 2005 Hirotsugu MURATSU*, Masahiro KUROSAKA**, Tetsuji YAMAMOTO***, and Shinichi YOSHIDA****
More informationOsteoarthritis of the Hip
Page 1 of 8 Osteoarthritis of the Hip Information on hip osteoarthritis is also available in Spanish: Osteoartritis de cadera (topic.cfm?topic=a00608). Sometimes called "wear-and-tear" arthritis, osteoarthritis
More informationSpecialists in Joint Replacement, Spinal Surgery, Orthopaedics and Sport Injuries. Cartilage Surgery. The Knee.
Specialists in Joint Replacement, Spinal Surgery, Orthopaedics and Sport Injuries Cartilage Surgery The Knee CARTILAGE INJURY Treatment of cartilage injury remains one of the most significant challenges
More informationKnee Dislocation: Spectrum of Injury, Evolution of Treatment & Modern Outcomes
Knee Dislocation: Spectrum of Injury, Evolution of Treatment & Modern Outcomes William M Weiss, MD MSc FRCSC Orthopedic Surgery & Rehabilitation Sports Medicine, Arthroscopy & Extremity Reconstruction
More informationTHE EFFECT OF THE FRONTAL PLANE TIBIOFEMORAL ANGLE ON THE CONTACT STRESS AND STRAIN AT THE KNEE JOINT. A Dissertation Presented. Nicholas Hartley Yang
THE EFFECT OF THE FRONTAL PLANE TIBIOFEMORAL ANGLE ON THE CONTACT STRESS AND STRAIN AT THE KNEE JOINT A Dissertation Presented by Nicholas Hartley Yang to The Department of Mechanical and Industrial Engineering
More informationInternational Cartilage Repair Society
OsteoArthritis and Cartilage (2007) 15, 932e936 ª 2007 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved. doi:10.1016/j.joca.2007.02.004 The lateral wedged insole
More informationExam of the Knee and Ankle I HAVE NO FINANCIAL DISCLOSURES RELEVANT TO THIS PRESENTATION
Exam of the Knee and Ankle I HAVE NO FINANCIAL DISCLOSURES RELEVANT TO THIS PRESENTATION Disclosures I have no relevant financial relationships with the manufacturers of any commercial products and or
More informationACL Forces and Knee Kinematics Produced by Axial Tibial Compression During a Passive Flexion Extension Cycle
ACL Forces and Knee Kinematics Produced by Axial Tibial Compression During a Passive Flexion Extension Cycle Keith L. Markolf, Steven R. Jackson, Brock Foster, David R. McAllister Biomechanics Research
More informationKinematics Analysis of Different Types of Prosthesis in Total Knee Arthroplasty with a Navigation System
Showa Univ J Med Sci 29 3, 289 296, September 2017 Original Kinematics Analysis of Different Types of Prosthesis in Total Knee Arthroplasty with a Navigation System Hiroshi TAKAGI 1 2, Soshi ASAI 1, Atsushi
More informationThe coronal hypomochlion
KNEE The coronal hypomochlion A TIPPING POINT OF CLINICAL RELEVANCE WHEN PLANNING VALGUS PRODUCING HIGH TIBIAL OSTEOTOMIES E. Heijens, P. Kornherr, C. Meister From Gelenkzentrum Rhein-Main, Wiesbaden,
More informationTable of Contents. Overview Introduction Variables Missing Data Image Type Time Points Reading Methods...
MULTICENTER OSTEOARTHRITIS STUDY LONGITUDINAL KNEE RADIOGRAPH ASSESSMENTS (BASELINE TO 15-MONTH, 30-MONTH, 60-MONTH AND 84-MONTH FOLLOW-UP) AND MEASUREMENTS FROM BASELINE FULL LIMB RADIOGRAPHS DATASET
More informationEvaluation and Treatment of Knee Arthritis Classification of Knee Arthritis Osteoarthritis Osteoarthritis Osteoarthritis of Knee
1 2 Evaluation and Treatment of Knee Arthritis John Zebrack, MD Reno Orthopaedic Clinic Classification of Knee Arthritis Non-inflammatory Osteoarthritis Primary Secondary Post-traumatic, dysplasia, neuropathic,
More informationHuman ACL reconstruction
Human ACL reconstruction current state of the art Rudolph Geesink MD PhD Maastricht The Netherlands Human or canine ACL repair...!? ACL anatomy... right knees! ACL double bundles... ACL double or triple
More informationDisclosures. Outline. The Posterior Cruciate Ligament 5/3/2016
The Posterior Cruciate Ligament Christopher J. Utz, MD Assistant Professor of Orthopaedic Surgery University of Cincinnati Disclosures I have no disclosures relevant to this topic. Outline 1. PCL Basic
More informationContributions of Muscles, Ligaments, and the Ground-Reaction Force to Tibiofemoral Joint Loading During Normal Gait
Contributions of Muscles, Ligaments, and the Ground-Reaction Force to Tibiofemoral Joint Loading During Normal Gait Kevin B. Shelburne, 1 Michael R. Torry, 1 Marcus G. Pandy 2,3 1 Steadman-Hawkins Research
More informationDISEASES AND DISORDERS
DISEASES AND DISORDERS 9. 53 10. Rheumatoid arthritis 59 11. Spondyloarthropathies 69 12. Connective tissue diseases 77 13. Osteoporosis and metabolic bone disease 95 14. Crystal arthropathies 103 15.
More informationLateral knee injuries
Created as a free resource by Clinical Edge Based on Physio Edge podcast episode 051 with Matt Konopinski Get your free trial of online Physio education at Orthopaedic timeframes Traditionally Orthopaedic
More informationBalanced Body Movement Principles
Balanced Body Movement Principles How the Body Works and How to Train it. Module 3: Lower Body Strength and Power Developing Strength, Endurance and Power The lower body is our primary source of strength,
More informationBiomechanical Effects of Femoral Component Axial Rotation in Total Knee Arthroplasty (TKA)
Biomechanical Effects of Femoral Component Axial Rotation in Total Knee Arthroplasty (TKA) Mohammad Kia, PhD, Timothy Wright, PhD, Michael Cross, MD, David Mayman, MD, Andrew Pearle, MD, Peter Sculco,
More informationFinancial Disclosure. Medial Collateral Ligament
Matthew Murray, M.D. UTHSCSA Sports Medicine Financial Disclosure Dr. Matthew Murray has no relevant financial relationships with commercial interests to disclose. Medial Collateral Ligament Most commonly
More informationCurrent trends in ACL Rehab. James Kelley, MDS, PT
Current trends in ACL Rehab James Kelley, MDS, PT Objectives Provide etiological information Discuss the criteria for having an ACL reconstruction Review the basic rehabilitation principles behind ACL
More informationAnterior Cruciate Ligament (ACL) Injuries
Anterior Cruciate Ligament (ACL) Injuries This article is also available in Spanish: Lesiones del ligamento cruzado anterior (topic.cfm?topic=a00697) and Portuguese: Lesões do ligamento cruzado anterior
More informationSOFT TISSUE INJURIES OF THE KNEE: Primary Care and Orthopaedic Management
SOFT TISSUE INJURIES OF THE KNEE: Primary Care and Orthopaedic Management Gauguin Gamboa Australia has always been a nation where emphasis on health and fitness has resulted in an active population engaged
More information2017 Resident Advanced Trauma Techniques Course COMPLICATIONS / CHALLENGES MALUNIONS/DEFORMITY
2017 Resident Advanced Trauma Techniques Course COMPLICATIONS / CHALLENGES MALUNIONS/DEFORMITY What is a Malunion? Definition: a fracture that has healed in a nonanatomic (i.e. deformed) position Must
More informationGeneral Concepts. Growth Around the Knee. Topics. Evaluation
General Concepts Knee Injuries in Skeletally Immature Athletes Zachary Stinson, M.D. Increased rate and ability of healing Higher strength of ligaments compared to growth plates Continued growth Children
More informationThe knee is a complex and dynamic joint that is
87 Sagittal and Coronal Biomechanics of the Knee A Rationale for Corrective Measures Harlan B. Levine, M.D., and Joseph A. Bosco III, M.D. The knee is a complex and dynamic joint that is subjected to many
More informationUnicompartmental Knee Replacement
Unicompartmental Knee Replacement Results and Techniques Alexander P. Sah, MD California Orthopaedic Association Meeting Laguna Niguel, CA May 20th, 2011 Overview Why partial knee replacement? - versus
More informationCommon Knee Injuries
Common Knee Injuries In 2010, there were roughly 10.4 million patient visits to doctors' offices because of common knee injuries such as fractures, dislocations, sprains, and ligament tears. Knee injury
More informationAnterior Cruciate Ligament (ACL)
Anterior Cruciate Ligament (ACL) The anterior cruciate ligament (ACL) is one of the 4 major ligament stabilizers of the knee. ACL tears are among the most common major knee injuries in active people of
More information1/11/2016. Disclosures. Learning Objectives. Osteoarthritis. Definition. Phenotypes. Thinking About Tomorrow:
Thinking About Tomorrow: How Athletic Trainers can Impact a Patient s Long-Term Joint Health Disclosures I have no financial affiliations that would bias this presentation. Jeffrey B. Driban, PhD, ATC,
More informationOsteotomies for Cartilage Protections. Jeffrey Halbrecht,, MD San Francisco, Ca
Osteotomies for Cartilage Protections Jeffrey Halbrecht,, MD San Francisco, Ca ACI/Osteotomy Osteotomy: Optimal Patient Selection Mechanical axis falls within involved compartment Mild joint space narrowing
More information