Musculoskeletal Applications for CT. Tal Laor, MD Cincinnati Children s Hospital University of Cincinnati College of Medicine
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1 Musculoskeletal Applications for CT Tal Laor, MD Cincinnati Children s Hospital University of Cincinnati College of Medicine
2 I have no commercial disclosures.
3 Why CT? Complimentary to other modalities Bony morphology Small fragments Alignment Mineralization/ossification Indwelling hardware 3D reformations
4 steadyburn.net Upper Extremity lazydayandsundays.blogspot.com
5 Anterior Shoulder Instability Bone loss is a common consequence of traumatic shoulder instability Humerus, glenoid, or both Positive correlation between number of dislocations and extent/depth of bone injury Glenoid/humeral bone loss most common cause for failure after surgery
6 15 yo boy with prior anterior shoulder dislocation, continued pain
7 Anterior Shoulder Instability Humerus Hill Sachs Deformity Grooved defect of posterosuperolateral articulating humeral head 40-90% of anterior shoulder dislocations Up to 100% recurrent dislocations / *Hill HA, Sachs MD. Radiology 1940: 35;
8 Burkhart SS, Danaceau SM. Arthroscopy: Jour Arthro Rel Surg, 16:7, 2000:
9 Burkhart SS, Danaceau SM. Arthroscopy: Jour Arthro Rel Surg, 16:7, 2000:
10 Burkhart SS, Danaceau SM. Arthroscopy: Jour Arthro Rel Surg, 16:7, 2000:
11 Engaging : large enough defect with edge over glenoid rim during abduction/external rotation / * Burkhart SS, Danaceau SM. Arthroscopy: Jour Arthro Rel Surg, 16:7, 2000:
12 C
13 C
14 C 64.2 mm = mm 18.2/82.4 = 22%
15 Hill Sachs Articular Deformity arthroscopic Bankart effective variable address humerus: osteotomy, bone graft 20% 30% Natha ST, Parikh N. Helio.com/Orthopedics May 2012 e746.
16 D/Diameter Depth < 16% of humeral head diameter: arthroscopic Bankart repair * Diameter D *Hardy, unpublished data: Cho SH, et al. Am J Sports Med 2011
17 W/Diameter Mean size: 52% of axial diameter is likely to be an engaging lesion* Diameter W *Cho SH, et al. Am J Sports Med 2011
18 Anterior Shoulder Instability Glenoid Loss of glenoid concavity reduces stability Large defects require bone replacement techniques Arthroscopic versus open repair C A
19 Inverted Pear * anterior *Burkhart SS, DeBeer JF. Arthroscopy 2000
20 Inverted Pear * anterior *Burkhart SS, DeBeer JF. Arthroscopy 2000
21 Inverted Pear * anterior *Burkhart SS, DeBeer JF. Arthroscopy 2000
22 anterior
23
24 31.6 mm
25 8.1 mm
26 8.1mm/31.6mm = 25.6% Deficiency >25%: consider bone reconstruction techniques 31.6 mm 8.1 mm
27 Anterior Glenoid Deficiency Rebuild anterior-inferior buttress with bone graft Large piece of bone (2-3 cm) recreates articulating arc of glenoid Coracoid transfer or iliac crest graft
28 Latarjet* Procedure capsule C G C anterior G (Conjoined tendon of short head of biceps and coracobrachialis muscles) *Latarjet M. Lyon Chir 1954;49: Modified from Piasecki DP et al, JAAOS Aug 2009:17 (8)
29
30 1 year later after Latarjet procedure, with increasing pain
31
32
33 Scaphoid Fractures Fracture pattern may predict ability to heal MRI: purely trabecular fracturesneed shorter immobilization, more likely to heal, may miss nondisplaced cortical fractures CT: initial displacement (more likely for nonunion) and evaluate healing
34
35 1 month after pinning
36 Lower Extremities
37 Rotational Profiles Version: normal twisting of long bone on its anatomic longitudinal axis Femur: anteversion, retroversion Tibia: internal (medial), external (lateral) version Tibial tuberosity-trochlear groove (TT-TG) distance
38 Rotational Profiles Abnormalities of version In-toeing, out-toeing SCFE Coxa vara Neuromuscular disorders DDH Knee and patellar instability Osteoarthritis
39 Femoral Version
40 Femoral Version Normal: 32 anteversion at 1 yr, 16 at 16 yrs Mean difference between sides approx 8
41 Femoral Version Normal: 32 anteversion at 1 yr, 16 at 16 yrs Mean difference between sides approx 8 Incr version: in-toeing, pincer deformity Decr version: SCFE, cam deformity
42
43 axial oblique
44 axial
45 40 externally rotated 20 externally rotated = 20 anteversion
46 Tibial Version After birth, distal tibia rotates laterally (relative to proximal) = external tibial version 2-4 at birth, at skeletal maturity physioquestions.com
47 20 degrees internally rotated 50 degrees externally rotated
48 20 degrees internally rotated so, need to externally rotate 20 degrees to make proximal tibia neutral
49 Add 20 degrees external rotation to 50 degrees external rotation= 70 degrees external rotation
50 Tibial Tuberosity-Trochlear Groove (TT-TG) Lateralization of tibial tuberositypredisposes to recurrent patellar dislocation Surgery to correct lateral offset: medialization of tibial tubercle Horizontal distance normal 10mm, pathological > 20mm *
51
52
53
54 10mm normal
55
56 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization. b) An engaging lesion refers to humeral bone loss. c) The Latarjet procedure is used to reconstitute the humeral articulating surface. d) Inverted pear is a type of dessert cake.
57 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization. b) An engaging lesion refers to humeral bone loss. c) The Latarjet procedure is used to reconstitute the humeral articulating surface. d) Inverted pear is a type of dessert cake.
58 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization. b) An engaging lesion refers to humeral bone loss. c) The Latarjet procedure is used to reconstitute the humeral articulating surface. d) Inverted pear is a type of dessert cake.
59 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization. b) An engaging lesion refers to humeral bone loss. c) The Latarjet procedure is used to reconstitute the humeral articulating surface. d) Inverted pear is a type of dessert cake.
60 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization. b) An engaging lesion refers to humeral bone loss. c) The Latarjet procedure is used to reconstitute the humeral articulating surface. d) Inverted pear is a type of dessert cake.
61 Which of the following statements is false? a) Glenoid/humeral bone loss is the most common cause for failure after instability stabilization b) The Latarjet procedure is used to reconstitute the humeral articulating surface. c) An engaging lesion refers to humeral bone loss. d) Inverted pear is a type of dessert cake.
62 Thank you! 123rf.com
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