Reconstruction of the Ligaments of the Knee
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1 Reconstruction of the Ligaments of the Knee
2 Contents ACL reconstruction Evaluation Selection Evolution Graft issues Notchplasty Tunnel issues MCL PCL Posterolateral ligament complex Combined injuries
3 Evaluation & Imaging Clinical exam Routine xrays: AP/lateral (avulsion fxs) Special xrays: sunrise/tunnel; Rosenberg view MRI: 90% sensitive (acute ACL) Not good for partial tears (<50%) Identify associated injuries Sensitive for PCL except chronic tears
4 Who is a candidate for ACL reconstruction? Young; athlete Symptoms of instability & pain Risk of further meniscal & articular cartilage injury Presence of degenerative changes
5 Nonsurgical treatment for ACL deficiency Sedentary patients; knees with advanced degenerative changes Functional bracing Rehab: full ROM, closed kinetic chain strengthening, focus on hamstrings (quads & gastroc), proprioceptive re-ed Behavior modification
6 Evolution of ACL surgery Direct repair Extraarticular (nonanatomic) reconstruc Prosthetic replacement (40-80% failure) Repair with LAD (no better than repair) Arthroscopically assisted reconstruction Autograft Allograft
7 Autografts Graft choices Bone-patellar tendon-bone Quadrupled hamstrings (Grac & Semi-T) Quadriceps tendon Allografts Bone-patellar tendon-bone Achilles tendon Hamstrings Quadriceps tendon Fascia lata
8 Autograft vs. Allograft Viral disease transmission (1:1million) Deep freezing leaves some cells (10%) Freeze-drying & cryo weaken graft; limited self-life Graft incorporation & remodeling is faster with autografts. (graft is 8-12wks) Donor site morbidity with autografts?more creep with allografts
9 Graft selection Graft strength: patellar tendon (150% of ACL); 4-HT ( %); auto>allo,early Bone/bone vs. tendon/bone fixation & healing Hamstrings > tunnel widening Hamstring weakness- clinically not a problem Patellar tendon > anterior knee pain (10-40%); fracture risk (2%); 10% decrease in quad strength is usual
10 Graft Pros & Cons
11 The notchplasty Improves visualization of femoral tunnel & creates clearance for the graft Current trend is to minimize the plasty Minimizing decreases postop pain, swelling, bleeding, & potential regrowth. Too much may lateralize the femoral insertion & lead to abnormal kinematics. A recent study > histopathologic changes in 6mo c/w early DJD 100 pts > no short-term benefit w/ plasty
12 Tunnel placement Tibial posteromedial footprint. Femoral or 1-2 o clock. Leave 1-2mm of posterior wall.
13 Tunnel misplacement Tibial tunnel Anterior (most common)> graft impingement, loss of extension Posterior > continued pathokinematics Femoral tunnel Anterior (most common)> high strains in flexion, loss of flexion, inc graft stretching Posterior (over-the-top)> blow-out, tight in extension, inc AP laxity in flexion
14 Tunnel technique Tibial 45-55degree angle toward footprint; longer grafts (b-pt-b) may need higher angles. Femoral tunnel drilled w/ degrees of knee flexion to avoid blow-out. Intraop lateral xray
15 The graft: intraop points Preconditioning (tensioning): 20-80N Decreases up to 30% soon after fixation Excessive > restrict motion; accel arthrosis Inadequate > continued instability Fixation Type > interference screws (tit/bio), endo, transfix Technique > at joint line; avoid divergence (>15*) Rotating graft by 90deg or more increases strength by approx. 20%
16 Graft fixation Single-incision Double-incision Blunt-threaded bioabsorbable screws allow fixation at the joint line on both sides.
17 Fixing the graft Snug fit b/w graft and tunnel Underdrill & dilate-up 7mm & 9mm screws Avoid screw divergence Place femoral deg flexion Place femoral screw through tibial tunnel? of knee position Slight flexion > least AP laxity, tightest Lachman Full extension > limits risk of flexion contracture
18 Results of ACL recon. Most series show 88-95% good to excellent 3-5yr f/u. Objectively stable knees Instrumented laxity less than 3mm Pivot shift less than 1+ Subjective success in 3-5yrs Full return to preinjury activity levels w/o significant symptoms Meniscal resection & cartilage damage adversely effect results. Better rates of meniscal healing w/ ACL surg.
19 Medial Collateral Lig. Grades: medial opening in 30deg flex 1 = 1-5mm 2 = 6-10mm 3 = 11-15mm Nonsugical rx is the mainstay Bracing & crutches (b/w 2-6wks) Rehab: early quad & hamstring strength Combined injuries (post capsule,cruciate) Nonsurg & surgical rx have been recommended Higher risk of stiffness w/ proximal injuries
20 Posterior Cruciate Lig. Pt c/o pain rather than instability. Chronic (10-20yr) PCL deficiency Medial & PF compartment arthrosis Cadaver study > inc contact pressures Nonsurg rx focuses on quad strength? true isolated injuries Usually partial tears (do well) Serial bone scans > early cartilage damage? missed combined injuries (60% have posterolat complex)
21 Surgery for PCL Recommended w/in first 2 weeks Exam > 3+ posterior drawer, increased 30 & 90deg flexion 20% of athletes go on to reconstruction 2 distinct bundles > not isometric Grafts Achilles tendon allograft Patellar & quad tendon autografts Increasing interest in a 2-bundle technique Postop rehab: much less aggressive than ACL rehab.
22 Tunnel placement: PCL Anterolateral bundle is the focus of reconstruction. Larger & stronger Taut in flexion
23 Posterolateral Complex IT band, biceps femoris, LCL, fabello-fibular lig, arcuate lig, popliteus tendon, & posterolateral capsule Spectrum of injury; assoc w/ PCL & bicruciate injury c/o instability, esp. descending stairs >10% incidence of peroneal nerve injury Increased lateral comp translation & medial comp compression (inc adduction moment in varus knees)
24 Posterolateral complex surgery Direct primary repair for acute injuries avulsion fxs, ie. fibula w/in first few weeks; lateral approach address all injured structures Reconstruction for chronic injuries Traditional procedures (mixed results) Biceps tenodesis (Clancy), arcuate lig advancement Anatomic procedures (results pending) Popliteal lig. & LCL reconstruction (auto & allograft sling) HTO before reconstruction in pts w/ varus thrust
25 Results of PL complex repair/reconstruction Few reports or series Fanelli et.al. (recent retrospective study) 64% restoration of PL stability w/ arcuate complex bony recession 78% success rate w/ Achilles tendon allograft loop reconstruction of the LCL
26 Combined injuries MCL & ACL Reconstruct ACL; brace for MCL May need early MCL repair for grade 3 injuries w/ opening in full extension. Increased risk of postop stiffness MCL & PCL Grossly unstable knees Early MCL repair w/ PCL reconstruction May consider bracing x4-6wks, then PCL recon. Tibia must remain reduced in the brace.
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