(1/3), Level 3 a combined posterior drawer and external rotation force is then applied to the knee to assess for an increase in posterolateral translation (lateral tibia externally rotates relative to lateral femoral condyle), knee positioned at 90 and external rotation and valgus force applied to tibia, as the knee is extended the tibia reduces with a palpable clunk, tibia reduces from a posterior subluxed position at ~20 of flexion to a reduced position in full extension (reduction force from IT band transitioning from a flexor to an extensor of the knee), altered sensation to dorsum of foot and weak ankle dorsiflexion, approximately 25% of patients have peroneal nerve dysfunction, may see avulsion fracture of the fibula (arcuate fracture ) or femoral condyle, side-to-side difference 2.7-4 mm = isolated LCL tear, primary varus = tibiofemoral malalignment, secondary varus = LCL deficiency with increased lateral opening, triple varus = remaining PLC deficient, overall varus recurvatum alignment, necessary to determine mechanical axis and if a, look for injury to the LCL, popliteus, and biceps tendon, coronal oblique thin-slice through the fibular head are best at visualizing the PLC structures, hinged knee brace locked in extension x4 weeks, followed by progressive functional rehabilitation, midsubstance repair have 40% failure rate following repair, repair of LCL, popliteus tendon and/or popliteofibular ligament should be performed if structures can be, anatomically reduced to their attachment site, avulsion fracture of fibular head can be treated with screws or suture anchors, avulsion injuries where repair is not possible or tissie is poor quality, goal is to reconstruct LCL and the popliteofibular ligament using a free tendon graft (semitendinosus or achilles), soft tissue graft passed through bone tunnel in fibular head, limbs are then crossed to create figure-of-eight and fixed to lateral femur to a single tunnel, trans-tibial double-bundle reconstruction, split achilles tendon is fixed to isometric point of the femoral epicondyle, one tibia-based limb and one fibula-based limb, fibula-limb is fixed to the fibular head with a bone tunnel and transosseous sutures to reconstruct the LCL, tibia-limb is brought through the posterior tibia to reconstruct the popliteofibular ligament, proximal attachment site at anatomic femoral LCL attachment, through the fibular head lateral to medial, docking into the tibial tunnel posterior to anterior with graft #2, graft #2 reconstructs the popliteus tendon, proximal attachment site at the anatomic popliteus tendon attachment, docking into the tibial tunnel posterior to anterior with graft #1, hinged knee brace, nonweightbearing for 6 weeks, range of motion protocols differ between surgeons, some advocate for passive ROM immediately 0-90, others immobilize for 2 weeks, then begin motion, at 6 weeks, begin weightbearing and closed-chain strenghtening, return to activities / sports ~ 6 to 9 months, operative treatment has improved outcomes compared to nonoperative treatment, repair has higher failure rate than reconstruction, particularly for midsubstance injuries, but also for soft tissue avulsions, anatomic reconstruction restores rotatory stability, but not all varus stability on stress testing, PLC reconstruction, +/- ACL reconstruction, +/-, acute and chronic combined ligament injuries, PLC reconstruction should be performed at same time or prior to (as staged procedure) ACL or PCL to prevent early cruciate failure, indicated in patients with varus mechanical alignment, failure to correct bony alignment jeopardizes ACL and PLC reconstruction success, ACL reconstruction + PLC repair 33% achieved IKDC grade A or B compared to 88% of patients who underwent ACL + PLC reconstruction, failure to identify a PLC injury will lead to failure of ACL or PCL reconstruction, Spontaneous Osteonecrosis of the Knee (SONK), Osgood Schlatter's Disease (Tibial Tubercle Apophysitis), Anterior Superior Iliac Spine (ASIS) Avulsion, Anterior Inferior Iliac Spine Avulsion (AIIS), Proximal Tibiofibular Joint Ganglion Cysts, Pre-Participation Physical Exam in Athlete, Concussions (Mild Traumatic Brain Injury).
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