The posterolateral corner (PLC) of the knee is the complex of structures providing posterolateral rotational stability, comprising the fibular collateral ligament, popliteofibular ligament, popliteus tendon, posterolateral capsule, and arcuate ligament complex.
Resists varus stress, external tibial rotation, and posterolateral tibial translation. The PLC acts as the primary external rotation stabiliser, working in concert with the PCL to resist combined posterior and rotational forces.
PLC injuries are frequently missed in multi-ligament knee injuries. The dial test (external tibial rotation increase at 30 degrees only indicates isolated PLC; at both 30 and 90 degrees indicates combined PLC and PCL). Acute PLC repair within 3 weeks provides better outcomes than chronic reconstruction. The modified Larson or LaPrade techniques reconstruct the FCL and popliteofibular ligament anatomically.
Unrecognised PLC insufficiency causing graft failure after ACL reconstruction — PLC must be identified and addressed before or concurrently with ACL surgery.
LaPrade posterolateral corner reconstruction creating anatomic FCL and popliteofibular ligament grafts from lateral epicondyle to fibular head and popliteus, restoring the complete posterolateral constraint system.
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