Abstract
The posterolateral corner (PLC) is composed of different 28 structures that act as static and dynamic stabilisers of the knee during varus and rotational motion. This region of the knee is inherently unstable because of the convex on convex relationship of the femur and tibia at the lateral aspect of the knee. The biomechanics of these structures have been thoroughly examined on cadaveric models and have shown that PLC deficiency causes increased tension on both cruciate ligaments in addition to perceived knee instability. Improved diagnostic modalities for early injury detection include a thorough physical examination, bilateral stress radiographs and magnetic resonance imaging. Only 16% of the PLC injuries occur in isolation, with cruciate ligaments and peroneal nerve involvement being the most common concomitant injuries. Clinical outcomes data support initial conservative management for grade 1 and 2 injuries and surgical management for grade 3 PLC injuries. Finally, the literature heavily favours anatomical reconstruction techniques over surgical repair or nonanatomical techniques when surgery is indicated.
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