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Injuries to the posterolateral corner (PLC) of the knee remain difficult to diagnose, primarily because they are usually overlooked when associated with cruciate, meniscal, or multiligament injuries. This article provides an in-depth overview of the anatomy and clinical presentation of PLC injuries.. Taken together, the literature points to three recurring themes: PLC injuries are still often underdiagnosed; morphology does not always translate cleanly to imaging, especially for smaller peripheral structures; clinically relevant instability often arises from the failure of several restraints rather than a single named structure.