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Radiologic case study. The case: knee dislocation.

Knee dislocations are relatively uncommon. However, due to potential neurovascular complications, it is important that the diagnosis is not missed. There are two main classification systems. The position classification system, defined by the relation of the tibia to the femur, helps identify the mechanism of injury and possible associated complications. The Schenck classification system defines the dislocation based on ligamentous and associated injuries, and thus is useful for surgical planning. It is well recognized that treatment should consist of immediate closed reduction with frequent neurovascular assessment, followed by surgical repair/reconstruction. The timing and surgical technique remain controversial.