Fast Five Quiz: Are You Prepared to Confront Knee Dislocations?

Richard H. Sinert, DO

Disclosures

November 09, 2015

Anterior dislocation often is caused by severe knee hyperextension. Cadaver research has shown that approximately 30° of hyperextension is required before dislocation will occur.

Posterior dislocation occurs with anterior-to-posterior force to the proximal tibia, such as a dashboard type of injury or a high-energy fall on a flexed knee. The image below shows a radiograph of a posterior dislocation. More than one half of all dislocations are anterior or posterior, and both of these have a high incidence of popliteal artery injury.

Medial, lateral, and rotatory dislocations require varus, valgus, or rotatory components of applied force.

For more on the presentation of knee dislocation, read here.

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