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In an auto accident, the patient's knee strikes the dashboard which in turn pushes the head of the femur posteriorly out of its socket. Which ligament is most likely ruptured by this posterior dislocation?

Question

In an auto accident, the patient's knee strikes the dashboard which in turn pushes the head of the femur posteriorly out of its socket. Which ligament is most likely ruptured by this posterior dislocation?

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Solution

The ligament most likely ruptured by a posterior dislocation of the femur, caused by a knee striking the dashboard in an auto accident, is the Ischiofemoral ligament. This ligament is located at the back of the hip joint and helps to limit extension and internal rotation of the hip. When the femur is pushed posteriorly, it can put excessive strain on this ligament, leading to a rupture.

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