Why does the tibia externally rotate with extension of the knee during the "screw-home" mechanism?
A) It occurs because the lateral femoral condyle is larger than the medial condyle.
B) It occurs because the medial femoral condyle is larger than the lateral condyle.
C) It occurs to unlock the knee.
D) It occurs to lock the knee.
E) It occurs to allow the anterior cruciate ligament to loosen.

Question

Quizplus · Accepted Answer

The medial femoral condyle is larger than the lateral condyle, causing the tibia to externally rotate during knee extension to achieve full extension and stability, known as the "screw-home" mechanism.

Why Does the Tibia Externally Rotate with Extension of the Knee