Question

question 37 (mandatory) (2 points) listen during screw-home mechanism of the knee a) the tibia internally rotates with knee extension b) the tibia externally rotates with knee extension c) the tibia externally rotates with knee flexion d) the fibula moves superior with knee extension

Explanation:

The screw - home mechanism of the knee occurs during the last 20 - 30 degrees of knee extension. In this mechanism, the tibia externally rotates relative to the femur as the knee extends. Option a says the tibia internally rotates during extension, which is wrong. Option c links external rotation with flexion, which is incorrect. Option d is about the fibula moving superior during extension, but the screw - home mechanism is about tibial rotation, not fibular movement. So option b is correct.

Answer:

b) The tibia externally rotates with knee extension