Question

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 is a complex movement. During knee extension, the tibia externally rotates. This is an important biomechanical aspect of knee function. Option a is incorrect as it says internal rotation. Option c is incorrect as it relates external rotation to flexion. Option d is incorrect as it mentions the fibula moving superior (the main rotational component in screw - home is of the tibia).

Answer:

B. The tibia externally rotates with knee extension