What muscle is primarily responsible for unlocking the tibia when flexing the knee?
A) Sartorius
B) Biceps femoris
C) Popliteus
D) Plantaris

Question

Quizplus · Accepted Answer

The popliteus muscle is responsible for unlocking the tibia during flexion of the knee. This muscle initiates internal rotation of the tibia, which unlocks the locked knee joint, allowing flexion to occur. The other muscles listed (sartorius, biceps femoris, and plantaris) are not directly involved in unlocking the tibia during knee flexion.

What Muscle Is Primarily Responsible for Unlocking the Tibia When