If a person is unable to "unlock" the knee joint to permit flexion of the leg, which of the following muscles is most likely damaged?

Question

Quizplus · Accepted Answer

If a person is unable to "unlock" the knee joint to permit flexion of the leg, the muscle that is most likely damaged is the popliteus. The popliteus muscle rotates the femur laterally ("unlocks" the knee) or rotates the tibia medially, depending on which bone is fixed. This action results in unlocking of the knee joint to initiate flexion of the leg at the joint.

If a Person Is Unable to "Unlock" the Knee Joint