Passive insufficiency of which knee joint muscle would limit knee flexion?
A) Rectus femoris
B) Biceps femoris
C) Popliteus
D) Vastus lateralis

Question

Quizplus · Accepted Answer

Passive insufficiency occurs when a muscle cannot be stretched any further without causing discomfort or injury. The rectus femoris muscle passes across both the hip and knee joints, thus making it prone to passive insufficiency. When fully extended at the knee joint, the rectus femoris muscle is shortened at the hip joint, limiting its ability to further flex the knee joint. Therefore, the passive insufficiency of the rectus femoris would limit knee flexion.

Passive Insufficiency of Which Knee Joint Muscle Would Limit Knee