ANATOMY
PELVIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hip extension with knee flexion
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Hip extension with knee extension
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Hip flexion with knee flexion
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Hip flexion with knee extension
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Detailed explanation-1: -Passive insufficiency of rectus femoris muscle occurs due to excessive stretching when there is knee flexion with hip extension.
Detailed explanation-2: -Since the hamstring muscles cross both the hip and the knee, when you try to get the leg further behind you (hip extension) with a bent knee (knee flexion), the hamstrings shorten to such a degree that they fail to contract anymore.
Detailed explanation-3: -Simply stated, active insufficiency occurs when a muscle that crosses two joints (like the rectus femoris) cannot produce force equally across the two joints. The rectus femoris enters active insufficiency when the hip is flexed, because it cannot also contract at the knee joint.
Detailed explanation-4: -Active Insufficiency The shortening of the Rectus femoris limits full hip flexion when the knee is fully extended.