GROSS ANATOMY

Detailed explanation-1: -Passive insufficiency occurs when the multi-joint muscle is lengthened to its fullest extent at both joints, but also preventing the full ROM of each joint it crosses.

Detailed explanation-2: -The biarticulate rectus femoris [1 ] enters passive insufficiency through the completion of knee flexion when the hips are more extended or through the completion of hip extension when the knees are more flexed.

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: -Passive Insufficiency Explained Passive Insufficiency: Hamstrings are pulled taut into lengthened position as hips are fully flexed and knees fully extended.

Detailed explanation-5: -When the muscle cannot cause adequate tension at all joints, it is called active insufficiency. Whereas passive insufficiency is when the opposing muscle becomes stretched to a point at which the muscle can no longer lengthen or cause movement.