Knee flexors during loading response are mostly active at which joint?

Knee flexors during loading response are mostly active at which joint?

• A. Hip
• B. Ankle
• C. Subtalar joint
• D. MTP joint

Answer: (A)

During loading response the body must absorb impact and stabilize the leg as weight is accepted. The knee flexors (the hamstrings) are active to control knee flexion eccentrically, but they cross both the knee and the hip. In this phase their activation also contributes to hip extension moments to stabilize the pelvis and trunk as the limb accepts load. Because their crossing at the hip allows them to influence hip motion and provide this additional stabilization, their most functionally significant action during loading response is at the hip. The other joints (ankle, subtalar, MTP) are more involved in foot placement and shock modulation, not the primary action of the knee flexors in this phase.

During loading response the body must absorb impact and stabilize the leg as weight is accepted. The knee flexors (the hamstrings) are active to control knee flexion eccentrically, but they cross both the knee and the hip. In this phase their activation also contributes to hip extension moments to stabilize the pelvis and trunk as the limb accepts load. Because their crossing at the hip allows them to influence hip motion and provide this additional stabilization, their most functionally significant action during loading response is at the hip. The other joints (ankle, subtalar, MTP) are more involved in foot placement and shock modulation, not the primary action of the knee flexors in this phase.