During loading response, quadriceps eccentrically control which knee motion?

During loading response, quadriceps eccentrically control which knee motion?

• A. Hip extension
• B. Ankle plantarflexion
• C. Toe extension
• D. Knee flexion

Answer: (D)

During loading response, the body must absorb the shock of weight coming onto the leg. The quadriceps work eccentrically to control knee flexion, lengthening while producing force to slow the forward drop of the tibia and prevent the knee from buckling. This slows and moderates the knee bend to stabilize the joint for the rest of stance. Other movements in this phase are handled by different muscle groups—hip extensors for hip motion and plantarflexors for ankle motion—so the primary knee action being managed by the quadriceps through eccentric contraction is knee flexion.

During loading response, the body must absorb the shock of weight coming onto the leg. The quadriceps work eccentrically to control knee flexion, lengthening while producing force to slow the forward drop of the tibia and prevent the knee from buckling. This slows and moderates the knee bend to stabilize the joint for the rest of stance. Other movements in this phase are handled by different muscle groups—hip extensors for hip motion and plantarflexors for ankle motion—so the primary knee action being managed by the quadriceps through eccentric contraction is knee flexion.