Quadriceps become active in very late swing primarily for what purpose?

Quadriceps become active in very late swing primarily for what purpose?

• A. Preparation for heel contact
• B. Toe clearance
• C. Supination of the rearfoot
• D. Hip flexion initiation

Answer: (A)

In late swing the main idea is getting the leg ready for weight-bearing at heel contact. The leg is still moving forward and needs to be positioned so the foot can strike the ground in a stable, controlled way. The quadriceps are recruited to extend the knee as the foot nears contact, helping to bring the knee into near-full extension and stabilize it for loading. This makes the initial contact smoother and supports the subsequent stance phase, often by coordinating with the hamstrings that previously controlled knee flexion to decelerate the leg. Toe clearance is achieved mainly by ankle dorsiflexion, not the quadriceps; hip flexion initiation happens earlier in the swing, and rearfoot orientation is a separate foot/ankle control not driven by this knee extensor action.

In late swing the main idea is getting the leg ready for weight-bearing at heel contact. The leg is still moving forward and needs to be positioned so the foot can strike the ground in a stable, controlled way. The quadriceps are recruited to extend the knee as the foot nears contact, helping to bring the knee into near-full extension and stabilize it for loading. This makes the initial contact smoother and supports the subsequent stance phase, often by coordinating with the hamstrings that previously controlled knee flexion to decelerate the leg. Toe clearance is achieved mainly by ankle dorsiflexion, not the quadriceps; hip flexion initiation happens earlier in the swing, and rearfoot orientation is a separate foot/ankle control not driven by this knee extensor action.