During push-off, which action do the plantar flexors primarily produce to drive forward propulsion?

During push-off, which action do the plantar flexors primarily produce to drive forward propulsion?

• A. Ankle plantarflexion torque for forward propulsion
• B. Knee flexion torque only
• C. Hip flexion torque only
• D. Rearfoot eversion only

Answer: (A)

Propulsion in push-off comes from the ankle plantarflexors generating plantarflexion torque at the ankle. As these muscles contract, they push the forefoot into the ground, creating a ground reaction force that drives the body forward. Knee or hip flexion torques aren’t the primary source of forward thrust during this phase; they contribute to leg movement but not the main propulsive push. Rearfoot eversion is about foot orientation and does not produce the forward propulsion. Thus, the plantar flexors’ ankle plantarflexion torque is the main driver of forward propulsion.

Propulsion in push-off comes from the ankle plantarflexors generating plantarflexion torque at the ankle. As these muscles contract, they push the forefoot into the ground, creating a ground reaction force that drives the body forward. Knee or hip flexion torques aren’t the primary source of forward thrust during this phase; they contribute to leg movement but not the main propulsive push. Rearfoot eversion is about foot orientation and does not produce the forward propulsion. Thus, the plantar flexors’ ankle plantarflexion torque is the main driver of forward propulsion.