After heel contact, rapid pronation helps with which function?

After heel contact, rapid pronation helps with which function?

• A. Creating a rigid lever only
• B. Shock absorption and adapting to surfaces
• C. Preventing all tibial motion
• D. Eliminating pelvic motion

Answer: (B)

Rapid pronation after heel contact serves to dampen impact and let the foot adapt to the ground. By unlocking the subtalar and midfoot joints, the arch can flatten slightly, making the foot a flexible adaptor that conforms to irregular surfaces and helps absorb shock. This controlled motion also allows the leg to progress with a bit of tibial rotation. Later in the stance phase the foot can re-stiffen (supinate) to act as a rigid lever for propulsion.

Rapid pronation after heel contact serves to dampen impact and let the foot adapt to the ground. By unlocking the subtalar and midfoot joints, the arch can flatten slightly, making the foot a flexible adaptor that conforms to irregular surfaces and helps absorb shock. This controlled motion also allows the leg to progress with a bit of tibial rotation. Later in the stance phase the foot can re-stiffen (supinate) to act as a rigid lever for propulsion.