The erector spinae helps prevent which gait deviation or motion?

The erector spinae helps prevent which gait deviation or motion?

• A. Jackknifing forward of the trunk
• B. Excessive toe extension
• C. Excessive forefoot supination only
• D. Hip hiking only

Answer: (A)

The main idea here is how the back extensors stabilize the trunk during gait. The erector spinae run along the spine and create an extension moment at the lumbar spine, keeping the trunk upright as the leg swings forward. Without that extension control, gravity would pull the upper body into forward flexion, leading to a jackknifed posture where the trunk folds forward relative to the pelvis. So, these muscles help prevent that forward collapse of the trunk. The other options involve different body regions: toe extension concerns the foot and ankle, forefoot supination is a foot mechanics issue, and hip hiking is a pelvic/hip strategy to clear the limb that isn’t primarily prevented by the back extensors.

The main idea here is how the back extensors stabilize the trunk during gait. The erector spinae run along the spine and create an extension moment at the lumbar spine, keeping the trunk upright as the leg swings forward. Without that extension control, gravity would pull the upper body into forward flexion, leading to a jackknifed posture where the trunk folds forward relative to the pelvis. So, these muscles help prevent that forward collapse of the trunk.

The other options involve different body regions: toe extension concerns the foot and ankle, forefoot supination is a foot mechanics issue, and hip hiking is a pelvic/hip strategy to clear the limb that isn’t primarily prevented by the back extensors.