Pre-toe-off hip flexors operate eccentrically because the hip is doing which action?

Pre-toe-off hip flexors operate eccentrically because the hip is doing which action?

• A. Maximally flexing
• B. Abducting only
• C. Internally rotating only
• D. Extending

Answer: (D)

Eccentric control happens when a muscle lengthens while producing force to slow or brake a movement. In the pre-toe-off phase of gait, the hip is extending as the leg moves toward propulsion. The hip flexors must lengthen under tension to decelerate and regulate this extension, keeping the leg moving smoothly into toe-off. Since the movement at that moment is extension, the hip flexors act eccentrically. Abduction or internal rotation aren’t the primary actions driving this phase, and maximal flexion isn’t what's occurring as the leg moves toward extension.

Eccentric control happens when a muscle lengthens while producing force to slow or brake a movement. In the pre-toe-off phase of gait, the hip is extending as the leg moves toward propulsion. The hip flexors must lengthen under tension to decelerate and regulate this extension, keeping the leg moving smoothly into toe-off. Since the movement at that moment is extension, the hip flexors act eccentrically. Abduction or internal rotation aren’t the primary actions driving this phase, and maximal flexion isn’t what's occurring as the leg moves toward extension.