Which rocker is active during midstance?

Which rocker is active during midstance?

• A. Ankle rocker
• B. Heel rocker
• C. Forefoot rocker
• D. Toe rocker

Answer: (A)

During midstance, the body’s weight is supported by the stance foot while the tibia moves forward over the foot. This forward progression is enabled mainly by the ankle acting as a rocker—the heel remains the fixed pivot as the ankle dorsiflexes and the tibia advances. That ankle rocker allows the leg to progress over the foot smoothly while maintaining contact with the ground. The heel rocker happens earlier, when the heel first contacts the ground and the tibia starts to roll forward over the calcaneus. The forefoot rocker occurs later in the stance phase as the forefoot becomes the pivot point, and the toe rocker appears during push-off as the toes provide the final pivot.

During midstance, the body’s weight is supported by the stance foot while the tibia moves forward over the foot. This forward progression is enabled mainly by the ankle acting as a rocker—the heel remains the fixed pivot as the ankle dorsiflexes and the tibia advances. That ankle rocker allows the leg to progress over the foot smoothly while maintaining contact with the ground. The heel rocker happens earlier, when the heel first contacts the ground and the tibia starts to roll forward over the calcaneus. The forefoot rocker occurs later in the stance phase as the forefoot becomes the pivot point, and the toe rocker appears during push-off as the toes provide the final pivot.