Tibialis posterior is active during approximately what portion of the gait cycle?

Tibialis posterior is active during approximately what portion of the gait cycle?

• A. 0-10%
• B. 60-100%
• C. 70-90%
• D. 5-55%

Answer: (D)

Tibialis posterior mainly functions during the stance phase of gait to control pronation and support the medial arch as the body moves over the foot. It begins activating around heel strike and continues through loading response into mid-stance, helping to invert the foot and stabilize the arch while weight is borne. Because of this role, its activity spans the early portion of the gait cycle, roughly from just after initial contact through mid-stance—about 5% to 55% of the cycle. After about mid-stance, the demand for its activity decreases as propulsion prepares, so late stance and swing show less engagement. This timing best fits the muscle’s function during weight-bearing and arch stabilization.

Tibialis posterior mainly functions during the stance phase of gait to control pronation and support the medial arch as the body moves over the foot. It begins activating around heel strike and continues through loading response into mid-stance, helping to invert the foot and stabilize the arch while weight is borne. Because of this role, its activity spans the early portion of the gait cycle, roughly from just after initial contact through mid-stance—about 5% to 55% of the cycle. After about mid-stance, the demand for its activity decreases as propulsion prepares, so late stance and swing show less engagement. This timing best fits the muscle’s function during weight-bearing and arch stabilization.