Influence of shoe torsional stiffness on foot and ankle biomechanics during tennis forehand strokes.

Shoe torsional stiffness has no effect on performance parameters (running velocity of the center of mass, ground reaction forces, and stance duration) during tennis forehand strokes.Decreased shoe torsional stiffness increased the maximal forefoot inversion angle and the range of motion of forefoot inversion-eversion during tennis forehand strokes and movements.Increased footwear torsional stiffness causes higher maximal ankle inversion angle which may increase the risk for ankle sprains in SRDF.