FUNCTIONAL-SIGNIFICANCE OF TORSION OF THE TENDON OF TIBIALIS POSTERIOR

The authors describe the anatomical necessity and functional significa nce of torsion of the tendon of tibialis posterior. A wooden model of the right lower extremity has been constructed which includes represen tations of the ankle, subtalar, and oblique midtarsal joints. The mode l is used to show that the presence of torsion within the tendon of ti bialis posterior eliminates the need for any longitudinal slippage bet ween individual tendon fibers during triplane movement of the joints o f the lower extremity.