The action tibialis posterior muscle is to adduct the forepart of the foot and to aid in inversion and plantar flexion. Hypertonicity of this muscle was well known as a main cause of equinovarus or inversion of the foot and internal rotation deformity of the ankle. Percutaneous motor point block to tibialis posterior muscle might be a considerable method as a physiatric management for the ankle deformity by hypertonicity of the muscle. The posteromedial approach to the muscle has been used in needle electrode insertion of electromyography sampling the flexor digitourm is high in posteromedial approach widely used. because the tibialis posterior is heavily overladen with surrounding muscles and lined by neurovascular bundles. We preferred anterior approach to posteromedial approach.

Percutaneous motor point block to tibialis posterior muscle by anterior approach was done with 7% aqueous solution of phenol in 7 cerebral palsied. We suggest anterior approach to the muscle may be safer, easier, and more effective than the posteromedial approach.