First of all, we analyze what causes foot drop and inversion, which are generally the sequelae of poliomyelitis, also can be the sequelae of cerebral palsy, also can be caused by nerve injury after trauma, manifested as Achilles tendon contracture, the imbalance of antagonistic muscle strength in the medial and lateral ankle joint, a few combined with bony deformity, generally use Achilles tendon release and lengthening, tendon displacement antagonistic muscle balance, combined with bony deformity can be corrected at the same time to restore Patients with combined bony deformities can be corrected at the same time to restore the normal shape and weight-bearing structure of the foot and eventually treat the ankle swelling and pain.