In clinical work, I often divide foot drop into the following two categories according to the presence or absence of power disorders in patients: power disorder type and passive activity disorder type I. Active dorsiflexion power disorder type of ankle joint 1. Common peroneal nerve injury: foot drop movement disorder only 1) Fracture-related: fracture of the small head of the fibula, fracture of the tibial plateau 2) Sharp stabbing injury: knife stabbing, iron or glass cut, often disconnected 3) Compression injury: abnormal swelling of the lateral collateral ligament of the knee joint due to various causes, plaster cast, cyst compression, long-term leg crossing, etc: Various causes of abnormal swelling of the knee joint, plaster compression, cyst compression, postural compression after intoxication or poisoning, long-term leg crossings, etc. 4) Strain injuries: rupture of the lateral collateral ligament of the knee joint, habitual foot fracture, etc. 5) Medically induced injuries: knee arthroscopy, weight loss and liposuction, tumor removal, etc. 6) Neuritis: viral neuritis, long-term use of immunosuppressants, etc. 2, sciatic nerve injury: in addition to foot drop, the (1) fracture-related: pelvic fracture, acetabular fracture, femoral neck fracture, femoral stem fracture, etc. (2) medical injury: hip replacement, drug injection injury, hip muscle contracture, etc. (3) stabbing injury with sharp objects: knife stabbing injury, etc. (4) compression injury: coma after intoxication, carbon monoxide poisoning coma, drug poisoning coma (5) improper exercise: splits, yoga, leg press, etc. (3) sacral plexus nerve injury 1) Fracture: C3 pelvic fracture, sacral fracture, sacroiliac joint dislocation, etc. 2) Medically induced injury: retroperitoneal tumor resection, ovarian tumor resection, etc. 4) Lumbar disc herniation: L4/5 disc protrusion compressing L5 nerve root 5) High spinal cord injury: fracture in the plane above lumbar 4 vertebrae 1. Achilles tendon contracture 1) pediatric congenital Achilles tendon shortening 2) severe Achilles tendon contracture caused by the sequelae of osteo-fascial compartment syndrome from various causes 3) Achilles tendon contracture after Achilles tendon rupture 2. congenital clubfoot deformity 3. acquired clubfoot deformity Treatment of foot drop Except for clear nerve rupture, various types of foot drop The first choice of conservative treatment for 3 months, conservative treatment includes physical rehabilitation training, electrical stimulation therapy, neurotrophic drug therapy, etc. If there is no significant progress or the recovery rate is very slow in 3 months of conservative treatment, surgery can be considered. Depending on the surgical target, surgical treatment of foot drop is divided into two main categories: nerve repair surgery and functional reconstruction surgery. I. Nerve repair surgery Nerve release Nerve suture Nerve grafting Nerve transposition II. Functional reconstruction surgery Achilles tendon lengthening Dynamic functional reconstruction Static suspension functional reconstruction (dynamic endopod) Ankle fusion (static endopod)