Injury to the common peroneal nerve can be treated according to the specific situation: 1, mild nerve injury: only short-term braking of the knee joint, local ultrashort wave therapy, microwave therapy, and oral administration of celecoxib capsules, loxoprofen sodium, and miconazole to promote nerve inflammation and nerve tissue repair. 2, severe common peroneal nerve tear: immediate surgical exploration is required to reanastomize the nerve severed end and restore nerve integrity and continuity. reanastomosis to restore the integrity and continuity of the nerve. Postoperative braking of the knee joint is performed to promote healing of the nerve. After treatment with these methods, the nerve usually recovers gradually over 3-6 months and the nerve conduction function returns to normal levels. In exceptional cases such as extremely severe nerve injury, the nerve function is difficult to recover completely and the patient may experience severe consequences of foot drop, which affects normal walking and movement.