Thigh root pain after 6 months of internal fixation of femoral neck fracture and walking with crutches is usually considered abnormal, which may be triggered by non-union of the fracture or necrosis of the femoral head. Most of the patients with femoral neck fracture are treated by surgery, internal fixation of fracture reduction, patients start partial weight bearing 2~3 months after surgery, and the fracture healing time is 3~6 months, after the fracture healing time, the patient can fully weight bearing and return to normal walking. If the patient can not bear weight or have pain in the affected area 6 months after surgery, and the radiograph shows that the fracture line exists and the bone scab is not formed, it can be considered that the fracture is not healed, and the further development can form the ischemic necrosis of the femoral head, and it may also result in the femoral head collapse and osteoarthritis of the hip joint. Femoral neck fracture internal fixation 6 months walking thigh root pain, we suggest that the patient timely medical review, clear cause, so as not to delay the condition.