In case of femoral head necrosis, there will be hip pain and prolonged painful irritation will cause limited range of motion of the hip joint. On top of this muscle atrophy will also be present, and the restricted range of motion combined with muscle contracture will result in the inability to straighten the leg. Especially in the case of advanced femoral head necrosis with significant osteophytes and osteoarthritis, the impaired range of motion of the hip joint is more obvious. Regardless of the cause, it is enough to prove that the femoral head necrosis has been there for a long time. In this case you should go to the hospital for a review to see the specific stage of femoral head necrosis and choose the corresponding treatment, otherwise there is no way to complete a normal life, which can seriously cause walking with one foot high and one foot low and tiptoeing.