One leg is long and one leg is short, which is clinically known as bilateral lower limb inequality. This situation is often caused by the following diseases: 1. There may be congenital hip dislocation. This type of disease is mainly due to congenital developmental factors, resulting in one side of the hip joint dysplasia, or have to the back side, the upper side of the dislocation, then the performance of the lower limbs will be shortened. 2, there may be scoliosis disease. The company’s main business is the development of a new product, which is a new product. If there is a serious bone and joint injury involving one of the lower limbs, there is a possibility of bilateral lower limb inequality after recovery. 4, may be caused by osteoarthritis of the lower limbs. This type of disease is mainly due to excessive wear and tear on one side of the lower limb joints, which in turn causes shortening of this side of the lower limb.