Limb inequality, treated by traditional bone lengthening, often induces clinical problems related to soft tissues, especially when accompanied by clinical problems such as bone structure defects (fibular agenesis), adjacent bone and joint deformities, and bone nonunion. According to the characteristics of different cases, the corresponding lengthener configuration and procedure can be selected to treat the shortened limb while treating the adjacent bone and joint deformities or bone structure defects. To improve the level of limb lengthening and lengthening quality, it has guiding significance. Methods: ① Bone lengthening and bone orthopedics: for limb shortening below 20% and with adjacent joint bony deformity. (2) Bone lengthening and joint orthopedics for limb shortening of less than 20% with soft tissue contracture deformity of adjacent joints. ③ Simultaneous limb lengthening: for patients with limb shortening greater than 20%. (iv) Internal and external combined bone (limb) lengthening. It is suitable for shortened calves with fibular defects and shortened limbs with basically normal bone structure in other areas.