Recently, a post-polio patient from the Yimeng Mountains came to the hospital with 8 cm of shortening of one lower limb and limp walking. Bone lengthening is suitable for patients with unequal lower limbs due to polio sequelae, trauma, bone defects, tumors, limb deformities, and shortening of one limb by more than 3 cm. The method is to dissociate the bone body through minimally invasive surgery, followed by the installation of a functional lengthening device that gradually separates the severed ends on both sides while the new bone grows, allowing for the formation of new bone in the vascularized crustal tissue, thereby lengthening the length of the bone. The most significant advantage of this technique is that it avoids damage to the bone graft and the donor area, as well as a series of resulting complications, and it also has the advantage of lengthening the soft tissue while lengthening the bone tissue and maintaining the biological properties of the original net tissue. Of course, this technique also has the disadvantages of a long treatment course and inconvenience to the patient’s life and work while wearing the retraction device.