After osteotomy surgery, it takes about 3 months at the earliest to walk on the ground. The principle of osteotomy is to restore the continuity of the bone by amputating a segment of the bone and re-fixing it with an artificial allograft or autologous bone. Because of local bone grafting, the healing process of bone grafting is equivalent to the healing process of fracture, which takes 3 months after surgery to reach the standard of clinical healing. When the clinical healing standard is reached, it means that the local bone graft at the osteotomy has reached the clinical healing standard, and then the strength and hardness of the bone at the osteotomy can be restored initially, so that the initial activities on the ground can be carried out, but the activities on the ground at this time are limited to daily activities on the ground. In order to resume strenuous sports and heavy physical work, it is generally necessary to wait until six months after the operation, after the osteotomy has reached the local bony healing, then the above strenuous sports can be resumed.