The surgery performed for the correction of rotunda leg is generally useful to correct the leg deformity and to restore the lower limbs to their natural and aesthetic state. Loop leg is a type of knee inversion, also known as O-shaped leg, bow leg, mainly manifested as both knees can not be close together when the heels are together. It can be categorized into physiological knee inversion and pathological knee inversion. Physiological inversion of the knee generally does not require surgery, and most of them can be corrected by wearing orthopedic shoes and improving the way of walking. Surgical intervention may be considered in patients with pathologic inversion such as rickets with persistent deformity. Surgery can correct leg deformity and return the lower limb to a natural and beautiful state through close measurement and planning before surgery and wedge osteotomy combined with external fixator or internal fixation to restore the normal line of force of the lower limb. It is recommended that patients with rotunda leg should consult the hospital in time, combine with the medical history and auxiliary examination, and under the guidance of the doctor, clarify the cause as well as the type of the disease and then carry out further treatment.