The physiologic nature of spiral leg, also known as inversion deformity of the knee, requires no treatment, while the pathologic correction includes semi-epiphyseal plate block, osteotomy orthopedic surgery and knee arthroplasty. Spiral legs can be divided into physiologic and pathologic, physiologic is usually caused by the lower limbs after long-term standing and weight-bearing, generally do not need to be corrected, can be recovered on their own. Pathological inversion of the knee deformity is mainly due to rickets and cartilage dysplasia syndrome, which requires targeted treatment. The symptomatic treatment of rotunda leg is mainly through the semi-epiphyseal plate blocking surgery, which can make the lower limb force balance after the surgery, and also can be performed osteotomy orthopedic surgery and knee replacement, which are all aimed at restoring the balance of the force of the lower limb and restoring the function of the knee joint. Pathological knee valgus deformity, need to actively consult the doctor, under the guidance of the physician reasonable treatment.