The common cause of large leg gaps in women is inversion of the knee. The causes of inversion of the knee include the following: First, mild bowed legs after birth and poor walking posture can aggravate the inversion deformity, but this deformity can gradually correct itself during normal growth. Second, rickets, can occur in the lower extremities of osteochondrosis, appear in the lower extremities, after walking with weight gradually appear inversion deformity of the knee joint. Third, proximal tibial fractures and epiphyseal injuries can occur during the healing process as a deformity heals or the epiphysis stops growing, causing inversion deformity of the knee joint. Fourth, when osteoarthritis occurs, the medial joint space is heavily worn and can be followed by an inversion deformity of the knee joint.