X leg is not rickets, X leg is the lower limb standing, the inner side of both knee joints close to each other, but the inner side of both feet can not be close to each other, in medicine is known as knee valgus deformity. There are many reasons for the occurrence of X-shaped legs, which may be caused by strong external force, poor development in infancy and childhood, rickets, malnutrition or congenital genetic factors, or even incorrect walking posture. If X-shaped legs occur more often in the elderly, it may be due to rheumatoid arthritis, or due to osteoarthritis and other reasons. If you are an adult, you need to go to the hospital in time, and then choose the surgical treatment; if you are a child, you can first prefer conservative treatment.