Some times, the legs will be relatively crooked either by nature or from an injury. in the same way that if the wheels of a car are not aligned properly they will wear out unevenly and prematurely, the same is true for the joints in the body if they are very far out of their normal alignment. As a result, sometimes it becomes recommended to realign somebody’s legs to make them straight. When a person is still growing there are some relatively minimally invasive ways of doing so. Once a person is completely done growing, this still can be done but the procedures are more invasive. This kind of surgery is an option for people well into their 50s.