A pelvic osteotomy is done to correct a hip socket (acetabulum) that is too shallow or misshapen.
Your child's surgeon will make a cut on the outside of the hip.
A piece of bone is wedged into the top of the socket. This makes the size of the socket larger so that it covers the head of the femur (thigh bone) better.
This surgery is often done in combination with a Varis Derotation Osteotomy.