Fig. (2) Juvenile Idiopathic Arthritis of both hips with advanced arthritic changes involving the right hip, treated by THA.A - Pre-operative AP radiograph of the pelvis. Note the absent joint space, subluxation with dysplasia, and subchondral sclerosis and cyst formation of the right hip.B - Pre-operative frog lateral view of the left hipC - Post-operative radiograph showing a cementless cup with screws and a cementless Wagner Cone femoral stem (Zimmer Biomet, Warsaw, IN).D - Post-operative frog lateral view of the left hip.The prosthesis used in this case is the preferred one by the author currently.