Fig. (1) Degenerative arthritis of the left hip due to Juvenile Idiopathic Arthritis, treated by total hip arthroplasty (THA).A - Pre-operative anteroposterior (AP) radiograph of the pelvis. Note the protusio due to loss of medial bone stock, the virtual absence of joint space, small osteophytes, and cyst formation of the left hip.B - Pre-operative frog lateral view of the left hip.C - Post-operative radiograph showing a cementless cup with screws and a cementless proximally porous coated stem.D - Post-operative frog lateral view of the left hip.The prosthesis used by the author, in this case, was one of the earliest cementless implants available for small proportioned patients. This prosthesis is no longer available.