CPT® Code 27120

The procedure described by CPT® Code 27120, known as acetabuloplasty, involves the surgical reshaping of the acetabulum, which is the cup-shaped depression located on the external surface of the pelvis. This procedure is primarily performed to enhance the functionality of the hip joint, particularly in cases where there are deformities affecting the acetabulum. Various surgical techniques, such as those developed by Whitman, Colonna, Haygroves, or the cup type, may be employed depending on the specific nature and severity of the deformity present. The surgical approach typically begins with an incision made over the lateral aspect of the hip, allowing for the dissection and release of soft tissue to gain access to the hip joint. Once the joint is exposed, the femoral head is dislocated from the acetabulum to facilitate the reshaping process. The surgeon then utilizes an osteotome to remove cartilage and bone from the acetabular surface, preparing it for the placement of a prosthetic cup. This cup is securely attached to the acetabulum, and the femoral head is subsequently relocated within this newly formed socket. The procedure concludes with the closure of the incisions in layers, ensuring proper healing. In cases of congenital hip deformity, additional steps may be taken, such as placing the femoral head deep within the acetabular socket and performing bone grafting to fill any gaps created during the osteotomy. The hip is then positioned in abduction and a hip spica cast is applied to support the healing process, allowing the femoral head to mold the acetabulum as it heals, ultimately forming a hemispherically shaped socket.