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Official Description

Acetabuloplasty; (eg, Whitman, Colonna, Haygroves, or cup type)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

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.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The acetabuloplasty procedure is indicated for various conditions affecting the hip joint, particularly those that involve deformities of the acetabulum. The following are specific indications for performing this procedure:

  • Congenital Hip Deformities - Conditions present at birth that affect the normal development of the hip joint, leading to improper alignment and function.
  • Acetabular Dysplasia - A developmental disorder where the acetabulum is shallow or improperly formed, resulting in instability of the hip joint.
  • Post-Traumatic Deformities - Deformities resulting from previous injuries or trauma to the hip joint that have led to changes in the acetabulum's shape.
  • Osteoarthritis - Degenerative joint disease that can cause changes in the acetabulum, leading to pain and reduced mobility.

2. Procedure

The acetabuloplasty procedure involves several critical steps to ensure the successful reshaping of the acetabulum. The following outlines the procedural steps:

  • Step 1: Incision and Exposure - The procedure begins with the surgeon making an incision over the lateral aspect of the hip. This incision allows for the dissection and release of the surrounding soft tissue, providing the necessary access to the hip joint.
  • Step 2: Dislocation of the Femoral Head - Once the hip joint is adequately exposed, the femoral head is dislocated from the acetabulum. This step is crucial as it allows the surgeon to work directly on the acetabulum without obstruction.
  • Step 3: Reshaping the Acetabulum - The surgeon utilizes an osteotome to carefully remove cartilage and bone from the surface of the acetabulum. This reshaping is tailored to the specific deformity being addressed, ensuring that the new socket will accommodate the femoral head properly.
  • Step 4: Placement of the Prosthetic Cup - After the acetabulum has been reshaped, a prosthetic cup is secured to the acetabulum. This cup serves as the new socket for the femoral head, providing stability and improved function.
  • Step 5: Relocation of the Femoral Head - The femoral head is then relocated within the newly placed prosthetic cup, establishing the new hip joint configuration.
  • Step 6: Closure of Incisions - The final step involves closing the incisions in layers to promote optimal healing and recovery.
  • Alternative Step for Congenital Deformity - In cases of congenital hip deformity, the femoral head may be placed deep within the acetabular socket. The rim of the acetabulum is prepared with the osteotome, and bone grafting is performed to fill any gaps created by the acetabular osteotomy. The hip is then placed in abduction, and a hip spica cast is applied to support the healing process.

3. Post-Procedure

Post-procedure care following acetabuloplasty is essential for ensuring proper recovery and function of the hip joint. Patients are typically monitored for any complications and provided with pain management as needed. The application of a hip spica cast, particularly in cases involving congenital deformities, is crucial as it helps maintain the position of the femoral head within the acetabulum during the healing process. As the acetabulum heals, the femoral head serves as a mold for the socket, and as bone callus forms, it conforms to the shape of the femoral head, ultimately resulting in a hemispherically shaped socket. Patients may require physical therapy to regain strength and mobility in the hip joint as they progress through their recovery. Regular follow-up appointments are necessary to assess healing and ensure the proper function of the hip joint.

Short Descr RECONSTRUCTION OF HIP SOCKET
Medium Descr ACETABULOPLASTY
Long Descr Acetabuloplasty; (eg, Whitman, Colonna, Haygroves, or cup type)
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 1 - Co-surgeons could be paid, though supporting documentation is required...
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P3D - Major procedure, orthopedic - other
MUE 1
CCS Clinical Classification 162 - Other OR therapeutic procedures on joints
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
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