CPT® Code 20972

1. Indications

The free osteocutaneous flap with microvascular anastomosis is indicated for the repair of complex soft tissue and bony defects. The following conditions may warrant this procedure:

• Complex Defects: Situations where there is a significant loss of both soft tissue and bone, often due to trauma, surgical resection, or congenital anomalies.
• Infection: Cases where infected tissue needs to be removed and replaced with viable tissue to promote healing and restore function.
• Oncological Resection: Following the removal of tumors that have compromised both the soft tissue and underlying bone structures.
• Chronic Non-Healing Wounds: Conditions where traditional wound healing methods have failed, necessitating advanced reconstructive techniques.

2. Procedure

The procedure for a free osteocutaneous flap with microvascular anastomosis involves several critical steps:

• Step 1: The surgeon begins by measuring the defect to be repaired, determining the necessary dimensions of the cutaneous portion of the flap to ensure adequate coverage and support.
• Step 2: Incision lines are carefully drawn on the skin at the donor site, which is typically selected based on the availability of tissue and the need for similar characteristics in the flap.
• Step 3: The skin at the donor site is incised along the marked lines, and dissection is performed to separate the skin from the underlying tissues while preserving the vascular pedicle, which is essential for the flap's blood supply.
• Step 4: The underlying musculature is exposed, and careful attention is given to preserving the blood vessels and nerves that supply the area, ensuring the viability of the flap.
• Step 5: The bone to be harvested is then exposed, and the required amount of bone is carefully removed, ensuring that the bony vasculature is preserved to maintain blood flow to the bone.
• Step 6: Once the osteocutaneous flap is harvested with intact vascular structures, it is severed from the donor site and prepared for transfer to the recipient site.
• Step 7: At the recipient site, the bone is positioned into the bony defect and secured in place, ensuring proper alignment and stability.
• Step 8: The vascular structures of the flap are anastomosed to the blood vessels at the recipient site using microvascular techniques, which are critical for re-establishing blood flow to the flap.
• Step 9: Finally, the skin portion of the flap is positioned in the defect and secured with sutures, completing the reconstruction process.

3. Post-Procedure

Post-procedure care for a free osteocutaneous flap with microvascular anastomosis includes monitoring the flap for signs of viability, such as color, temperature, and capillary refill. Patients may require pain management and wound care instructions to promote healing. Follow-up appointments are essential to assess the integration of the flap and the healing of both the donor and recipient sites. The donor site may be closed with sutures or may require a separately reportable skin graft, depending on the extent of the tissue removed. Rehabilitation may also be necessary to restore function in the affected area.