CPT® Code 21408

1. Indications

The open treatment of an orbital fracture with bone grafting, as described by CPT® Code 21408, is indicated for specific conditions and symptoms that necessitate surgical intervention. These include:

• Non-blowout orbital fractures These fractures occur in the bony structure of the orbit without the characteristic displacement seen in blowout fractures, often resulting from trauma.
• Fractures leading to misalignment of the eye Any fracture that causes the eye to be misaligned or affects ocular motility may require surgical correction to restore proper function.
• Herniation of orbital soft tissue When soft tissue protrudes through a fracture site, it can lead to complications such as vision impairment or cosmetic deformity, necessitating repair.
• Cosmetic deformities Fractures that result in visible deformities of the face or orbit may require surgical intervention for aesthetic restoration.

2. Procedure

The procedure for the open treatment of an orbital fracture with bone grafting involves several detailed steps, each critical to the successful outcome of the surgery. The following outlines the procedural steps:

• Step 1: Evaluation and Incision Marking The surgeon begins by evaluating the natural skin creases around the eye and marking incision lines to ensure minimal scarring post-surgery.
• Step 2: Temporary Tarsorrhaphy A temporary tarsorrhaphy may be performed to protect the cornea. This involves placing a mattress suture through the edges of the upper and lower eyelids to close them over the eye, providing a protective barrier during the procedure.
• Step 3: Skin Incision The skin is incised along the marked lines to visualize the underlying orbicular muscle. The incision is extended subcutaneously over the pretarsal portion of the orbicularis oculi muscle to create a skin flap that spans the full length of the incision.
• Step 4: Dissection Plane Creation A dissection plane is created between the orbicularis oculi muscle and the septum orbitale, with suborbicular undermining of the muscle performed using a lateral incision over the bony orbital rim.
• Step 5: Suborbicular Pocket Extension The suborbicular dissection plane is opened while leaving the orbital septum intact. The pocket is extended downward over the lower palpebral region, and the upper portion of the pocket below the tarsus is opened.
• Step 6: Muscle Flap Creation The remaining layer of the orbicularis oculi muscle is separated just below the lower border of the tarsus to create a skin muscle flap that aligns with the lower eyelid.
• Step 7: Retracting the Eyelid and Flap The eyelid and flap are retracted inferiorly over the anterior edge of the infraorbital rim, allowing access to the underlying bone.
• Step 8: Periosteum Stripping A periosteal elevator is used to strip the periosteum from the bone, exposing the fracture site for further intervention.
• Step 9: Identification of the Intraorbital Nerve The intraorbital nerve is identified and preserved during dissection to prevent nerve damage.
• Step 10: Fracture Reduction The borders of the fracture are identified, and any herniated orbital soft tissue is reduced back into the orbit. The fracture is then carefully reduced to restore alignment.
• Step 11: Bone Grafting An autogenous bone graft is harvested from a donor site, such as the maxillary wall, calvaria, iliac crest, rib, or fibula. The graft is shaped to fit the contour of the bony deficit and inserted to prevent soft tissue prolapse and restore the natural contour and volume of the orbit.
• Step 12: Securing the Graft The periosteum is redraped over the grafted bony surface and secured with sutures to ensure stability and promote healing.

3. Post-Procedure

Post-procedure care following the open treatment of an orbital fracture with bone grafting is crucial for optimal recovery. Patients are typically monitored for any signs of complications, such as infection or excessive swelling. Pain management is provided as needed, and patients may be advised to avoid strenuous activities that could impact the healing process. Follow-up appointments are essential to assess the healing of the fracture and the integration of the bone graft. Additionally, patients may receive instructions on eye care, including the use of lubricating eye drops to prevent dryness and irritation. The overall recovery time can vary based on the extent of the fracture and the individual patient's healing response.