Authors of section

Authors

Scott Bartlett, Michael Ehrenfeld, Gerson Mast, Adrian Sugar

Executive Editor

Edward Ellis III

General Editor

Daniel Buchbinder

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Orbit malar construction with free bone graft

1. Introduction

The typical deformity of TCS is a lateral cleft through the orbit and zygoma, with loss of ocular support. This is corrected utilizing bone grafts.

Note: Due to the poor soft tissue environment, bone graft resorbtion frequently occurs. In patients whom this occurs, and in patients with more mild deformities, this may be addressed by placement of an alloplastic malar implant once basal bone continuity is established.

orbit malar construction with vascularized bone graft

2. Approaches

The zygomatico-orbital complex is best approached through a coronal approach. When choosing the location of the incision, an eventual ear construction should be considered.

Access to the orbital floor is gained through a lower eyelid transconjunctival approach.

A complete circumferential subperiosteal dissection of the orbit and periorbital skeleton is performed.

orbit malar construction with vascularized bone graft

3. Harvest of bone graft

Bone graft for the zygomatic complex

A 1 cm wide split thickness calvarial bone graft is harvested with a sufficient length to span from the residual zygoma to the native zygomatic arch.

The harvest of calvarial bone graft is performed as described in the coronal approach.

orbit malar construction with free bone graft

Bone graft for orbital floor/wall/rim

An additional split thickness calvarial bone graft is harvest for the reconstruction of the lateral orbital wall and rim.

4. Construction

Zygoma

The lateral and infraorbital rims may need to be adjusted to accept the corresponding regions of the bone graft. This can be done by the use of saws and burrs.

The bone grafts are secured with plates and/or screws to the host bone. The neo-orbital rim is trimmed and smoothened with a contouring burr.

orbit malar construction with free bone graft

Orbital floor

The prolapsed contents of the orbit are separated and retrieved from the inferior orbital fissure or cleft.

orbit malar construction with vascularized bone graft

A split thickness cranial bone graft is adapted to cover the internal orbital defects and may be secured either with screw fixation only or with plate and screw fixation (as illustrated). Resorbable plate and screw fixation is recommended in children.

treacher collins syndrome

5. Aftercare following construction of zygomatico orbital complex

Apply ice packs (may be effective in a short term to minimize edema).

Eye lid incisions should be kept well lubricated with ophthalmic antibiotic ointment. A temporary tarsorrhaphy may be useful to help protect the globe.

The sterile dressing placed over the incisions is maintained for a minimum of 48 hours. Thereafter routine wound care should be instituted.

Antibiotic prophylaxis is continued for 1-5 days depending on the nature, complexity, and duration of the surgical procedure.

Remove sutures from skin after approximately 7-10 days if nonresorbable sutures have been used.

Regular follow up examinations to monitor healing are required.

Avoid sun exposure and tanning to skin incisions for several months.