Authors of section

Authors

Carl-Peter Cornelius, Nils Gellrich, Søren Hillerup, Kenji Kusumoto, Warren Schubert

Executive Editors

Edward Ellis III, Kazuo Shimozato

General Editor

Daniel Buchbinder

Open all credits

Orbit, lateral orbital wall fracture

Introduction

Isolated lateral orbital wall fractures are very rare. This type of fracture pattern is seen in conjunction with the zygomatic complex fractures which is described in the section of the zygoma.

Clinical diagnosis is based on meticulous examination of the eye, including patient vision and palpation of the orbital aperture.
Prior to CT imaging, 2-D x-rays were considered sufficient for pre- and postoperative diagnostics in orbital fractures. One of the great weaknesses of 2-D imaging is that in many cases a fracture is revealed, but not the degree of fracture displacement. Since the advent of CT imaging, the surgeon can better define fractures, as well the degree of fracture displacement and the necessity for fracture reduction.

The complexity of an orbital fracture is defined by the combination of its anterior-posterior and mediolateral extensions. This complexity is not visible on 2-D x-rays. Therefore, proper diagnosis and treatment should be based on voxel-based datasets (CT, cone beam).

A common feature of an orbital wall fracture is intra-/periorbital air which appears clinically as emphysema (independent of whether the injury was penetrating or nonpenetrating).

The most widely available technology is CT scanning which has the advantage of combined hard- and soft-tissue visualization. Cone beam technology is becoming increasingly popular although only hard tissues can be reliably assessed. MRI is limited to soft-tissue visualization with only indirect information on hard tissues, and is not part of the standard work-up of orbital fractures.

In some cases, radiographic assessment alone is insufficient to determine the extent, morphology, and quality of the fracture. In some complex cases a complete understanding of the fracture morphology is obtained only after surgical exposure.

Radiographic findings

Isolated lateral orbital wall fractures are rare and only occur after isolated trauma to this anatomical structure. Much more common is a lateral orbital wall fracture together with a zygoma fracture (as shown).

Lateral orbital wall fracture