Abstract
ABSTRACT The purpose of this paper is to describe a case of a right zygomatic arch fracture in a 5-year-old male Labrador Retriever diagnosed with aid of 3D Computed Tomography reconstruction. Because of the depressed fracture and interference with the eyeball, surgical repair of the right zygomatic arch fracture was performed with open reduction and stabilization with an 11-hole, 2.7mm Veterinary Cuttable Plate. Radiographs taken 60 days after surgery revealed that fracture healing occurred without complications with improved function and cosmetic appearance. Ninety days after surgery the patient was clinically discharged.
Highlights
Skull fractures in dogs can be related to concurrent trauma to the brain, eyes, and both oral and nasal cavities and may result in loss of support for the orbit, damage to the eye or associated structures (Gruss, 1990)
The central structure of the zygomatic arch passes lateral to the vertical ramus of the mandible and if fractured may depress into the mandible and alter mastication while caudal fractures may interfere with the function of the mandibular condyles (Boudrieau & Kudisch, 1996)
The only diagnostic imaging modality available to assess animals with maxillofacial fractures was conventional radiographic exam; the skull is a difficult area to study radiographically due to its very complex bone structure which leads to superimposition of important structures and makes detailed examination of individual parts difficult
Summary
Macedo and Moens displaced zygomatic fractures can often be treated conservatively, depressed fractures and those compromising function or threatening ocular or neurovascular structures should be reduced and stabilized (Boudrieau, 2012). This paper reports a case of right zygomatic arch fracture in a 5-year-old male Labrador Retriever, diagnosed through 3D CT reconstruction treated surgically with Veterinary Cuttable Plates. The CT images and 3D reconstruction of the images revealed a segmental fracture of the right maxillary and rostral part of the zygomatic bone with a medially displaced fragment interfering with the eyeball (Figure 1). A small incision was made at the attachment of the masseter muscle to the zygomatic arch at the level of the fractured fragment and a periosteal elevator was carefully placed from ventrally along the medial aspect of the displaced fragment. The implant was stable and evidence of fracture healing was observed, radiographic examination is hard to assess due to bone overlapping (Figure 3A, 3B). The implant was stable and no further radiographs were taken, the patient was clinically discharged
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