Unilateral synostosis of the zygomaticotemporal suture associated with mandibular coronoid process impingement in a dog

J. M. Ryan; E. Fraga-Manteiga; T. Schwarz; D. N. Clements

doi:10.3415/VCOT-12-12-0157

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2013; 26(05): 421-424
DOI: 10.3415/VCOT-12-12-0157

Case Report

Schattauer GmbH

Unilateral synostosis of the zygomaticotemporal suture associated with mandibular coronoid process impingement in a dog

J. M. Ryan

¹Royal (Dick) School of Veterinary Studies, Division of Clinical Sciences, The University of Edinburgh, Hospital for Small Animals, Roslin, Midlothian, Scotland

,

E. Fraga-Manteiga

¹Royal (Dick) School of Veterinary Studies, Division of Clinical Sciences, The University of Edinburgh, Hospital for Small Animals, Roslin, Midlothian, Scotland

,

T. Schwarz

¹Royal (Dick) School of Veterinary Studies, Division of Clinical Sciences, The University of Edinburgh, Hospital for Small Animals, Roslin, Midlothian, Scotland

,

D. N. Clements

¹Royal (Dick) School of Veterinary Studies, Division of Clinical Sciences, The University of Edinburgh, Hospital for Small Animals, Roslin, Midlothian, Scotland

²The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland

› Author Affiliations

Abstract

Summary

A 13-month-old dog was investigated for the complaint of open-mouth locked jaw. There were not any previous episodes of trauma witnessed. Computed tomographic evaluation revealed unilateral zygomaticotemporal synostosis and associated craniofacial asymmetry, with impingement of the mandibular coronoid process resulting in unilateral temporomandibular joint subluxation. Closed reduction of the subluxation was not maintained. Partial zygomaticotemporal suturectomy resulted in resolution of the clinical signs. To the author's knowledge, isolated zygomaticotemporal synostosis with associated temporomandibular subluxation has not been reported in the dog.

Keywords

Zygomaticotemporal - suture - synostosis - dog - temporomandibular

Full Text

References

References
1 McGeady TA, Quinn PJ, FitzPatrick ES. et al. Structures in the Head and Neck. In: McGeady TA. editor. Veterinary Embryology. Oxford: Blackwell; 2006. p. 2006-282.
2 Kokich VG. Age changes in the human frontozygomatic suture from 20 to 95 years. Am J Orthod 1976; 69: 411-430.
3 Evans HE. Arthrology. In: Evans HE. editor. Miller's Anatomy of the Dog. Philadelphia: Saunders; 1993. p. 221.
4 Vollmerhaus B, Freiwein J, Roos H. et al. Neurocranium. In: Freiwein J, Vollmerhaus B. editors. Anatomie von Hund und Katze [Anatomy of Dogs and Cats]. Berlin: Blackwell; 1994. p. 1994-8.
5 Evans HE. The Skeleton. In: Evans HE. editor. Miller's Anatomy of the Dog. Philadelphia: Saunders; 1993. p. 152.
6 Coulsen A, Lewis N. Skull. In: Coulsen A, Lewis N. editors. An atlas of interpretative radiographic anatomy of the dog and cat. Oxford: Blackwell; 2002. p. 2002-146.
7 Maloul A, Fialkov J, Hojjat S-P. et al. A technique for the quantification of the 3D connectivity of thin articulations in bony sutures. J Biomech 2010; 43: 1227-1230.
8 Rogers GF, Greene AK, Oh AK. et al. Zygomaticotemporal synostosis: A rare cause of progressive facial asymmetry. Cleft Palate Craniofac J. 2007; 44: 106-111.
9 Sullivan SR, Greene AK, Mulliken JB. et al. Zygomaticotemporal suture synostosis causes progressive facial deformity and asymmetry. Plast Reconstr Surg 2009; 123: 146e-147e.
10 Gatineau M, El-Warrak AO, Marretta SM. et al. Locked jaw syndrome in dogs and cats: 37 cases (1998-2005). J Vet Dent 2008; 25: 16-22.
11 Schwarz T, Weller R, Dickie AM. et al. Imaging of the canine and feline temporomandibular joint: A review. Vet Radiol Ultrasound 2002; 43: 85-97.
12 Robins G, Grandage J. Temporomandibular joint dysplasia and open-mouth jaw locking in the dog. J Am Vet Med Assoc 1977; 171: 1072-1076.
13 Stewart WC, Baker GJ, Lee R. Temporomandibular subluxation in the dog: A case report. J Small Anim Pract 1975; 16: 345-349.
14 Soukup JW, Snyder CJ, Gengler WR. Computed tomography and partial coronoidectomy for open-mouth jaw locking in two cats. J Vet Dent 2009; 26: 226-233.
15 Piermattei DL, Flo GL, DeCamp CE. Fractures and luxations of the mandible and maxilla. In: Piermattei DL, Flo GL, DeCamp CE. editors. Handbook of Small Animal Orthopedics and Fracture Repair. 4 ed. Missouri: Saunders; 2006. p. 2006-730.
16 Hazewinkel HAW, Koole R, Voorhout G. Mandibular coronoid process displacement: signs, causes, treatment. Vet Comp Orthop Traumatol 1993; 6: 29-35.
17 Lantz GC, Cantwell HD. Intermittent open-mouth lower jaw locking in five dogs. J Am Vet Med Assoc 1986; 188: 1403-1405.
18 Bennett D, Campbell JR. Mechanical interference with lower jaw movement as a complication of skull fractures. J Small Anim Pract 1976; 17: 747-751.
19 Piermattei DL, Johnson KA. Approach to the Temporomandibular Joint. In: Piermattei DL. editor. An Atlas of Surgical Approaches to the Bones and Joints of the Dog and Cat. Philadelphia: Saunders; 2004. p. 2004-40.
20 Monteiro BP, Gibson T, Bratton A. Sucessful surgical treatment of mandibulo-zygomatic arch synostosis secondary to trauma in a dog. Can Vet J 2012; 53: 395-398.
21 Watzek G, Grundschober F, Plenk jr H. et al. Experimental investigations into the clinical significance of bone growth at viscerocranial sutures. J Maxillofac Surg 1982; 10: 61-79.
22 Rafferty KL, Herring SW, Artese F. Three-dimensional loading and growth of the zygomatic arch. J Exp Biol 2000; 203: 2093-2104.