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Vet Comp Orthop Traumatol 2017; 30(06): 430-437
DOI: 10.3415/VCOT-17-03-0043
Original Research
Schattauer GmbH

Effect of Facetectomy on the Three-Dimensional Biomechanical Properties of the Fourth Canine Cervical Functional Spinal Unit: A Cadaveric Study

Nadja Bösch
1   Department of Clinical Veterinary Medicine, Small Animal Surgery, Vetsuisse Faculty, University of Berne, Berne, Switzerland
,
Martin Hofstetter
2   Kleintier-Spezialisten Klinik ARC, Herisau, Switzerland
,
Alexander Bürki
3   Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland
,
Beatriz Vidondo
4   Veterinary Public Health Institute, Schwarzenburgstrasse 155, CH-3097 Bern, Switzerland
,
Fenella Davies
1   Department of Clinical Veterinary Medicine, Small Animal Surgery, Vetsuisse Faculty, University of Berne, Berne, Switzerland
,
Franck Forterre
1   Department of Clinical Veterinary Medicine, Small Animal Surgery, Vetsuisse Faculty, University of Berne, Berne, Switzerland
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Publikationsverlauf

received 17. März 2017

accepted after revision 17. August 2017

Publikationsdatum:
04. Dezember 2017 (online)

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Abstract

Objective To study the biomechanical effect of facetectomy in 10 large breed dogs (>24 kg body weight) on the fourth canine cervical functional spinal unit.

Methods Canine cervical spines were freed from all muscles. Spines were mounted on a six-degrees-of-freedom spine testing machine for three-dimensional motion analysis. Data were recorded with an optoelectronic motion analysis system. The range of motion wasdetermined inall threeprimary motionsaswellasrange of motion of coupled motions on the intact specimen, after unilateral and after bilateral facetectomy. Repeated-measures analysis of variance models were used to assess the changes of the biomechanical properties in the three treatment groups considered.

Results Facetectomy increased range of motion of primary motions in all directions. Axial rotation was significantly influenced by facetectomy. Coupled motion was not influenced by facetectomy except for lateral bending with coupled motion axial rotation. The coupling factor (coupled motion/primary motion) decreased after facetectomy. Symmetry of motion was influenced by facetectomy in flexion–extension and axial rotation, but not in lateral bending.

Clinical Significance Facet joints play a significant role in the stability of the cervical spine and act to maintain spatial integrity. Therefore, cervical spinal treatments requiring a facetectomy should be carefully planned and if an excessive increase in range of motion is expected, complications should be anticipated and reduced via spinal stabilization.

Keywords

biomechanics - dogs - facetectomy - cervical
 

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