Biomechanical analysis of torsion and shear forces in lumbar and lumbosacral spine segments of nonchondrodystrophic dogs

Hediger, Katharina Ursula; Ferguson, Stephen J; Gedet, Philippe; Busato, Andre; Forterre, Franck; Isler, Samuel; Barmettler, Reto; Lang, Johann (2009). Biomechanical analysis of torsion and shear forces in lumbar and lumbosacral spine segments of nonchondrodystrophic dogs. Veterinary surgery, 38(7), pp. 874-80. Oxford: Wiley-Blackwell 10.1111/j.1532-950X.2009.00582.x

[img] Text
HEDIGER_et_al-2009-Veterinary_Surgery.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (713kB) | Request a copy

OBJECTIVE: To determine stiffness and load-displacement curves as a biomechanical response to applied torsion and shear forces in cadaveric canine lumbar and lumbosacral specimens. STUDY DESIGN: Biomechanical study. ANIMALS: Caudal lumbar and lumbosacral functional spine units (FSU) of nonchondrodystrophic large-breed dogs (n=31) with radiographically normal spines. METHODS: FSU from dogs without musculoskeletal disease were tested in torsion in a custom-built spine loading simulator with 6 degrees of freedom, which uses orthogonally mounted electric motors to apply pure axial rotation. For shear tests, specimens were mounted to a custom-made shear-testing device, driven by a servo hydraulic testing machine. Load-displacement curves were recorded for torsion and shear. RESULTS: Left and right torsion stiffness was not different within each FSU level; however, torsional stiffness of L7-S1 was significantly smaller compared with lumbar FSU (L4-5-L6-7). Ventral/dorsal stiffness was significantly different from lateral stiffness within an individual FSU level for L5-6, L6-7, and L7-S1 but not for L4-5. When the data from 4 tested shear directions from the same specimen were pooled, level L5-6 was significantly stiffer than L7-S1. CONCLUSIONS: Increased range of motion of the lumbosacral joint is reflected by an overall decreased shear and rotational stiffness at the lumbosacral FSU. CLINICAL RELEVANCE: Data from dogs with disc degeneration have to be collected, analyzed, and compared with results from our chondrodystrophic large-breed dogs with radiographically normal spines.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Evaluative Research into Orthopaedic Surgery
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic > Small Animal Clinic, Surgery
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Clinical Radiology
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic

UniBE Contributor:

Hediger, Katharina Ursula; Ferguson, Stephen John; Gédet, Philippe; Busato, André; Forterre, Franck; Barmettler, Reto and Lang, Johann

Subjects:

600 Technology > 630 Agriculture

ISSN:

0161-3499

Publisher:

Wiley-Blackwell

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 15:10

Last Modified:

21 Apr 2015 12:52

Publisher DOI:

10.1111/j.1532-950X.2009.00582.x

PubMed ID:

19781031

Web of Science ID:

000270183000012

BORIS DOI:

10.7892/boris.30855

URI:

https://boris.unibe.ch/id/eprint/30855 (FactScience: 195194)

Actions (login required)

Edit item Edit item
Provide Feedback