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Selected Publication:

Type of publication: Doctoral Thesis
Type of document:

Year: 2005

Authors: Schlacher, C

Title: Kinematische und kinetische Untersuchung der biomechanischen Eigenschaften der thorakolumbalen Wirbelverbindungen beim Pferd - eine in-vitro Untersuchung.

Source: Dissertation, Vet. Med. Univ. Wien, pp. 25.

Advisor(s):

Peham Christian


Abstract:
The cause of back pain in horses is a topic of growing interest. In order to determine the stiffness of the isolated equine thoracolumbar spine an in vitro study was performed. Fourteen spines were dissected free from muscle, leaving the joints and ligaments intact. The specimens were then tested in a tensile testing machine. Each spine was fixed in three different positions simulating dorsoventral, laterolateral and 30° rotated dorsoventral movement. Force was applied on the dorsal spinous process of T12 to reach an excursion of 4 cm in each direction. The normal distribution of the stiffness coefficients was tested with the Kolmogorov-Smirnov test and the stiffness coefficients were compared using paired t-tests. The mean dorsoventral stiffness from 0 to 2 cm was 2093 N/m (SD 611) for the non-rotated spine and 2182 N/m (SD 459) for the 30° rotated spine. From 2 cm to 4 cm the mean dorsoventral stiffness was 6186 N/m (SD 386) for the non-rotated spine and 5069 N/m (SD 442) for the 30° rotated spine. Mean lateral stiffness was significantly lower than dorsoventral stiffness at 1454 N/m (SD 156). This leads to the conclusion that the stiffness of the spine depends on the direction of loading, with lateral stiffness being lowest. These results are consistent with findings of in vivo studies of equine back movement, where the range of physiological lateral movement was larger than the range of dorsoventral movement.

Keywords:
horse / stiffness / elasticity / equine back / thoracolumbar spine / T12


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