Radiographic and scintigraphic evaluation of spondylosis in the equine thoracolumbar spine: a retrospective study.
BACKGROUND
Clinical, radiographic and scintigraphic signs associated with spondylosis of the equine thoracolumbar spine have been poorly documented.


OBJECTIVE
To establish an objective radiographic and scintigraphic grading system for spondylosis lesions; to estimate the prevalence of spondylosis in a population of horses with back pain; and to compare the results of radiography and scintigraphy.


METHODS
Radiographic images of the thoracolumbar spine from 670 horses with clinical signs of back pain were graded. Scintigraphic images from horses with spondylosis lesions underwent subjective and objective analysis. Sensitivity and specificity of scintigraphy for detection of spondylosis relative to radiography for identification of spondylosis were calculated, and Chi-squared analysis was performed to test for an association between location and severity of lesions.


RESULTS
Twenty-three of 670 horses (3.4%) with back pain had radiographic evidence of spondylosis. Of these horses, 14 (61%) had more than one lesion and 44% (n=22) of lesions occurred between T11-T13 vertebral bodies. Only 33% (n=28) of locations with radiographic changes had increased radiopharmaceutical uptake.


CONCLUSIONS
Spondylosis occurs at a low prevalence in horses with back pain. It may be present alone or in association with other osseous abnormalities. The clinical significance of spondylosis needs further investigation.


CONCLUSIONS
Spondylosis is uncommon but may be a contributor to back pain in the horse.
Meehan
L
L
Centre for Equine Studies, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU, UK.
Dyson
S
S
Murray
R
R
D000818:Animals; D006734:Horse Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D006736:Horses; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D011877:Radionuclide Imaging / Q000662:veterinary*; D012189:Retrospective Studies; D013131:Spine / Q000000981:diagnostic imaging*; D055009:Spondylosis / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000662:veterinary*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology