Relationship between scintigraphic and radiographic evaluations of spinous processes in the thoracolumbar spine in riding horses without clinical signs of back problems.
BACKGROUND
Radiography and scintigraphy are used to aid diagnosis of the cause of back pain, but a large variation in appearance and radiopharmaceutical uptake in fully functioning horses make diagnosis difficult.


OBJECTIVE
To describe the range of and compare scintigraphic and radiographic findings in the spinous processes of horses without clinical signs of back problems.


METHODS
Thirty-three apparently normal riding horses underwent scintigraphic and radiographic examinations of the spinous processes in the thoracolumbar spine. Scintigraphic images were evaluated in a continuous blue, green and red colour scale, and the level of radiopharmaceutical uptake in the spinous processes from T10-L2 was graded into none, mild, moderate or severe increased radiopharmaceutical uptake. Structural changes along the borders of the spinous processes and the width of the interspinous spaces from T10-L2 were recorded.


RESULTS
Only 7 horses had no scintigraphic or radiographic findings. Nine horses had no increased radiopharmaceutical uptake, 17 had no sclerosis, 21 had no radiolucencies and 11 had normal spacing of the spinous processes (>4 mm wide). The majority of findings in 26 horses were located from T13-18 and were mild.


CONCLUSIONS
The findings of a wide spectrum of scintigraphic and radiographic changes leads to the conclusion that changes within this range found in affected horses cannot be interpreted as clinically significant.


CONCLUSIONS
To determine whether scintigraphy and/or radiography can be used to separate horses with back pain from horses without clinical signs, the results from this study should be compared to the scintigraphic and radiographic findings in horses with clinical signs.
Department of Companion Animal Clinical Sciences, Norwegian School of Veterinary Science, 0033 Oslo, Norway.
C
C
Erichsen
P
P
Eksell
K Roethlisberger
KR
Holm
P
P
Lord
C
C
Johnston
D000704:Analysis of Variance; D000818:Animals; D001416:Back Pain / Q000000981:diagnostic imaging / Q000662:veterinary*; D005260:Female; D006734:Horse Diseases / Q000000981:diagnostic imaging*; D006736:Horses; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008297:Male; D011237:Predictive Value of Tests; D011859:Radiography; D011877:Radionuclide Imaging; D012016:Reference Values; D013669:Technetium Tc 99m Medronate; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging
D013669:Technetium Tc 99m Medronate