Close, impinging and overriding spinous processes in the thoracolumbar spine: the relationship between radiological and scintigraphic findings and clinical signs.

The research paper examines the relationship between back pain in horses and specific spino-lumbar conditions detected by radiology and scintigraphy. The comprehensive study also determines the prevalence of concurrent skeletal pathology within the animals.

Research Objective and Method

• The principal objective of this research was to investigate the correlation between clinical signs of back pain in horses and specific radiological findings. These findings include detection of closely placed, impinging or overriding spinous processes (SPs), detection of increased radiopharmaceutical uptake (IRU) in the SPs, and finally a combination of both the radiological findings and IRU.
• The study aimed to determine the prevalence of concurrent osseous (bone) pathologies occurring simultaneously with the SP conditions.
• The comprehensive study involved 582 horses presented with perceived back pain and poor performance. They underwent detailed clinical investigation including pain relief therapy testing on the forelimbs, hindlimbs, back and sacroiliac joints.
• Both radiographic and scintigraphic examinations of the thoracolumbar spine (the part of the spine that extends from the bottom of the ribs to the small of the back) were carried out.

Results

• Findings revealed a higher representation of Thoroughbred horses with thoracolumbar pain as compared to Warmbloods and Thoroughbred crossbreeds.
• The research showed significant associations between the severity and extent of thoracolumbar pain and radiological grades of the SPs, grades of IRU, and a combination of both.
• Horses with osteoarthritis (OA) in the synovial intervertebral articulations (SIAs)—the joints between the vertebrae—were more susceptible to thoracolumbar pain. This was especially true when OA was present along with lesions of the SPs.

Conclusions

• This study indicates that pain in the fore or hindlimbs and/or pain linked to the sacroiliac joints can mimic primary thoracolumbar pain, confusing identification of the primary source of back pain for the horse.
• Thus, employing a combination of radiology and scintigraphy aids accurate prediction of thoracolumbar pain. However, the study also stresses the importance of diagnostic analgesia for precise diagnosis of the pain source.