Equine Orthopaedic Research Center, Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado 80523, USA.
Pressure algometry for the detection of induced back pain in horses: a preliminary study
Version of Record online: 5 JAN 2010
2006 EVJ Ltd
Equine Veterinary Journal
Volume 38, Issue 1, pages 76–81, January 2006
How to Cite
HAUSSLER, K. K. and ERB, H. N. (2006), Pressure algometry for the detection of induced back pain in horses: a preliminary study. Equine Veterinary Journal, 38: 76–81. doi: 10.2746/042516406775374225
- Issue online: 5 JAN 2010
- Version of Record online: 5 JAN 2010
- Paper received for publication 18.04.05; Accepted 01.07.05
- pressure algometry;
- mechanical nociceptive thresholds;
- back pain;
- thoracolumbar spine;
- dorsal spinous processes
Reasons for performing study: Pressure algometry (PA) is a potential modality for objectively measuring mechanical nociceptive thresholds (MNTs) in horses. Its ability to differentiate musculoskeletal pain sites from nonpain sites is unknown and must be assessed prior to its clinical application.
Objectives: To assess the ability of PA to detect induced musculoskeletal pain.
Methods: Twenty clinically normal mature horses (2 groups of 10 horses, over 2 years) were used to measure MNTs before and after implantation and removal of 2 fixation half-pins in the dorsal spinous processes of 2 adjacent vertebrae. To assess hyperalgesia, MNTs near the surgical sites were pooled and compared to surrounding landmarks. MNTs were also compared on 2 consecutive days immediately after surgical implantation. To assess longer-term adaptation or sensitisation, changes from the beginning to the end of the study were evaluated.
Results: The precise surgical sites could be recognised due to substantial and localised decreases in the MNTs compared with surrounding landmarks. At most sites distant to the surgical sites, the distribution of the median percentage change in MNTs was centred around 0 (suggesting unbiased repeatability). MNTs compared from the beginning to the end of this study did not demonstrate obvious adaptation or sensitisation.
Conclusions and potential relevance: PA provides a quantitative and repeatable method for assessing the presence of musculoskeletal pain. Further studies are needed to evaluate PA clinically for assessing musculoskeletal injuries and pain management strategies in horses.