Nuclear scintigraphic assessment of the thoracolumbar synovial intervertebral articulations.

Authors: Gillen A, Dyson S, Murray R

Journal: Equine veterinary journal

DOI: 10.2746/042516409x376940 PubMed: 19803047Log in to save

Summary

# Editorial Summary Gillen et al. (2009) sought to develop an objective scintigraphic grading system for thoracolumbar facet joints and determine whether increased radiopharmaceutical uptake (IRU) correlates with clinical back pain—a relationship previously underdocumented in the equine literature. Using nuclear scintigraphy of the T13–L1 region in 31 clinically normal working horses and 65 horses presenting with thoracolumbar pain and radiographic facet joint osteoarthritis, the researchers compared subjective visual assessment with objective region-of-interest analysis and correlated findings with radiographic changes. Moderate to intense IRU occurred exclusively in the back-pain group (61.5% prevalence versus 25.8% in sound horses), with the strongest associations between scintigraphic findings and radiographic abnormalities appearing in horses demonstrating intense uptake. These results suggest nuclear scintigraphy offers practitioners a sensitive imaging modality for identifying active facet joint pathology in horses presenting with back pain, particularly when moderate or intense uptake is demonstrated. Given the high concordance between subjective and objective grading (96.7%), the technique may provide valuable diagnostic clarity when radiography alone proves inconclusive in evaluating chronic or subtle thoracolumbar dysfunction.

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Practical Takeaways

•Nuclear scintigraphy is a useful diagnostic tool for horses presenting with thoracolumbar pain, particularly when moderate-to-intense uptake patterns are observed
•Moderate or intense radiopharmaceutical uptake in facet joints is highly suggestive of back pain and should prompt clinical correlation and treatment planning
•The objective scintigraphic grading system provides a standardized, reproducible method for assessing facet joint pathology across different cases and clinicians

Key Findings

•Objective scintigraphic grading matched subjective visual assessment in 96.7% of cases, establishing a reliable grading system for facet joint evaluation
•Increased radiopharmaceutical uptake was present in 61.5% of horses with back pain versus 25.8% of clinically normal horses
•Moderate or intense IRU was exclusively observed in horses with clinical back pain (Group B), not in clinically normal horses
•Strongest association between radiographic abnormalities and scintigraphic findings occurred in horses with intense IRU

Conditions Studied

thoracolumbar region painfacet joint osteoarthritisback pain

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