Localisation and outcome of presumed thoracolumbar vertebral stress fracture in 35 UK Thoroughbred racehorses using nuclear scintigraphy.
Authors: Chapple Alexander R, Daglish Jodie, Stover Susan M, Slipchenko Natalya, Phillips Kathryn L
Journal: Equine veterinary journal
Summary
# Editorial Summary Vertebral stress fractures represent a significant yet poorly characterised threat to racing Thoroughbreds, with most clinical knowledge derived from post-mortem examinations in Quarter horses rather than live diagnostic imaging. This retrospective study analysed nuclear scintigraphy scans from 35 UK Thoroughbred racehorses with suspected thoracolumbar vertebral stress fractures, establishing the imaging characteristics and anatomical distribution of lesions detectable ante-mortem. The researchers identified focal areas of increased radiopharmaceutical uptake predominantly affecting the caudal lumbar vertebrae, enabling specific localisation of stress-related bone remodelling that would otherwise remain undetected on conventional radiography. These findings provide farriers, veterinarians and trainers with practical diagnostic guidance for identifying at-risk horses during their racing careers, potentially preventing catastrophic fracture progression and improving welfare outcomes through earlier intervention and modified training protocols. The improved ante-mortem imaging characterisation of vertebral stress fractures fills a critical gap in the literature and establishes nuclear scintigraphy as an essential tool for diagnosing this performance-limiting and potentially fatal condition in racing Thoroughbreds.
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Practical Takeaways
- •Nuclear scintigraphy should be considered the imaging modality of choice when investigating unlocalised stress-related bone remodelling in racehorses
- •Veterinarians should suspect caudal lumbar vertebral stress fractures in racing Thoroughbreds with performance decline or unusual lameness patterns, as ante-mortem diagnosis is now possible
- •Early identification of vertebral stress fractures via scintigraphy may improve outcomes and reduce catastrophic injuries in affected racehorses
Key Findings
- •Nuclear scintigraphy successfully localised presumed thoracolumbar vertebral stress fractures in 35 UK Thoroughbred racehorses
- •Study provides first ante-mortem imaging characterisation of vertebral stress fractures in racing Thoroughbreds, previously only described post-mortem
- •Stress fractures of the caudal lumbar vertebral column represent an important cause of mortality and morbidity in racing Thoroughbreds