A review of tendon injury: why is the equine superficial digital flexor tendon most at risk?
Authors: Thorpe C T, Clegg P D, Birch H L
Journal: Equine veterinary journal
Summary
# Editorial Summary Tendon injury represents a significant cause of career-ending wastage in performance horses, yet the risk is not distributed evenly across the forelimb's musculotendinous structures—the superficial digital flexor tendon (SDFT) is disproportionately affected whilst injuries to the common digital extensor tendon remain comparatively rare. Thorpe, Clegg and Birch's 2010 review synthesises epidemiological data and biomechanical evidence to examine why the SDFT is uniquely vulnerable, exploring both the functional demands placed upon this structure and the anatomical and material properties that render it susceptible to failure. The authors identify that understanding the cascade of matrix degeneration—from initial collagen and proteoglycan changes through to gross structural failure—is essential for developing evidence-based interventions. By contextualising the SDFT's biomechanical role within the broader architecture of the equine forelimb, the review provides a framework for practitioners to appreciate how training load, conformation, age and intrinsic material properties interact to drive injury risk. These insights have direct relevance for farriers, veterinarians and conditioning professionals seeking to implement targeted preventative strategies and inform realistic rehabilitation timelines for horses with tendon injuries.
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Practical Takeaways
- •SDFT injuries dominate equine tendon wastage; prevention strategies should prioritize this structure in performance horses
- •Gross tendon rupture is preceded by matrix-level degeneration, creating opportunities for early detection and intervention before clinical failure
- •The biomechanical role and loading patterns of the SDFT relative to other forelimb tendons explain why it fails more often—tailor conditioning and management accordingly
Key Findings
- •Tendon injury is one of the most common causes of wastage in performance horses
- •The superficial digital flexor tendon (SDFT) is injured far more frequently than other forelimb tendons such as the common digital extensor
- •Matrix degeneration precedes gross tendon failure and is key to understanding injury mechanisms
- •Understanding the different biomechanical functions of forelimb tendons explains differential injury rates