Microdamage in the equine superficial digital flexor tendon.
Authors: O'Brien Claire, Marr Neil, Thorpe Chavaunne
Journal: Equine veterinary journal
Summary
The superficial digital flexor tendon (SDFT) in the equine forelimb represents a critical weak point in high-performance athletes, bearing the brunt of energy storage and recoil during galloping and jumping—yet remaining one of the most frequently injured structures in performance horses. O'Brien, Marr and Thorpe synthesised current evidence on how biomechanical and thermal strain progressively accumulate microdamage within the SDFT architecture, whilst examining how advancing age compounds this vulnerability through altered tissue response characteristics. Rather than reviewing treatment options, the authors emphasised that early subclinical detection and timely training modifications offer substantially greater clinical benefit than interventions applied post-injury, given tendon's notoriously slow healing and limited regenerative capacity. The review highlights available screening modalities and protocols that can identify degeneration during training programmes before functional lameness emerges, enabling farriers, veterinarians and coaches to implement targeted preventative strategies. For practitioners, this underscores the value of routine SDFT monitoring in performance horses—particularly as they age—and the importance of responding promptly to imaging or ultrasound findings that suggest early pathology, potentially extending competitive longevity and reducing costly rehabilitation periods.
Read the full abstract on PubMed
Practical Takeaways
- •Implement early screening protocols during training programmes to detect subclinical SDFT degeneration before clinical lameness develops
- •Adjust training intensity and duration based on age-related changes in tendon biomechanics to minimize cumulative microdamage
- •Focus on preventative strategies and early intervention rather than waiting for acute injury, as tendon tissue heals slowly and incompletely
Key Findings
- •The forelimb SDFT is highly susceptible to injury during galloping and jumping, making it one of the most common causes of lameness in performance horses
- •Biomechanical and biothermal strain effects accumulate as microdamage in the SDFT over time
- •Age-related alterations affect strain response and increase injury risk in tendons
- •Early detection and preventative training modifications are more effective than post-injury treatment due to slow tendon healing and poor regenerative capacity