Osseous abnormalities associated with collateral desmopathy of the distal interphalangeal joint. Part 2: treatment and outcome.
Authors: Dakin S G, Dyson S J, Murray R C, Newton R
Journal: Equine veterinary journal
Summary
Collateral ligament (CL) injuries at the distal interphalangeal joint represent a significant source of chronic foot lameness, yet long-term prognostic data remain scarce. Dakin and colleagues retrospectively analysed MRI images from 313 feet to characterise osseous abnormalities associated with CL desmopathy and evaluate whether bone involvement altered recovery prospects; treatment modalities including extracorporeal and radial pressure wave therapies were also assessed. Only 27–34% of horses with isolated or mild-to-moderate CL-related bone lesions returned to their previous performance level within the follow-up period (up to 2 years), with substantially poorer outcomes when multiple soft tissue and osseous structures were concurrently affected. Critically, neither ECSWT nor RPWT demonstrated therapeutic benefit in this cohort, and mild to moderate osseous changes did not meaningfully worsen prognosis relative to ligament injury alone. For practitioners, these findings emphasise the guarded long-term outlook for CL desmopathy regardless of imaging findings, the importance of thoroughly evaluating for concurrent pathology to establish realistic client expectations, and the need to question the evidence base for shock wave therapies in this specific condition.
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Practical Takeaways
- •Horses with isolated collateral ligament injuries have a poor overall prognosis for return to performance (27%), regardless of mild to moderate bone involvement—set realistic owner expectations
- •The presence of concurrent injuries to multiple structures in the hoof (soft tissue and bone) significantly worsens outcomes; thorough imaging is essential for prognostication
- •Shock wave or pressure wave therapies showed no benefit in this study and should not be relied upon as a treatment modifier for collateral ligament disease
Key Findings
- •27% of horses with collateral ligament injury alone and 34% with associated osseous injury returned to previous performance levels
- •Mild to moderate osseous injury related to collateral ligament does not significantly worsen prognosis compared to ligament injury alone
- •Prognosis was substantially worse when multiple soft tissue and osseous structures within the hoof capsule were injured
- •Neither extracorporeal shock wave therapy nor radial pressure wave therapy improved outcome in this cohort