Retrospective study of the effect of intra-articular treatment of osteoarthritis of the distal tarsal joints in 51 horses.
Authors: Labens R, Mellor D J, Voûte L C
Journal: The Veterinary record
Summary
Distal tarsal joint osteoarthritis remains a significant source of hindlimb lameness in horses, yet long-term outcome data following intra-articular treatment are limited. Labens and colleagues retrospectively evaluated 51 horses treated with either methylprednisolone acetate or triamcinolone acetonide, with or without hyaluronic acid, assessing lameness changes through owner telephone questionnaires and scintigraphic findings. Single injections of corticosteroid proved effective, with median improvement occurring within 56 days (P<0.0001) and no significant difference between the two corticosteroids used; notably, repeat injections did not yield additional benefit. Scintigraphic patterns predicted treatment response: horses exhibiting diffuse radiopharmaceutical uptake in the distal tarsal joints showed a tendency towards improvement (P=0.032), whereas focal uptake patterns did not. The discrepancy between early clinical improvement and longer-term outcomes—with only 38% of horses (13/34) reporting positive results at follow-up—highlights that whilst intra-articular corticosteroid injection provides short-term lameness relief, practitioners should counsel owners on realistic expectations and consider this intervention as part of a broader management strategy rather than a definitive solution for distal tarsal osteoarthritis.
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Practical Takeaways
- •Intra-articular corticosteroid injection is effective for improving lameness in distal tarsal joint osteoarthritis in the short term (56 days), with no advantage to adding hyaluronic acid or using a second injection
- •Scintigraphy findings may help predict treatment success: diffuse uptake patterns are more likely to respond than focal uptake patterns
- •Be cautious about long-term expectations—while initial improvement is significant, only about 38% of horses maintain positive outcomes at extended follow-up, suggesting need for discussion with owners about realistic timelines and potential need for alternative therapies
Key Findings
- •Horses treated once with methylprednisolone acetate or triamcinolone acetonide (with or without hyaluronic acid) improved significantly with median improvement at 56 days (P<0.0001)
- •No significant difference in efficacy between methylprednisolone acetate and triamcinolone acetonide treatments
- •No significant further improvement observed in horses receiving a second injection
- •Diffuse radiopharmaceutical uptake on scintigraphy predicted lameness improvement (P=0.032), whereas focal uptake did not
- •Only 13 of 34 horses (38%) had positive outcomes at long-term telephone follow-up, suggesting limited durability of treatment effects