Systemic or intrasynovial medication as singular or as combination treatment in horses with (peri-)synovial pain.
Authors: Brommer H, Schipper P, Barneveld A, van Weeren P R
Journal: The Veterinary record
Summary
# Editorial Summary Between 2004 and 2007, Brommer and colleagues retrospectively analysed treatment outcomes in 104 lame horses presenting with synovial or perisynovial pain affecting three common sites: the metacarpophalangeal joint (MCPJ, n=53), digital flexor tendon sheath (DFTS, n=20), and distal interphalangeal joint (DIPJ, n=31). Three treatment approaches were compared—systemic NSAIDs alone (n=40), intrasynovial glucocorticosteroid injections alone (n=30), and combined systemic and intrasynovial therapy (n=34)—with success defined as return to previous performance level within six months. Combination therapy significantly outperformed monotherapy, achieving successful outcomes in 55.9% of cases versus only 27.5% with NSAIDs alone and 26.6% with intrasynovial steroids alone. The anatomical location of the lesion also proved influential: horses with MCPJ and DFTS involvement were substantially more likely to respond successfully (4–5.6 times higher odds) compared to those with DIPJ pathology. These findings suggest that practitioners should seriously consider dual-modality treatment for periarticular and tendon sheath conditions, particularly when addressing proximal structures, though the consistently lower success rates overall underline the need for rigorous diagnostic imaging, appropriate case selection, and potentially alternative or adjunctive interventions where combination therapy fails.
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Practical Takeaways
- •Combining systemic NSAIDs with intrasynovial glucocorticosteroid injection significantly improves treatment success for synovial pain conditions compared to either approach alone—consider combination therapy as first-line treatment
- •MCPJ and DFTS lesions respond much better to treatment than DIPJ involvement; set more conservative expectations and prognosis when DIPJ is affected
- •Over half of horses receiving combination therapy return to previous performance within six months, making this a worthwhile treatment investment for suitable cases
Key Findings
- •Combination treatment (systemic NSAIDs + intrasynovial glucocorticosteroids) achieved 55.9% success rate versus 27.5% for systemic NSAIDs alone and 26.6% for intrasynovial glucocorticosteroids alone (P = 0.021)
- •MCPJ and DFTS involvement showed 4-5 times higher success rates compared to DIPJ involvement (OR 4.18 and 5.59 respectively, P = 0.025)
- •Success was defined as return to previous level of performance within six months post-treatment