Equine articular synovial cysts: 16 cases.
Authors: Lacourt Mathieu, MacDonald Melinda, Rossier Yves, Laverty Sheila
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Equine Articular Synovial Cysts Articular synovial cysts represent an uncommon cause of lameness in horses, yet their clinical presentation and optimal management strategy have received limited attention in the literature. This retrospective analysis examined 16 horses diagnosed with such cysts across two veterinary teaching hospitals over a 21-year period, documenting clinical presentation, diagnostic approach, and treatment outcomes through imaging (radiography, ultrasonography, and arthrography) combined with physical examination findings. Of the horses where surgical excision was attempted (8 cases), three of four with available follow-up data returned to soundness, whilst two horses managed conservatively completed their careers satisfactorily—a notably positive outcome given the condition's location and potential for recurrence. The consistent identification of synovial epithelial lining in examined cysts suggests these lesions have a true synovial origin rather than representing simple joint effusion pockets, which carries implications for their aetiology and behaviour. For practitioners encountering persistent, localised lameness unresponsive to conventional joint treatment, articular synovial cysts warrant consideration in the differential diagnosis; whilst surgical excision offers a reasonable chance of functional recovery in appropriate cases, conservative management remains a viable option for horses where surgery is declined or contraindicated.
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Practical Takeaways
- •Articular synovial cysts are rare but should be considered in lameness cases; multimodal imaging (radiography, ultrasound, arthrography) improves diagnostic accuracy
- •Surgical excision shows promise for lameness resolution, but conservative management may also be viable for selected horses
- •Both surgical and conservative approaches can allow horses to return to work, so treatment selection should be individualized
Key Findings
- •Lameness was the primary clinical presentation in 56% (9/16) of horses with articular synovial cysts
- •Diagnosis required combination of palpation, radiography, ultrasonography and/or arthrography
- •Surgical excision resolved lameness in 3 of 4 surgically treated horses with outcome data available
- •Conservative treatment resulted in satisfactory performance in 2 horses for remainder of career