Idiopathic infectious arthritis of the coxofemoral joint in a mature horse
Authors: Woodford N. S., Puzio J., Parker R. D.
Journal: Equine Veterinary Education
Summary
# Editorial Summary Infectious arthritis of the hip (coxofemoral) joint remains exceptionally rare in adult horses, with only one prior case documented in the equine literature before this 2017 report. A mature horse presented with proximal hindlimb pain and elevated serum amyloid A levels, prompting investigation that ultimately revealed infected synovial fluid on ultrasound-guided joint aspiration, confirmed through diagnostic imaging showing increased radiopharmaceutical uptake at the coxofemoral joint. Notably, despite the chronic nature of the condition at presentation, conservative (non-surgical) management enabled the horse to resume light work, suggesting that idiopathic hip joint infections may not necessarily require surgical intervention in all cases. For equine practitioners, this case reinforces the importance of considering coxofemoral involvement in horses with proximal hindlimb lameness and elevated acute phase proteins, and demonstrates that ultrasound-guided aspiration remains a valuable diagnostic tool for deep joint infections that may otherwise be missed on routine radiography alone. The rarity of this condition warrants continued case documentation to better understand its aetiology, progression, and optimal management strategies in the adult horse population.
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Practical Takeaways
- •Consider coxofemoral joint infectious arthritis in mature horses presenting with proximal limb pain and elevated acute phase proteins, even though it is rare.
- •Ultrasound-guided synovial fluid aspiration is a valuable diagnostic tool for confirming septic arthritis when synovial infection is suspected.
- •Non-surgical management may be a viable option for coxofemoral joint infection in mature horses, though prognosis depends on individual case factors.
Key Findings
- •Idiopathic infectious arthritis of the coxofemoral joint is a rare condition in mature horses with only one previously published case.
- •Elevated serum amyloid A (major acute phase protein) was diagnostic indicator that led to identification of infected synovial fluid via ultrasound-guided aspiration.
- •Non-surgical treatment enabled the affected horse to return to previous modest level of activity despite chronic nature of condition.
- •Scintigraphy (nuclear medicine imaging) showed subtle increased radiopharmaceutical uptake at the coxofemoral joint as a localizing diagnostic aid.