Carpometacarpal osteoarthritis in thirty-three horses.
Authors: Panizzi Luca, Barber Spencer M, Lang Hayley M, Carmalt James L
Journal: Veterinary surgery : VS
Summary
# Carpometacarpal Osteoarthritis in Horses: A Poor Prognosis Despite Treatment Carpometacarpal osteoarthritis (CMC-OA) is a debilitating condition affecting the articulation between the second metacarpal and carpal bones, yet it remains poorly understood in clinical practice. Panizzi and colleagues reviewed 33 horses diagnosed with CMC-OA over a 15-year period, documenting signalment, clinical presentation, radiographic findings and long-term outcomes through owner follow-up surveys. The condition predominantly affected middle-aged and older Quarter Horses and Arabians, manifesting as severe lameness with characteristic swelling centred over the affected joint site and radiographic evidence of proliferative bone formation, joint space narrowing and subchondral lysis. Amongst 20 horses with available follow-up data, conventional conservative treatment proved largely ineffective: seven of fourteen treated horses were euthanatized within four years, compared to four of five untreated horses within three years, with most owners reporting poor and short-lived responses to therapy. This case series suggests that CMC-OA carries a grave prognosis regardless of intervention, necessitating honest discussions with owners about realistic outcomes and the potential need for euthanasia, whilst highlighting an urgent need for investigation into alternative treatment modalities—whether surgical, regenerative or otherwise—for this seemingly breed-predisposed condition.
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Practical Takeaways
- •CMC-OA carries a poor prognosis with high euthanasia rates; early recognition based on swelling over the 2nd metacarpal/carpal bone articulation in middle-aged Quarter Horses and Arabians is important for managing owner expectations
- •Conservative treatment provides only short-term relief; discuss realistic long-term outcomes with owners early in the diagnosis process to allow informed decision-making about management options
- •This condition may warrant investigation of breed-specific predispositions and biomechanical factors in Quarter Horses and Arabians to inform preventive strategies
Key Findings
- •CMC-OA occurred predominantly in middle-aged and older Quarter Horses and Arabians, causing severe lameness that prevented normal use
- •Characteristic clinical swelling was centered over the 2nd metacarpal bone/2nd carpal bone articulation with radiographic evidence of proliferative new bone, narrowed joint space, and subchondral lysis
- •Of 20 horses with follow-up, 7 of 14 treated horses were euthanatized within 4 years and 4 of 5 nontreated horses within 3 years, indicating poor prognosis regardless of treatment
- •Response to conservative treatment was very poor and short-lived, with most owners dissatisfied with treatment outcomes