Spontaneous bilateral ankylosis of the carpometacarpal joint in a Paint Horse
Authors: Oosterlinck M., Pille F., Gasthuys F., Saunders J. H.
Journal: Equine Veterinary Education
Summary
# Editorial Summary: Spontaneous Bilateral Carpometacarpal Ankylosis in an Adult Paint Horse An 8-year-old Paint Horse gelding presented with severe left forelimb lameness (grade 4/5) secondary to osteoarthritis of the carpometacarpal joint, evidenced by dorsomedial swelling unresponsive to systemic and local anti-inflammatory therapy. Rather than pursue the recommended partial carpal arthrodesis, the owner opted for conservative management combining strict paddock confinement and phytotherapeutic supplementation with *Harpagophytum procumbens* (devil's claw). Remarkably, the left limb lameness gradually resolved, though a similar swelling developed contralaterally; radiographic imaging 18 months post-presentation demonstrated spontaneous bilateral ankylosis of the carpometacarpal joints. This case demonstrates that severe carpal osteoarthritis may achieve functional recovery through natural joint fusion rather than surgical intervention, with conservative confinement potentially facilitating this process—a noteworthy outcome for practitioners counselling owners reluctant to pursue surgery, though it represents an unusual clinical course that warrants caution against assuming predictable results in similar presentations. The bilateral nature of the ankylosis also raises questions about systemic predisposition to carpal joint disease in this individual, relevant for breeding and long-term soundness management decisions.
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Practical Takeaways
- •Conservative management with stall confinement and phytotherapeutic supplementation may be considered as an alternative to surgical arthrodesis in selected carpal OA cases, though outcomes are unpredictable
- •Development of swelling on the contralateral limb warrants investigation even when the opposite side was initially clinically normal
- •Spontaneous ankylosis can result in functional recovery without surgical intervention, though this outcome cannot be guaranteed
Key Findings
- •An 8-year-old Paint Horse developed bilateral carpometacarpal ankylosis spontaneously over 1.5 years following conservative management with restricted exercise and Harpagophytum procumbens supplementation
- •Initial lameness grade 4/5 gradually resolved despite absence of surgical arthrodesis
- •Spontaneous ankylosis occurred bilaterally despite unilateral clinical presentation at initial examination