Oosterlinck, M.; Pille, F.; Gasthuys, F.; Saunders, J.H. Equine Veterinary Education September 2009 21 9 452-454(3) An 8-year-old Paint Horse gelding was evaluated for a persistent left forelimb lameness (grade 4/5), with a hard swelling at the dorsomedial aspect of the carpometacarpal joint, due to osteoarthritis. Previous systemic and local anti-inflammatory therapy had only a temporary effect. Partial carpal arthrodesis was suggested, but the owner elected for conservative treatment. The horse was confined to a small paddock and received phytotherapeutic supplementation with Harpagophytum procumbens. The lameness gradually resolved but a similar hard swelling developed on the right carpus. Radiographic follow-up 1.5 years later revealed a spontaneous bilateral ankylosis of the carpometacarpal joint.