Osteoarthritis of one of the joints within the hock (the talocalcaneal joint) is a rare cause of acute onset of severe lameness, but clinical findings and diagnostic analgesia (such as blocking a joint) often fail to identify precisely the site of pain. Roger Smith, MA, VetMB, PhD, DEO, Dipl. ECVS, MRCVS, professor of equine orthopedics in the Department of Veterinary Clinical Science at the

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