Abstract
Most kittens have an obvious limb deformity at birth, characterized by shortening and varus deformity at the level of the carpus. The radial and ulnar carpal bones articulate with the distal radius and styloid process of the ulna to form the antebrachiocarpal joint. The accessory carpal bone articulates with the palmar surface of the ulnar carpal bone and serves as the insertion point for the flexor carpi ulnaris muscle. Hyperextension injuries to the feline carpus are uncommon. The trauma causes tearing of the palmar carpal fibrocartilage and palmar ligaments. Injury to any or all of the antebrachiocarpal, middle carpal or carpometacarpal joints can occur. Typically the medial aspect of the carpus and metacarpus is abraded by the pavement, removing variable amounts of skin, muscle, tendon, ligament and bone. Indications include luxation, hyperextension, debilitating osteoarthritis of the antebrachiocarpal joint, shearing injuries with significant loss of articular cartilage and postural deformity resulting from radial nerve paralysis.
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