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The pastern is a part of the leg of a horse between the fetlock and the top of the hoof. It incorporates the long pastern bone (proximal phalanx) and the short pastern bone (middle phalanx), which are held together by two sets of paired ligaments to form the pastern joint (proximal interphalangeal joint).
Fetlock joint: the joint between the cannon bone and the pastern. Fetlock is the common name in horses, large animals, and sometimes dogs for the metacarpophalangeal and metatarsophalangeal joints (MCPJ and MTPJ). Although it somewhat resembles the human ankle in appearance, the joint is homologous to the ball of the foot.
Skeleton of the lower forelimb. Each forelimb of the horse runs from the scapula or shoulder blade to the third phalanx (coffin or pedal) bones. In between are the humerus (arm), radius (forearm), elbow joint, ulna (elbow), carpus (knee) bones and joint, large metacarpal (cannon), small metacarpal (splint), sesamoid, fetlock joint, first phalanx (long pastern), pastern joint, second phalanx ...
It forms the "forearm" of the horse along with the ulna. Ulna: caudal to the radius, it is fused to that bone in an adult horse. Shoulder joint (scapulohumeral joint): usually has an angle of 120-130 degrees when the horse is standing, which can extended to 145 degrees, and flexed to 80 degrees (such as when the horse is jumping an obstacle).
Correct Trimming and Shoeing: a good farrier will trim the horse's feet correctly, preserving the pastern-hoof angle, and will properly support the horse’s heels. Bandaging: using properly applied exercise bandages can help prevent the overextension of the fetlock.
The dislocation caused destruction of all of the supporting ligaments to the back of the fetlock and pastern joint, making the ankle unstable and requiring surgery. [4] Three days after the catastrophic injury Larry Bramlage, DVM, of Rood and Riddle performed a fetlock anthrodesis, fusing the bones to eliminate the fetlock joint.
Fairly commonly injured by horses doing fast work, the DDFT is round in cross section. Superficial digital flexor: Runs down the back of the leg, behind the carpus and cannon, branches below the fetlock and inserts into the distal side of the 1st phalanx and proximal side of the 2nd phalanx. Flexes the elbow, carpus and lower joints.
The bandage starts just below the knee or hock, and ends at the floor, protecting the cannon bone, tendons of the lower leg, fetlock, pastern, coronet, and heels of the horse. Some boot designs extend slightly above the knee and hock, offering protection to the joints in the event the horse bumps those on the sides of the trailer. [1]: 216 [8] [9]