Fetlock is the common name for the metacarpophalangeal and metatarsophalangeal joints (MCPJ and MTPJ) of the horse. It is formed by the junction of the third metacarpal (forelimb) or metatarsal (hindlimb) bones proximad and the proximal phalanx distad. Paired proximal sesamoid bones articulate with the palmar or plantar distal surface of the third metacarpal or metatarsal bones and are rigidly fixed to the proximo-palmar / -plantar edge of the proximal phalanx.

The MCPJ is a condyloid joint, allowing flexion and extension, but minimal rotation.

References

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Dyce KM, Sack WO, Wensing CJG. Textbook of Veterinary Anatomy (2nd Ed.) W.B. Saunders, 1996, p591

See also

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• Equine forelimb anatomy