Definition.
The fetlock joint is a synovial condylar joint located between the distal metacarpus or metatarsus and the proximal phalanx of the horse.
It is commonly referred to as the metacarpophalangeal joint in the forelimb and the metatarsophalangeal joint in the hindlimb.
The fetlock is a highly mobile and mechanically important joint that plays a major role in locomotion by allowing controlled flexion and extension, while also absorbing and storing mechanical energy during movement.
Because the joint is subjected to substantial forces, particularly during high-speed exercise, an understanding of its anatomy and biomechanics is important for veterinary professionals and farriers.
Anatomy.
The primary bony structures of the fetlock are the distal end of the third metacarpal or metatarsal bone, the proximal phalanx, and the paired proximal sesamoid bones.
The distal metacarpal or metatarsal bone has medial and lateral condyles that articulate with the proximal phalanx.
The proximal sesamoid bones are positioned palmar or plantar to the joint and form an important part of the suspensory apparatus.
The joint is enclosed within a fibrous joint capsule with a synovial membrane producing synovial fluid to lubricate and nourish the articular surfaces.
The arrangement of the joint surfaces permits predominantly flexion and extension, although small degrees of lateral movement are possible.
The fetlock therefore provides both mobility and stability, which are essential requirements for efficient locomotion.
Definition.
The fetlock joint is a synovial condylar joint located between the distal metacarpus or metatarsus and the proximal phalanx of the horse.
It is commonly referred to as the metacarpophalangeal joint in the forelimb and the metatarsophalangeal joint in the hindlimb.
The fetlock is a highly mobile and mechanically important joint that plays a major role in locomotion by allowing controlled flexion and extension, while also absorbing and storing mechanical energy during movement.
Because the joint is subjected to substantial forces, particularly during high-speed exercise, an understanding of its anatomy and biomechanics is important for veterinary professionals and farriers.
Anatomy.
The primary bony structures of the fetlock are the distal end of the third metacarpal or metatarsal bone, the proximal phalanx, and the paired proximal sesamoid bones.
The distal metacarpal or metatarsal bone has medial and lateral condyles that articulate with the proximal phalanx.
The proximal sesamoid bones are positioned palmar or plantar to the joint and form an important part of the suspensory apparatus.
The joint is enclosed within a fibrous joint capsule with a synovial membrane producing synovial fluid to lubricate and nourish the articular surfaces.
The arrangement of the joint surfaces permits predominantly flexion and extension, although small degrees of lateral movement are possible.
The fetlock therefore provides both mobility and stability, which are essential requirements for efficient locomotion.
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