What is the principal function of the suspensory ligament in the horse?

What is the principal function of the suspensory ligament in the horse?

• A. To support, suspend and prevent hyperextension of the metacarpophalangeal (fetlock) joint
• B. To flex the fetlock during movement
• C. To stabilize the carpal joints
• D. To limit extension of the stifle

Answer: (A)

The suspensory ligament mainly serves to support and suspend the fetlock joint, preventing hyperextension during weight-bearing. It runs along the palmar/plantar aspect of the metacarpus, attaching to the proximal sesamoid bones, so as the horse bears weight it becomes taut and resists the fetlock dropping too far downward. This setup helps stabilize the joint and stores elastic energy to aid propulsion through the stride. Flexion of the fetlock is achieved by the flexor muscles and tendons, not by this ligament. It also isn’t the primary structure for stabilizing the carpal joints or limiting extension of the stifle, which involve other ligaments and joint mechanisms.

The suspensory ligament mainly serves to support and suspend the fetlock joint, preventing hyperextension during weight-bearing. It runs along the palmar/plantar aspect of the metacarpus, attaching to the proximal sesamoid bones, so as the horse bears weight it becomes taut and resists the fetlock dropping too far downward. This setup helps stabilize the joint and stores elastic energy to aid propulsion through the stride. Flexion of the fetlock is achieved by the flexor muscles and tendons, not by this ligament. It also isn’t the primary structure for stabilizing the carpal joints or limiting extension of the stifle, which involve other ligaments and joint mechanisms.