The main function of the suspensory ligament is to

• A. Extend the fetlock
• B. Allow hyperextension of the knee
• C. Provide blood supply to the tendons
• D. Support and prevent hyperflexion of the limb

Answer: (D)

The suspensory ligament’s job is to stabilize the fetlock joint during weight bearing by resisting the tendency of the joint to overextend. As the horse bears weight and the fetlock tends to drop, the suspensory ligament tightens and acts like a spring, helping to support the limb and keep the joint from bending beyond its normal range. This stabilizing action is why the option describing support of the limb and preventing excessive bending fits best; it captures the idea of preventing abnormal movement under load. The other choices aren’t correct because the ligament isn’t mainly about extending the fetlock, providing blood supply to tendons, or enabling knee hyperextension.