Which statement about collateral ligaments is true?

• A. They prevent elbow flexion
• B. They prevent carpal flexion
• C. They prevent fetlock extension
• D. They prevent stifle extension

Answer: (A)

Collateral ligaments mainly act as stabilizers for a joint, providing a check against abnormal movement and helping keep the limb aligned when it bears weight. In the forelimb, these ligaments help limit excessive bending by resisting further flexion once the joint reaches a protective angle, which is why this statement about preventing elbow flexion fits the general stabilizing role of collateral ligaments. The other joints rely more on different structures for their specific movements (carpal, fetlock, stifle), so the idea that collateral ligaments on those joints primarily prevent those movements isn’t as accurate.