Which joints are protected from overextension by SDF and DDF tendons?

Which joints are protected from overextension by SDF and DDF tendons?

• A. Carpus and fetlock joint
• B. Stifle
• C. Hock
• D. Interphalangeal joints

Answer: (A)

The idea being tested is how passive structures in the stay apparatus keep joints from moving beyond their safe range when the limb bears weight. The superficial and deep digital flexor tendons cross the carpus and fetlock, and their associated check ligaments become taut as the limb bears load. This tension acts as a brake, preventing these joints from extending too far and helping to lock the limb in a stable position. In this way, the carpus and fetlock are protected from overextension by the SDF and DDF tendons working with their check ligaments. The other joints are stabilized mainly by different parts of the stay apparatus and ligaments, not by these tendons in the same way.

The idea being tested is how passive structures in the stay apparatus keep joints from moving beyond their safe range when the limb bears weight. The superficial and deep digital flexor tendons cross the carpus and fetlock, and their associated check ligaments become taut as the limb bears load. This tension acts as a brake, preventing these joints from extending too far and helping to lock the limb in a stable position. In this way, the carpus and fetlock are protected from overextension by the SDF and DDF tendons working with their check ligaments. The other joints are stabilized mainly by different parts of the stay apparatus and ligaments, not by these tendons in the same way.