In the yearling, the flexural deformity involves which joint?

In the yearling, the flexural deformity involves which joint?

• A. Carpal joint
• B. Metacarpophalangeal joint
• C. Fetlock joint
• D. Pastern joint

Answer: (B)

Flexural deformities in young horses usually stem from tight flexor tendons pulling on a joint as the limb grows. In yearlings, the problem most often presents at the fetlock, the metacarpophalangeal joint, because contraction of the superficial (and sometimes deep) digital flexor tendons shortens the limb at that joint, causing the fetlock to sit in increased flexion under weight. The fetlock is the joint between the cannon bone and the proximal phalanx, so tendon tightness directly affects its extension. While other joints like the pastern or coffin can be involved in more severe or different forms, the typical flexural deformity in a yearling centers on the fetlock.

Flexural deformities in young horses usually stem from tight flexor tendons pulling on a joint as the limb grows. In yearlings, the problem most often presents at the fetlock, the metacarpophalangeal joint, because contraction of the superficial (and sometimes deep) digital flexor tendons shortens the limb at that joint, causing the fetlock to sit in increased flexion under weight. The fetlock is the joint between the cannon bone and the proximal phalanx, so tendon tightness directly affects its extension. While other joints like the pastern or coffin can be involved in more severe or different forms, the typical flexural deformity in a yearling centers on the fetlock.