What structure links movement at the hock and stifle?

What structure links movement at the hock and stifle?

• A. Reciprocal apparatus
• B. DDF check ligaments
• C. SDF
• D. Suspensory ligament

Answer: (A)

Movement at the hock and stifle is linked by the reciprocal apparatus. This system ties the stifle and hock so they move in unison during a stride. The main players are the peroneus tertius tendon and the superficial digital flexor tendon, which cross these joints and coordinate their motion. When the stifle extends, the hock is pulled into extension; when the stifle flexes, the hock flexes as well. This coupling helps keep the limb properly aligned under load and supports smooth, efficient gait. Other structures play supporting roles but don’t coordinate the two joints in the same way. DDF check ligaments limit deep digital flexor movement to protect the limb; the superficial digital flexor tendon by itself participates in the system but isn’t the sole linkage; and the suspensory ligament mainly supports the fetlock, not the stifle–hock connection.

Movement at the hock and stifle is linked by the reciprocal apparatus. This system ties the stifle and hock so they move in unison during a stride. The main players are the peroneus tertius tendon and the superficial digital flexor tendon, which cross these joints and coordinate their motion. When the stifle extends, the hock is pulled into extension; when the stifle flexes, the hock flexes as well. This coupling helps keep the limb properly aligned under load and supports smooth, efficient gait.

Other structures play supporting roles but don’t coordinate the two joints in the same way. DDF check ligaments limit deep digital flexor movement to protect the limb; the superficial digital flexor tendon by itself participates in the system but isn’t the sole linkage; and the suspensory ligament mainly supports the fetlock, not the stifle–hock connection.