De Quervain's tenosynovitis involves inflammation of which tendons?

De Quervain's tenosynovitis involves inflammation of which tendons?

• A. Abductor pollicis longus and extensor pollicis brevis tendons.
• B. Flexor pollicis longus tendon.
• C. Extensor carpi ulnaris tendon.
• D. Brachioradialis.

Answer: (A)

This item tests which tendons are affected in De Quervain's tenosynovitis. The condition is stenosing tenosynovitis of the first dorsal wrist compartment, where the abductor pollicis longus and extensor pollicis brevis tendons glide under the extensor retinaculum near the base of the thumb. Inflammation of these tendon sheaths causes pain and tenderness on the radial side of the wrist, especially with thumb abduction and extension or during grasping. The other tendons listed aren’t located in that compartment: the flexor pollicis longus is a deep palmar tendon, while extensor carpi ulnaris is on the ulnar side, and brachioradialis runs along the forearm. So, the tendons involved are the abductor pollicis longus and extensor pollicis brevis.

This item tests which tendons are affected in De Quervain's tenosynovitis. The condition is stenosing tenosynovitis of the first dorsal wrist compartment, where the abductor pollicis longus and extensor pollicis brevis tendons glide under the extensor retinaculum near the base of the thumb. Inflammation of these tendon sheaths causes pain and tenderness on the radial side of the wrist, especially with thumb abduction and extension or during grasping. The other tendons listed aren’t located in that compartment: the flexor pollicis longus is a deep palmar tendon, while extensor carpi ulnaris is on the ulnar side, and brachioradialis runs along the forearm. So, the tendons involved are the abductor pollicis longus and extensor pollicis brevis.