Question:
The tendons affected in De Quervain tenosynovitis are those of:
The tendons affected in De Quervain tenosynovitis are those of:
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First dorsal compartment of the wrist = APL + EPB.
Updated On: Jun 24, 2026
- Abductor pollicis longus and extensor pollicis brevis
- Adductor pollicis longus and extensor pollicis brevis
- Abductor pollicis longus and flexor pollicis brevis
- Adductor pollicis longus and flexor pollicis brevis
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The Correct Option is A
Solution and Explanation
Step 1: De Quervain tenosynovitis is a stenosing tenosynovitis of the first dorsal compartment of the wrist, the fibro-osseous tunnel on the radial side of the wrist over the radial styloid.
Step 2: The first dorsal compartment transmits two tendons: the abductor pollicis longus and the extensor pollicis brevis. Thickening of the sheath around these two tendons causes pain on thumb movement and a positive Finkelstein test. So the correct pair is abductor pollicis longus and extensor pollicis brevis.
Step 3: Why the others are wrong. There is no muscle called adductor pollicis longus, so options containing it are anatomically invalid. The flexor pollicis brevis lies in the palm and is not part of the first dorsal compartment, so it is not involved.
Step 2: The first dorsal compartment transmits two tendons: the abductor pollicis longus and the extensor pollicis brevis. Thickening of the sheath around these two tendons causes pain on thumb movement and a positive Finkelstein test. So the correct pair is abductor pollicis longus and extensor pollicis brevis.
Step 3: Why the others are wrong. There is no muscle called adductor pollicis longus, so options containing it are anatomically invalid. The flexor pollicis brevis lies in the palm and is not part of the first dorsal compartment, so it is not involved.
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