Question:medium
The tendons affected in De Quervain tenosynovitis are those of:
The tendons affected in De Quervain tenosynovitis are those of:
Show Hint
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
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Recall the six dorsal wrist compartments. The most radial one, compartment 1, is the site of De Quervain disease, a non-inflammatory thickening of the tendon sheath that narrows the tunnel.
Step 2: Two tendons run through compartment 1: abductor pollicis longus (which abducts the thumb) and extensor pollicis brevis (which extends the thumb at the metacarpophalangeal joint). Friction of these two swollen tendons against the tight sheath produces radial wrist pain reproduced by the Finkelstein manoeuvre. The answer is therefore this pair.
Step 3: Knock out the wrong options. "Adductor pollicis longus" does not exist as a named muscle, immediately excluding two choices. Flexor pollicis brevis is a thenar muscle in the palm and never traverses the dorsal first compartment, so it cannot be involved.
\[\boxed{\text{Abductor pollicis longus and extensor pollicis brevis}}\]
Step 2: Two tendons run through compartment 1: abductor pollicis longus (which abducts the thumb) and extensor pollicis brevis (which extends the thumb at the metacarpophalangeal joint). Friction of these two swollen tendons against the tight sheath produces radial wrist pain reproduced by the Finkelstein manoeuvre. The answer is therefore this pair.
Step 3: Knock out the wrong options. "Adductor pollicis longus" does not exist as a named muscle, immediately excluding two choices. Flexor pollicis brevis is a thenar muscle in the palm and never traverses the dorsal first compartment, so it cannot be involved.
\[\boxed{\text{Abductor pollicis longus and extensor pollicis brevis}}\]
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