Question:
The patient is presenting with pain around the base of the thumb. The tendons involved are:
The patient is presenting with pain around the base of the thumb. The tendons involved are:
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Which two tendons share the first dorsal wrist compartment over the radial styloid?
Updated On: Jun 23, 2026
- APB and EBL
- APL and EPB
- APB and EPB
- APL and EPL
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The Correct Option is B
Solution and Explanation
Step 1: Pain at the radial side of the wrist at the base of the thumb describes De Quervain's tenosynovitis.
Step 2: De Quervain's is a painful inflammation of the tendons in the first dorsal compartment of the wrist. The two tendons in that compartment are the abductor pollicis longus (APL) and the extensor pollicis brevis (EPB), which run through a fibro-osseous tunnel over the radial styloid under the extensor retinaculum.
Step 3: APB (abductor pollicis brevis) is a thenar intrinsic muscle, not in the first dorsal compartment. EPL (extensor pollicis longus) lies in the third compartment and forms the ulnar border of the anatomical snuffbox. So the affected tendons are APL and EPB.
Ref: Physiopedia, De Quervain's Tenosynovitis.
Step 2: De Quervain's is a painful inflammation of the tendons in the first dorsal compartment of the wrist. The two tendons in that compartment are the abductor pollicis longus (APL) and the extensor pollicis brevis (EPB), which run through a fibro-osseous tunnel over the radial styloid under the extensor retinaculum.
Step 3: APB (abductor pollicis brevis) is a thenar intrinsic muscle, not in the first dorsal compartment. EPL (extensor pollicis longus) lies in the third compartment and forms the ulnar border of the anatomical snuffbox. So the affected tendons are APL and EPB.
Ref: Physiopedia, De Quervain's Tenosynovitis.
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