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Spontaneous Extensor Pollicis Longus Rupture Associated With an Extensor Digitorum Brevis Manus
Andrew Z Coskey1, Grant R McChesney1, John J Faillace1
1Department of Orthopaedic Surgery and Rehabilitation, The University of Texas Medical Branch, Galveston, TX.
Journal of Hand Surgery Global Online
|January 27, 2023
Summary
A rare case of thumb extensor pollicis longus rupture was caused by an unusual anatomical variant. This finding necessitates altered surgical approaches due to the absence of the extensor indicis proprius tendon.
Area of Science:
- Hand surgery
- Anatomy
- Orthopedics
Background:
- Spontaneous extensor pollicis longus rupture is rare.
- Anatomical variations can predispose tendons to injury.
- Extensor digitorum brevis manus is a rare muscle variant.
Observation:
- A 64-year-old man presented with sudden loss of thumb extension.
- Intraoperative findings revealed an anomalous extensor indicis proprius fused with extensor digitorum brevis manus.
- The extensor indicis proprius tendon was absent.
Findings:
- This case presents a unique etiology for extensor pollicis longus rupture.
- The extensor digitorum brevis manus muscle belly was implicated in the rupture.
- No prior reports link this variant to extensor pollicis longus rupture.
Implications:
- Highlights a novel cause of extensor pollicis longus rupture.
- Demonstrates the importance of intraoperative anatomical assessment.
- Underscores the need for modified surgical planning when the extensor indicis proprius tendon is absent.
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