ANATOMY OF THE EXTENSOR POLLICIS BREVIS ASSOCIATED WITH AN EXTENSION MECHANISM OF THE THUMB METACARPOPHALANGEAL JOINT
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- Shinsuke Shigematsu
- Department of Orthopaedic Surgery, St Marianna University School of Medicine, Kawasaki, Japan
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- Hiroyuki Shimizu
- Department of Orthopaedic Surgery, St Marianna University School of Medicine, Kawasaki, Japan
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- Moroe Beppu
- Department of Orthopaedic Surgery, St Marianna University School of Medicine, Kawasaki, Japan
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- Kazuaki Hirata
- Department of Anatomy, St Marianna University School of Medicine, Kawasaki, Japan
説明
<jats:p> This study aimed to determine whether the extensor pollicis longus (EPL) or abductor pollicis longus (APL) can replace the function of thumb extension in hands in which the extensor pollicis brevis (EPB) is absent. Cadaver dissection was performed to examine anatomical association between the interphalangeal (IP) joint and metacarpophalangeal (MP) joint of the thumb, as well as extension mechanism in clinical cases. </jats:p><jats:p> EPB insertion could be classified into eight types, and the EPB was absent in 7.6% of all cases. In hands without an EPB, the width of the EPL tendon tended to be wider, and the number of APL tendons was significantly greater than in hands with an EPB. </jats:p><jats:p> In hands without an EPB, the EPL and APL may replace the function of the EPB. As a result, a greater load is imposed on these two tendons than in hands with the EPB. </jats:p>
収録刊行物
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- Hand Surgery
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Hand Surgery 19 (02), 171-179, 2014-01
World Scientific Pub Co Pte Lt
