Anatomical variations in the tendon sheath of the first compartment |
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Authors: | Hiroyuki Motoura Kazunari Shiozaki Kenzo Kawasaki |
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Institution: | (1) Department of Anatomy I, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama Kanagawa, 230-8501, Japan |
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Abstract: | Using Hiranuma’s classification, we carefully examined anatomical variations in the first compartments of 246 human wrist
joints from 124 cadavers. Morphological examinations were conducted to determine the number of accessory tendons and the existence
of dissepiments for the extensor pollicis brevis (EPB) and abductor pollicis longus (APL) tendons. Anatomical variations of
EPBs and APLs were grouped together by type, and appearance ratios were calculated based on Hiranuma’s classification. Of
the 246 wrist joints, 156 were categorized as normal type (63.4%), 57 as complete dissepiment type (23.2%), 22 as incomplete
dissepiment type (8.9%), and 11 as EPB-lacking type (4.5%). Accessory tendons were identified in both the EPB and the APL
tendons of most cadavers, and the incidence of dissepiment in tendon sheaths was approximately 33%. Sixty-six of the 193 wrist
joints (34.2%) showed equal numbers of right and left accessory tendons. However, the number of EPB accessory tendons was
higher than in previous studies, and in all cases some kind of dissepiment was observed in the APL and EPB. The number of
EPB and APL accessory tendons showed no clear differences by gender, age, or right and left specificity. |
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