Anatomical study for elucidating the stabilization mechanism in the trapeziometacarpal joint

To determine the pathogenesis of trapeziometacarpal (TMC) joint instability, which leads to osteoarthritis, we investigated the anatomical relationships among the surrounding ligaments, muscles (first dorsal interosseous [FDI] and opponens pollicis [OPP]), and joint capsule. We examined the bone mor...

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Bibliographic Details
Published in:Scientific reports 2022-12, Vol.12 (1), p.20790-20790, Article 20790
Main Authors: Norose, Mio, Nimura, Akimoto, Tsutsumi, Masahiro, Fujita, Koji, Okawa, Atsushi, Akita, Keiichi
Format: Article
Language:English
Subjects:
692/698/1671/1600
692/698/1671/1668
692/698/1671/1835
Anatomy
Arthritis
Bones
Cadavers
Computed tomography
Cortical bone
Humanities and Social Sciences
Humans
Ligaments
Morphology
multidisciplinary
Muscles
Osteoarthritis
Osteoarthritis - diagnostic imaging
Osteopetrosis
Pathogenesis
Science
Science (multidisciplinary)
Thumb
Tomography
Trapezium Bone - diagnostic imaging
X-Ray Microtomography
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Summary:To determine the pathogenesis of trapeziometacarpal (TMC) joint instability, which leads to osteoarthritis, we investigated the anatomical relationships among the surrounding ligaments, muscles (first dorsal interosseous [FDI] and opponens pollicis [OPP]), and joint capsule. We examined the bone morphology and cortical bone thickening in 25 cadaveric thumbs using micro-computed tomography and performed macroscopic and histological analyses. The dorsal trapezium had a tubercle with cortical bone thickening, corresponding to the attachment of the FDI aponeurosis intermingled with the joint capsule. Radially, the thin joint capsule was observed to underlie the muscular part of the OPP. Therefore, the dorsal ligaments, which have been previously considered static stabilizers, could be interpreted as parts of the capsuloaponeurotic complex consisting of the FDI aponeurosis and joint capsule. In the radial aspect, muscular OPP activation may be essential for TMC joint stabilization. Our findings may contribute to the appropriate management of TMC osteoarthritis.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-25355-3