Histology of the volar plate of the thumb metacarpophalangeal joint.
Articulation metacarpo-phalangienne
Histologie
Histology
Metacarpophalangeal joint
Plaque palmaire
Pouce
Thumb
Volar plate
Journal
Hand surgery & rehabilitation
ISSN: 2468-1210
Titre abrégé: Hand Surg Rehabil
Pays: France
ID NLM: 101681801
Informations de publication
Date de publication:
04 2023
04 2023
Historique:
received:
25
11
2022
revised:
10
02
2023
accepted:
11
02
2023
medline:
28
3
2023
pubmed:
23
2
2023
entrez:
22
2
2023
Statut:
ppublish
Résumé
The aim of the study was to describe the histology of the thumb MCPJ volar plate. Five fresh-frozen thumbs were dissected. The volar plates were harvested from the thumb MCPJ. Histological analyses were performed using 0.04% Toluidine blue and counterstained with 0.005% Fast green. The thumb MCPJ volar plate comprised two sesamoids, dense fibrous tissue and loose connective tissue. The two sesamoids were connected by dense fibrous tissue, with collagen fibers oriented transversely (perpendicular to the long axis of the thumb). In contrast, the collagen fibers within the dense fibrous tissue on the lateral sides of the sesamoid were oriented longitudinally in line with long axis of the thumb. These fibers blended with the fibers of the radial and ulnar collateral ligaments. The collagen fibers in the dense fibrous tissue distal to the sesamoids ran transversely, perpendicular to the long axis of the thumb. The proximal aspect of the volar plate showed only loose connective tissue. The volar plate of the thumb MCPJ was largely uniform with no division of layers from the dorsum to the palmar surface. There was no fibrocartilaginous component in the thumb MCPJ volar plate. The histology of the volar plate of the thumb MCPJ differs significantly from the conventional understanding of the volar plate, based on the volar plate of finger proximal interphalangeal joints. The difference is likely due to the presence of the sesamoids, which confer additional stability, reducing the need for a specialized trilaminar fibrocartilaginous structure with the lateral check-rein ligaments found in the volar plate of finger proximal interphalangeal joints to confer additional stability.
Sections du résumé
BACKGROUND
The aim of the study was to describe the histology of the thumb MCPJ volar plate.
METHODS
Five fresh-frozen thumbs were dissected. The volar plates were harvested from the thumb MCPJ. Histological analyses were performed using 0.04% Toluidine blue and counterstained with 0.005% Fast green.
RESULTS
The thumb MCPJ volar plate comprised two sesamoids, dense fibrous tissue and loose connective tissue. The two sesamoids were connected by dense fibrous tissue, with collagen fibers oriented transversely (perpendicular to the long axis of the thumb). In contrast, the collagen fibers within the dense fibrous tissue on the lateral sides of the sesamoid were oriented longitudinally in line with long axis of the thumb. These fibers blended with the fibers of the radial and ulnar collateral ligaments. The collagen fibers in the dense fibrous tissue distal to the sesamoids ran transversely, perpendicular to the long axis of the thumb. The proximal aspect of the volar plate showed only loose connective tissue. The volar plate of the thumb MCPJ was largely uniform with no division of layers from the dorsum to the palmar surface. There was no fibrocartilaginous component in the thumb MCPJ volar plate.
CONCLUSIONS
The histology of the volar plate of the thumb MCPJ differs significantly from the conventional understanding of the volar plate, based on the volar plate of finger proximal interphalangeal joints. The difference is likely due to the presence of the sesamoids, which confer additional stability, reducing the need for a specialized trilaminar fibrocartilaginous structure with the lateral check-rein ligaments found in the volar plate of finger proximal interphalangeal joints to confer additional stability.
Identifiants
pubmed: 36813164
pii: S2468-1229(23)00037-3
doi: 10.1016/j.hansur.2023.02.004
pii:
doi:
Substances chimiques
Collagen
9007-34-5
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
141-146Informations de copyright
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