Collagenous microstructure of the glenoid labrum and biceps anchor.
File(s)
Submitted version
Author(s)
Type
Journal Article
Abstract
The glenoid labrum is a significant passive stabilizer of the shoulder joint. However, its microstructural form remains largely unappreciated, particularly in the context of its variety of functions. The focus of labral microscopy has often been histology and, as such, there is very little appreciation of collagen composition and arrangement of the labrum, and hence the micromechanics of the structure. On transmission electron microscopy, significant differences in diameter, area and perimeter were noted in the two gross histological groups of collagen fibril visualized; this suggests a heterogeneous collagenous composition with potentially distinct mechanical function. Scanning electron microscopy demonstrated three distinct zones of interest: a superficial mesh, a dense circumferential braided core potentially able to accommodate hoop stresses, and a loosely packed peri-core zone. Confocal microscopy revealed an articular surface fine fibrillar mesh potentially able to reduce surface friction, bundles of circumferential encapsulated fibres in the bulk of the tissue, and bone anchoring fibres at the osseous interface. Varying microstructure throughout the depth of the labrum suggests a role in accommodating different types of loading. An understanding of the labral microstructure can lead to development of hypotheses based upon an appreciation of this component of material property. This may aid an educated approach to surgical timing and repair.
Version
Submitted version
Date Issued
2008-06
Citation
J Anat, 2008, 212 (6), pp.853-862
ISSN
1469-7580
Publisher
Blackwell Publishing
Start Page
853
End Page
862
Journal / Book Title
J Anat
Volume
212
Issue
6
Copyright Statement
© 2008 The Authors. Journal compilation © 2008 Anatomical Society of Great Britain and Ireland. The definitive version is available at wileyonlinelibrary.com
Identifier
PII: JOA904
Source Volume Number
212
Subjects
Aged
Aged, 80 and over
Cartilage, Articular
Collagen
Dissection
Freeze Fracturing
Humans
Joint Capsule
Microscopy, Confocal
Microscopy, Electron, Scanning
Microscopy, Electron, Transmission
Middle Aged
Shoulder Joint
Coverage Spatial
England