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Histologic and scanning electron microscopic study of the glenoid labrum
K Nishida1, H Hashizume, K Toda
1Department of Orthopaedic Surgery, Okayama University Medical School, Japan.
Journal of Shoulder and Elbow Surgery
|March 1, 1996
Summary
The glenoid labrum has a triple-layered collagen structure that stabilizes the shoulder joint. This detailed fibrillar architecture provides cushioning and impact protection, crucial for understanding shoulder diseases.
Area of Science:
- Orthopedic Surgery
- Anatomy
- Biomechanical Engineering
Background:
- The glenoid labrum is integral to shoulder joint stability.
- Understanding its detailed structure is key to diagnosing and treating shoulder pathologies.
Purpose of the Study:
- To investigate the three-dimensional fibrillar architecture of the glenoid labrum.
- To elucidate the labrum's attachment to the glenoid rim.
- To correlate structural findings with shoulder joint biomechanics and disease.
Main Methods:
- Analysis of 15 cadaveric shoulder specimens.
- Scanning electron microscopy (SEM) for detailed ultrastructural examination.
- Histological assessment of collagenous architecture.
Main Results:
- The anatomic labrum is a variable narrow band at the glenoid rim-capsule junction.
- A distinct triple-layered collagen structure was identified.
- Superficial layers form a reticulated and stratified network, acting as impact bumpers.
- The deep layer comprises densely packed, oblique fibrils, functioning as a primary stabilizer and cushion.
Conclusions:
- The glenoid labrum's complex, layered fibrillar architecture is critical for shoulder joint stability.
- This structure provides both impact absorption and dynamic stabilization.
- Detailed knowledge of labral anatomy aids in understanding shoulder disease pathogenesis.