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Glenoid labrum: MR imaging with histologic correlation

R Loredo1, C Longo, D Salonen

  • 1Department of Radiology, University of Texas at San Antonio, USA.

Radiology
|July 1, 1995
PubMed
Summary
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Altered signal intensity in the shoulder labrum on MRI can stem from various factors like degeneration or inflammation. A specific transitional zone in the labrum correlates with increased signal intensity, aiding diagnosis.

Area of Science:

  • Orthopedic imaging
  • Histopathology
  • Shoulder anatomy

Background:

  • Magnetic resonance (MR) imaging is crucial for evaluating shoulder pathology.
  • Understanding the histopathologic basis of MR signal intensity alterations in the glenoid labrum is essential for accurate diagnosis.

Purpose of the Study:

  • To correlate specific histopathologic findings with altered intralabral and sublabral signal intensity observed on MR images.
  • To elucidate the causes of abnormal signal intensity within and below the glenoid labrum.

Main Methods:

  • Ten fresh cadaveric shoulder specimens were imaged using various MR sequences (T1-weighted, proton-density-weighted, T2-weighted spin-echo, MPGR, 3D GRE, SPGR, fat-suppressed T1-weighted).
  • Imaging was performed before and after intraarticular gadolinium injection.

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  • Specimens were subsequently frozen, sectioned, and histologically analyzed.

    • Main Results:

    • Altered intralabral signal intensity was associated with fibrovascular tissue, degenerative changes (mucoid/eosinophilic), calcification, ossification, and synovial tissue.
    • A sublabral transitional band of intermediate signal intensity corresponded to a fibrocartilaginous transitional zone.

    Conclusions:

    • Multiple histopathologic factors contribute to altered intralabral signal intensity on MR imaging.
    • A transitional fibrocartilaginous zone is linked to increased sublabral signal intensity.
    • Intraarticular gadolinium administration enhances the evaluation of the glenoid labrum.