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Related Experiment Videos

MR imaging of the labral-capsular complex: normal variations.

C H Neumann1, S A Petersen, A H Jahnke

  • 1San Francisco Magnetic Resonance Center, CA 94118.

AJR. American Journal of Roentgenology
|November 1, 1991
PubMed
Summary

The labral-capsular complex in asymptomatic shoulders shows significant variation in magnetic resonance imaging (MRI) appearance. Understanding these normal variations is crucial for accurate diagnosis of shoulder pathologies.

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Area of Science:

  • Orthopedics
  • Radiology
  • Anatomy

Background:

  • Accurate interpretation of shoulder magnetic resonance imaging (MRI) relies on understanding normal anatomy and its variations.
  • The labral-capsular complex is a key structure for shoulder stability and is frequently evaluated using MRI.

Purpose of the Study:

  • To characterize the spectrum of normal variations in the labral-capsular complex on MRI.
  • To establish a reference for interpreting MRI scans in both asymptomatic and symptomatic individuals.

Main Methods:

  • MRI scans of 52 asymptomatic shoulders and 27 symptomatic shoulders were analyzed.
  • Radiologists assessed labral shapes and capsular insertions by consensus in asymptomatic cases.
  • Symptomatic cases were interpreted before and after the asymptomatic review, with arthroscopy/surgery as the gold standard.

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Main Results:

  • Significant variability was observed in labral shapes (e.g., triangular, round, cleaved, notched, flat, absent) and capsular insertion sites (anteriorly on labrum/glenoid rim, posteriorly on labrum).
  • Intrinsic labral signal was visible on proton density-weighted images but not on T2-weighted images.
  • Radiological interpretation accuracy improved after reviewing asymptomatic variations.

Conclusions:

  • There is a wide range of normal appearances for the labral-capsular complex on shoulder MRI.
  • Familiarity with these variations enhances diagnostic confidence and accuracy in evaluating shoulder pathology.