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Posterior Shoulder Instability: What to Look for.

Domenico Albano1, Carmelo Messina2, Luca Maria Sconfienza2

  • 1IRCCS Istituto Ortopedico Galeazzi, Via Riccardo Galeazzi 4, Milano 20161, Italy; Sezione di Scienze Radiologiche, Dipartimento di Biomedicina, Neuroscienze e Diagnostica Avanzata, Università degli Studi di Palermo, Via del Vespro 127, Palermo 90127, Italy.

Magnetic Resonance Imaging Clinics of North America
|April 4, 2020
PubMed
Summary

Diagnosing posterior shoulder instability can be challenging due to subtle symptoms. Magnetic resonance (MR) imaging is crucial for identifying instability and associated abnormalities, aiding in patient management.

Keywords:
GlenoidInstabilityLabrumMR imagingMagnetic resonance arthrographyShoulder

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Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • Posterior shoulder instability is frequently underdiagnosed due to nonspecific patient complaints.
  • Clinical examination alone often fails to detect posterior shoulder instability.
  • Advanced imaging is essential for accurate diagnosis and management.

Purpose of the Study:

  • To review the magnetic resonance (MR) imaging features of posterior shoulder instability.
  • To describe the micro/macrotraumatic findings associated with this condition.
  • To identify predisposing anatomical abnormalities detectable by MR imaging.

Main Methods:

  • Review of pathological magnetic resonance (MR) imaging features.
  • Correlation of imaging findings with clinical presentation.
  • Analysis of anatomical variations contributing to instability.

Main Results:

  • MR imaging and MR arthrography are pivotal in diagnosing posterior shoulder instability.
  • Specific MR findings reveal micro/macrotraumatic changes.
  • Underlying abnormalities include glenoid, humeral, labral, and capsular/ligamentous variations.

Conclusions:

  • MR imaging is indispensable for diagnosing posterior shoulder instability.
  • Identifying predisposing anatomical factors through MR imaging improves management strategies.
  • A comprehensive understanding of MR features aids in differentiating instability from other shoulder pathologies.