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Subluxation in the Arthritic Shoulder.

Frederick A Matsen1, Jason E Hsu

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Arthritic glenohumeral subluxation, a partial joint separation in the shoulder, is measured by imaging. Its degree is not closely related to glenoid retroversion, impacting shoulder reconstruction outcomes.

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • Arthritic glenohumeral subluxation involves displacement of the humeral head on the glenoid surface.
  • Understanding subluxation is crucial for shoulder reconstruction outcomes.

Purpose of the Study:

  • To define and measure arthritic glenohumeral subluxation.
  • To investigate the relationship between subluxation and glenoid retroversion.
  • To clarify the clinical significance of subluxation in shoulder arthroplasty.

Main Methods:

  • Measurement of arthritic glenohumeral subluxation using radiography (axillary views) and computed tomography (CT).
  • Comparison of subluxation measurements based on imaging modality and arm position.
  • Correlation analysis between subluxation degree and glenoid retroversion.

Main Results:

  • Arthritic glenohumeral subluxation can be quantified via radiography and CT.
  • Posterior subluxation may appear greater on elevated-arm radiographs compared to side-arm CT scans for specific glenoid types (B1/B2).
  • The degree of subluxation shows a weak correlation with glenoid retroversion.

Conclusions:

  • Arthritic glenohumeral subluxation measurement techniques are established.
  • Imaging modality and arm position can influence subluxation measurements.
  • Glenoid retroversion is not a reliable indicator of glenohumeral subluxation, necessitating further research into subluxation's role in shoulder reconstruction outcomes.