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Posterior shoulder instability: does glenoid retroversion predict recurrence and contralateral instability?

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Glenoid retroversion is linked to posterior shoulder instability and a higher risk of contralateral shoulder injuries. Increased retroversion predicts more contralateral injuries but not recurrent instability after surgery.

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Area of Science:

  • Orthopaedic Surgery
  • Sports Medicine
  • Radiology

Background:

  • Posterior shoulder instability is a complex condition.
  • Understanding anatomical predictors is crucial for patient management.
  • Glenoid version may play a role in shoulder instability patterns.

Purpose of the Study:

  • To investigate if glenoid retroversion predicts posterior shoulder instability.
  • To assess the association between glenoid retroversion and contralateral shoulder instability.
  • To determine if glenoid retroversion predicts recurrent instability after surgery.

Main Methods:

  • Retrospective review of 143 patients undergoing shoulder stabilization.
  • Exclusion of patients with connective tissue disorders or non-traumatic pathology.
  • Measurement of glenoid version using the glenoid vault method on MRI scans.

Main Results:

  • Patients with posterior instability exhibited significantly greater glenoid retroversion compared to those with anterior instability.
  • Glenoid retroversion exceeding -16° was associated with a higher incidence of contralateral shoulder injuries.
  • No significant difference in postsurgical recurrent instability was observed based on glenoid version.

Conclusions:

  • Patients with posterior shoulder instability demonstrate a higher prevalence of retroverted glenoids.
  • Increased glenoid retroversion is associated with an increased risk of contralateral shoulder injuries.
  • Glenoid version and injury patterns can aid in counseling patients on future contralateral injury risks.