Glenoid version shoulder instability is a critical anatomical factor that orthopedic surgeons must evaluate when managing recurrent joint trauma. While researchers previously debated the role of glenoid morphology, new evidence suggests a strong correlation between anteversion and dislocation risk. Understanding these variations helps clinicians refine surgical strategies for patients with traumatic shoulder injuries.

Assessing Glenoid Version Shoulder Instability Patterns

A recent retrospective case-control study compared 214 patients with traumatic anterior shoulder instability to 104 healthy controls. The researchers used standardized axial CT imaging to measure glenoid version via the Friedman method. Specifically, three independent observers performed the measurements to ensure high interobserver reliability. The study also classified instability cases based on the presence of isolated Bankart or combined Bankart and Hill-Sachs lesions.

The results revealed significant differences between the groups. Specifically, patients with instability exhibited higher mean anteversion (5.17°) compared to the control group (1.83°). Moreover, the study found that anteversion was most pronounced in patients with combined Bankart and Hill-Sachs lesions. Consequently, these findings highlight a link between anatomical predisposition and the severity of bony and soft tissue damage.

Clinical Implications for Surgical Planning

Furthermore, the data indicates that a higher frequency of dislocation episodes correlates with increased glenoid anteversion. Because of this relationship, surgeons should prioritize preoperative CT scans to assess bony anatomy thoroughly. Notably, identifying these anatomical variations allows for better risk stratification. For instance, patients with significant anteversion may require different stabilization techniques than those with normal glenoid morphology.

Therefore, integrating CT-based measurements into routine evaluations can improve patient outcomes. Additionally, the reliability of the Friedman method makes it a practical tool for clinical use. By addressing these anatomical risk factors, surgeons can potentially reduce the high recurrence rates associated with arthroscopic stabilization in high-risk patients.

Frequently Asked Questions

How does glenoid version impact shoulder stability?

Increased glenoid anteversion reduces the bony constraint of the humeral head. This anatomical variation makes the joint more susceptible to anterior displacement and recurrent dislocations during traumatic events.

What is the Friedman method for measuring glenoid version?

The Friedman method is a CT-based technique where a line is drawn along the scapular axis and another across the glenoid margins. The angle between these lines determines the degree of anteversion or retroversion.

Is there a link between glenoid version and Hill-Sachs lesions?

Yes, research shows that patients with both Bankart and Hill-Sachs lesions often have higher degrees of glenoid anteversion compared to those with isolated soft tissue injuries.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or establish a doctor-patient relationship. Always seek the advice of a qualified healthcare provider regarding any medical condition or treatment. Refer to the latest local and national guidelines for clinical practice.

References

Altuntas Y et al. Glenoid version and recurrent anterior shoulder dislocation: a case-control study. BMC Musculoskelet Disord. 2026 Feb 09. doi: 10.1186/s12891-026-09594-3. PMID: 41664001.

Matsumura K et al. Glenoid version measurement methods on MRI: accuracy and reliability analysis. J Shoulder Elb Surg. 2014;23(9):1350-1358. doi: 10.1016/j.jse.2014.01.042.

Provencher MT et al. The radiologic evaluation and clinical significance of glenohumeral bone loss in anterior shoulder instability. PMC. 2024. Available at: nih.gov.