Validating the Glenoid Track Concept Using Dynamic Arthroscopic Assessment.

Area of Science:

• Orthopedic surgery
• Sports medicine
• Shoulder instability research

Background:

• Recurrent shoulder instability after Bankart repair prompts evaluation of Hill-Sachs lesions.
• The glenoid track concept aids in classifying Hill-Sachs lesions as 'on-track' or 'off-track' to guide treatment.
• Validation of the glenoid track concept's accuracy and reliability is crucial for surgical decision-making.

Purpose of the Study:

• To assess the accuracy and reliability of the glenoid track concept.
• To compare diagnostic methods for Hill-Sachs lesion engagement.
• To validate the glenoid track concept against dynamic arthroscopic assessment.

Main Methods:

• A cohort of 49 patients with recurrent traumatic anterior shoulder instability undergoing Bankart repair was studied.
• Shoulder stability was assessed using 3D computed tomography (3DCT) and static arthroscopic measurements.
• Classifications were validated against dynamic arthroscopic assessment in an 'athletic position' to evaluate Hill-Sachs lesion engagement.

Main Results:

• 3DCT showed higher positive predictive value (66%) and accuracy (65%) than static arthroscopy (42%, 59%).
• Static arthroscopy demonstrated higher negative predictive value (96%) and sensitivity (96%) compared to 3DCT (64%, 81%).
• Interrater reliability was 'fair' for 3DCT (α=0.368) and 'moderate' for static arthroscopy (α=0.523); intrarater reliability was 'moderate' for 3DCT (ICC=0.660) and 'good' for static arthroscopy (ICC=0.769).

Conclusions:

• Both 3DCT and static arthroscopic measurements for glenoid track status provide moderate accuracy and reliability.
• Surgeons should exercise caution when using the glenoid track concept with either 3DCT or static arthroscopic measurements for surgical decisions.
• Further research may be needed to refine the glenoid track concept's application in managing shoulder instability.