Magnetic Resonance Imaging Analysis Demonstrates Improved Reliability in Measuring Shoulder Glenoid Bone Loss Using a Two‐Thirds Glenoid Height Technique Compared to the “Best‐fit Circle”

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Abstract
Purpose: To evaluate the superior to inferior glenoid height as a reliable reference in best‐fit circle creation for glenoid anatomy. Methods: The morphology of the native glenoid was evaluated using magnetic resonance imaging (MRI) in patients without shoulder instability. Using T1 sagittal MRI images, 2 reviewers independently estimated glenoid size using the two‐thirds technique and the “best‐fit circle” technique at 2 different times. A Student t ‐test was used to determine significant difference between the two methodologies. Inter‐ and intra‐rater reliability were calculated using interclass and intraclass coefficients. Results: This study included 112 patients. Using the results of glenoid height and “best‐fit circle” diameter, the diameter of the “best‐fit circle” was found to intersect the glenoid line at 67.8% of the glenoid height on average. We found no significant difference between the 2 measures of glenoid diameter (27.6 vs 27.9, P = .456). The interclass and intraclass coefficients for the two‐third method were 0.85 and 0.88, respectively. The interclass and intraclass coefficients for the perfect circle methods were 0.84 and 0.73, respectively. Conclusions: We determined that the diameter of a circle placed on the inferior glenoid using the “best‐fit circle” technique corresponds to 67.8% of the glenoid height. Additionally, we found that constructing a perfect circle using a diameter equal to two‐thirds the height of the glenoid may improve intraclass reliability. Level of Evidence: Level IV, retrospective cohort study.

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