In Vivo 3-Dimensional Glenohumeral Joint Geometry Based Upon Magnetic Resonance Imaging and Computed Tomography Analysis Shows Deeper, Thicker, and Taller Glenoid Labrum Morphology at 12 O'Clock Position in Healthy Young Adults

The authors aimed to investigate the morphology of the glenoid labrum in healthy young adults, focusing on location- and sex-specific differences and their effects on the glenohumeral joint's depth and radius of curvature. Their findings revealed that the labrum at the 12 o'clock position is significantly deeper, thicker, and taller than at other locations, contributing substantially to glenoid depth and joint congruence, with no notable differences between sexes. This enhanced understanding of labrum morphology may inform surgical practices and the design of shoulder replacements.