The purpose of this study was to determine the relationship between rotator cuff (RC) tear and the orientation of the glenoid. Ninety-six shoulders (94 patients) that underwent open R C repair were grouped according to the type of tear. We measured on MRI the acromio-glenoid angle (AG) and the supraspinatus fossa glenoid angle on the anterior-posterior (SGAP) and axial (SGAX) views. R C patients had a smaller AG angle (76 +_ 7" vs. 86 f 10') and a larger SGAP angle (1 12 2 6" vs. 102 f 7") compared to controls ( p < 0.001). We also found a highly significant difference (p < 0.001) in glenoid version measured by SGAX between anterior cuff tears (-5 t 4") and posterior cuff tears (3 f 3"). Furthermore, we identified an association between R C tear and the orientation of the glenoid relative to the axis of the supraspinatus fossa. Greater retroversion is predictive of an anterior cuff injury and greater anteversion is predictive of a posterior cuff injury.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.