Deltoid Muscle Volume After Superior Capsule Reconstruction in Patients With Irreparable Rotator Cuff Tears: A 3-Dimensional Magnetic Resonance Imaging Analysis

The change in deltoid muscle volume was significantly positively correlated with the changes in active elevation, ASES score, and JOA score after SCR. This suggests that deltoid muscle strengthening should be recommended to improve shoulder function after SCR. An increase in AHD, which represents the restoration of glenohumeral superior stability, after SCR may be necessary to improve deltoid function.