Kim YY, et al. - The association between stiff shoulder was evaluated in individuals with a full-thickness rotator cuff tear and MRI findings, especially joint capsule abnormality. A sum of 106 individuals with small to large (≤ 5 cm) full-thickness rotator cuff tears were recruited. Two radiologists examined joint capsule edema and thickness in the axillary recess, obliteration of the subcoracoid fat triangle, fatty degeneration of the torn rotator cuff muscle, and degree of retraction. The MRI findings and operative report ascertained the size and location of tears. The simple and multiple linear regression analyses and proportional odds logistic regression analysis were performed to evaluate the relationships between MRI findings and preoperative passive range of motion (ROM). In patients with a rotator cuff tear, MRI findings—particularly joint capsule edema and thickness at the axillary recess—can be beneficial in predicting shoulder stiffness.