Effect of a Posterior Shoulder Pillow on Pain and Sleep Quality After Rotator Cuff Repair

Inclusion Criteria: * Diagnosis of a rotator cuff tear, confirmed by imaging (MRI or ultrasound), and deemed suitable for either single-row or double-row arthroscopic repair surgery. * Age between 40 and 70 years. * Willing and able to provide written informed consent to participate in the study. * Demonstrates good compliance with postoperative rehabilitation and follow-up requirements. Exclusion Criteria: * Presence of concomitant shoulder pathologies, such as glenohumeral osteoarthritis, adhesive capsulitis, history of labral repair, or irreparable tendon tears. * Pre-existing severe shoulder infection, tumor, or other conditions that may significantly impact postoperative recovery. * Previous history of shoulder surgery or severe shoulder deformity that could confound the assessment of postoperative outcomes. * Cognitive impairment or inability to understand the pain assessment tools (e.g., VAS score). * Significant comorbidities affecting the heart, liver, or kidneys, or requiring long-term use of medications that affect coagulation (e.g., aspirin). * Diagnosis of malignant tumors or rheumatic autoimmune diseases that may interfere with postoperative recovery. * MRI findings indicating significant fatty infiltration (\>50%) or tendon retraction, suggesting potential compromise in surgical outcome and recovery. * Superior migration of the humeral head or obliteration of the coracoacromial space, indicating a high difficulty of rotator cuff repair. * Contraindications t…