The most common causes of pain after rotator cuff surgery are (1) that the shoulder is still recovering from the surgery itself and (2) the shoulder has gotten stiff due to lack of movement.
Rotator cuff repair Information
Rotator Cuff Repair Surgery
Evaluation and Management of Failed Rotator Cuff Surgery
View from a lateral portal looking inside the right shoulder. Anterior
Shoulder:Rotator Cuff Pathology/Thickness Rotator Cuff Tears/Posterosuperior Rotator Cuff Tears and Associated Pathologies - WikiBeemed
Management of failed rotator cuff repair: a systematic review - ScienceDirect
IJERPH, Free Full-Text
Imaging of Failed Rotator Cuff Tears
Revision Repair for the Failed Rotator Cuff
Patch-Augmented Rotator Cuff Repair and Superior Capsule Reconstruction