Massive rotator cuff injuries may require shoulder replacement surgery. To improve the artificial joint’s stability, an innovative procedure (reverse shoulder arthroplasty) installs the ball part of the artificial joint onto the shoulder blade and the socket part onto the arm bone. Video: Tendon transfer to repair rotator cuff
https://www.mayoclinic.org/diseases-conditions/rotator-cuff-injury/diagnosis-treatment/drc-20350231

