https://drmillett.com
This video by Dr. Peter Millet and fellow orthopedic surgeons contains a comprehensive rehabilitation program for patients who have irreparable rotator cuff tears.

Scientific Background:
Massive rotator cuff tears comprise up to 40% of all rotator cuff tears.
Patients with massive rotator cuff tears can respond favorably to nonsurgical treatment.
NonSurgical treatment should be attempted for six months, prior to surgery.
NonSurgical treatment should be considered as an alternative to surgery for patients with a medical surgery.