Unfortunately, yes. The rotator cuff is made up of four muscles and the tendons that attach them to the shoulder joint. If the cuff is torn, early treatment and repair is best.
Untreated, a small tear can become a large tear. If the tendon is completely separated, scar tissue fills in. Again, early in the injury, repair is more likely. After a number of years, this isn’t possible.
Exercise to keep the joint stable and the remaining muscles strong is advised. Pain can be reduced and activity increased. However, the patient may always have some pain and less than normal motion.