Every single ligament is torn in both Shoulders rotator cuffs on me, massive tears, I have FS too.
I can't lift my arms out to my sides or front more than 30 degrees & can't lift my arms up overhead or any Incline work.
I can't even bench press an Olympic bar for a full rep.
What I can do is use machines because they stabilise the rotator cuff.
I do,
Overhead presses on a machine 4.5kgs total both arms thats all I can do. It feels like 100kgs, it all goes onto the muscle as there is no joint stability.
Dumbell side laterals 30 degrees out to the side
Machine side raises 30 degrees
Reverse pec deck
Dumbell rear laterals
Face pull
The amount of weight you can use is irrelevant as long as you can work the target muscle to the point of failure that's all that matters brother
You would be surprised what my current physique looks like using less than girls weights. Like I said muscle failure on the last set of an exercise thats all that matters.
The amount of weight used doesn't matter.