Hi
I hope I am on the right track here, I am new at this and it seems very complex.
As for your question... My husband can not lift his left arm above his waist, he can not push or pull and he can not lift anything with this arm. He can bend at the elbow and use his hand but no weight ...
It is in my humble (30 years as an RN) opinion, my husband did some kind of injury to his left shoulder once night when he went to turn over to the left side, he hopped out of be literally screaming ! Next day, I said, see your physician... but, no... then we golfed for a few weeks, twice he winced when his club hit the ground, I said... meanwhile he finally caved in after a major miss-hit golf shot and was in bad pain.
He then saw his physician, who left on vacation that day and nothing was done while he was gone... yes, he had a replacement but he did nothing more than change the pain medication. Incidentally, my husband has a very slight frame for a male, and he now weighs 210 lbs, which in my opionion puts a lot of strain on his shoulder joint when he rolls over in a dead sleep???