Concerns after Reverse Total Shoulder Replacement

Hello,
Yes, I can move my arm easily if assisted (passive motion). Nothing keeping it from externally rotating if I push on it, but Active (unassisted) motion stops at the same place.
If I assist my surgery arm, so that forearm is perpendicular to the floor, and then let go, it pops right back to the same spot. As hard as I try, all my might, there is just nothing there. I would think there would be some progress, some ability if it were going to get better.
all other movements of my arm are rather good already. ...elevating my arm forwards, sideways, internal rotation.
It's uncomfortable constantly fighting the elbow moving outward when I'm trying to reach for something. Deltoid is sore.

I'm trying to think of what muscle group would be used in rotating your arm up. Maybe the deltoid? Don't know for sure.

It just seems like a muscle issue. You have no strength to rotate that forearm up, but you can easily push it up with your other arm.

Finally, did your Dr. tell you a RSR was possible? That seems like a big decision to make if you didn't know it could be coming.

I have arthritis in both shoulders, one of them produces pain and cortisone shots help a lot. I may get it replaced in the future, and as my rotator cuff is intact, I expect that would be an anatomically-correct TSR, not an RSR. I'm not sure I'd have an RSR, but I certainly would like to know if that might be necessary.

Again, this looks like total loss of the muscle responsible for rotating your arm up.

I'm sorry for what you're going through and hope you can get some answers. All the best to you young man.

Yes it is the deltoids that help to raise your arm,especially if rotator cuff is not good. I am 12 months postoperative after trust and still cannot touch the middle of the back of my head and am not driving. My surgery was done because of fractures and surgeon said outcome is not always as good as it would be for arthritis. I had a nerve test done to make sure that was not the issue,but it was not. I will keep exercising and now am doing light weights ,for deltoids,which was not suggested at the 2 pt places I went to.
I am hoping Fredhas made more progress and never give up .

I am really sorry to read this, you are too young to have had this kind of bad result. From the picture, it looks like your arm is almost frozen in a sling position? Do I have that right? Were you referred to Physical Therapy after the surgery, and if so have you discussed with your PT person what might be causing this lack of motion? If they are properly licensed, they should have as much knowledge about the workings of bones and muscles as doctors.
I had a reverse TSR at about 74, and my new shoulder was working perfectly by about four months. My TSR has the same range of motion now as my non-surgical arm in every direction. My only limitation is trying to reach behind my back from butt level on up, I can only reach about to my waist, no further up. Over the shoulder and back, same on both sides. From what I understand, only the frontal part of my rotator cuff was removed, and you can see the slight depression there, compared to my normal shoulder.
Prior to surgery, I had x-rays to determine the condition of the bone and cartilage, those verified I was a candidate for a TSR. Next I had an MRI and a CT scan both in one appointment to determine the condition and health of surrounding tissues. After viewing these results, my surgeon said my rotator cuff was somewhat frayed and right on the borderline for a regular TSR and he could not guarantee good long term results. He gave me the choice, and I opted for a reverse, because I did not want to go through a possible 2nd surgery in a few years. I then went back for one more special MRI which was to take measurements for a custom made prosthesis for me from the manufacturing company.
Surgery went fine, very little pain afterwards. I wore an immobilizer instead of a traditional shoulder sling during recovery, which let me unhook the wrist band from the waist velcro at times and use the lower arm freely while keeping the elbow locked to the waist. I was able to use a keyboard on a desk right after getting home from the overnight hospital stay. I have not had the outward swing problem you describe.
It does seem very odd that you would be changed from a traditional to a reverse TSR during the surgery, and I think you deserve a more detailed explanation why he chose to do that. The ball and the socket are replaced in both surgeries, so just saying the socket was worn down makes no sense. I would also try to work closely with a good PT specialist to determine why the lack of range and what can be done about it. So sorry for your bad experience.