I had full shoulder replacement with a metal ball . It’s called a Ream and Run. You have to work hard to rehabilitate it, and some of its painful. Google “Dr. Frederick Masten, UW” . Prior to the surgery my left arm was really useless. The cartilage was all gone. I rode my bike mostly with my right arm . When I pulled up to the drive through I had to unlatch my seatbelt and use my right arm.
Two years later. I barely notice it .A couple of times I broke a fall with both arms. The coolest thing was when I was painting my house, I had to stretch my left arm like a gymnast to reach a funny spot and swivel it to handle the brush.
Boy what a miracle. A plastic shoulder would not have been very useful.