Due to a recent fall I fractured the Humerus bone in my left shoulder and had to have surgery which resulted in having titanium screws and a plate there to hold it together and am currently in physical therapy. Does anyone know if 100% range of motion can be accomplished eventually? Thanks

What do your doctor and PT say? It depends on your age, extent of injury, original flexibility, how you are handling and adhering to PT instructions/manipulation/exercises, how well you follow up on your own. Or get an opinion from a well-respected chiropractor.

PT says doing very well. Doc says "will take very long time and some people don't get 100% back".

PT says doing very well. Doc says "will take very long time and some people don't get 100% back".
Do the assigned exercises, and do your best not to be one of those who don't get 100% back.

A nurse friend of mine had the same thing a year ago. She was out of work for 6 months and has now, a year later, regained 100% range of motion. With that said, each person is different and you may never be 100% whole. Or you may regain ROM faster. There is no way we can tell you how well you will recover. That is strictly up to your doctor and your PT.

Time will tell. I know that is kind of a crappy answer but it is the best you will get. The problem is that he doesn't know. Everything could look good now and he could expect full range of motion at this point but something unforeseen could come up and reduce the range of motion of the arm. He's being truthful.