(POSSIBLE SPOILER FOLLOWS)

I've seen this movie at least a couple times in recent years (though not within the last five, I don't believe) and know it's a remake of 1924's The Hands of Orlac. I know what the Silent film's resolution is. But whether both movies share the identical resolution, I no longer recall. In the Silent The Hands of Orlac, concert pianist Paul Orlac's new hands never truly were the murderer's; Orlac had only been falsely led to believe that they were. So, all along, his replacement hands were "good." Here's the Wikipedia article about the Silent film:

https://en.wikipedia.org/wiki/The_Hands_of_Orlac_(1924_film)

And here's the TMDb starter thread I've just now created for that film:

https://www.themoviedb.org/movie/2974-orlacs-h-nde/discuss/58c15b8cc3a3687dd90055ef

I highly recommend that movie, and think you'd like it.