The Hands of Orlac

The Hands of Orlac (Orlacs Hände) (1924)
A concert pianist, Paul Orlac (Conrad Veidt), loses his hands in a railway accident. Replacement hands are transplanted onto him in an experimental procedure, but the hands are those of a recently-executed murderer. From now on the pianist is tortured by panic attacks and irrational fears. He believes that with the hands of the murderer he has also gained the murderer's predisposition to killing. Strange signs and bizarre threatening letters reinforce these fears. When his father is killed, with whom he was on bad terms, the pianist is suspected of the murder. He only finds peace by clearing up the plot.

There were two direct remakes:
Mad Love (USA 1935) with Peter Lorre, directed by Karl FreundThe Hands of Orlac / Les mains d'Orlac (GB/FRA 1960) with Mel Ferrer and Christopher Lee, directed by Edmond T. Gréville.