I'm pretty sure of it. Why would you need an MRI? It should've been an x-ray and an immediate diagnosis if it was a problem in his bones. Even if it's not cancer it could be something wrong with the nerves in his hands. Nerves/Veins in your hand is extremely important and fragile, one of the most complicated parts to operate. My grandmother had a problem in her hand and had to get surgery and now she can't move her fingers properly. This might be the end of olof.
Leg, shoulder and arm injuries aren't even that hard to operate on.