In reply to Frank the Husky:
Well I haven't had mine fused but was threatened with it haha...I got avascular necrosis of the scaphoid after breaking it for the 3rd time...all down to DH mtb. In fact it was the wrist which stopped me from enjoying riding.
The docs told me I would almost certainly need a fusion in the future. However here I am 25 years on and apart from the reduced ROM it is pretty good. I was also recently told (after an x-ray) that the 'dead' part of my scaphoid had mysteriously fixed itself and is now healthy bone?!?
I took up climbing about 1 year after my wrist had 'healed'. I'm certain that climbing regularly really helped it, stressing it and getting good blood flow through the area prompted the healing?
I have quite limited ROM in it but to be honest it only ever stopped me from doing one route, an E5 which had a high undercling that I had to get with the gammy wrist hand....couldn't bend it back far enough to get into the hold.
I don't know the extent of your mates injuries but there is hope!
I recommend finding an Amatsu therapist to help with rehab. Doing ice therapy and Wim Hof breathing exercises.