My grandmother had a new hip, I know she is much older than him but she found her pain was so much better very soon after the op
It's probably worth contacting your local social services to see if there is equipment they can give/loan him during recovery.
( Fluzzy namby-pamby pudding and pie, Thu 21 May 2009, 20:25, archived)

exoskeleton
with flame throwers would be something I want.
( Tyronne Get To Falkirk, Thu 21 May 2009, 20:26, archived)