Thanks Charley - they have replaced his hip completely as it was a displaced fracture within the capsule. Bizarrely when he fell I did not think he had broken anything as at that point he was not in much pain. We were contemplating how we might get him off the floor when he said (he was a doctor) that one leg was shorter and he thought he had fractured his femur, so asked for an ambulance.
Later that day it really did start to hurt, but I am hoping that it might be a bit less painful now the the op is done with. They are only giving him tiny doses of painkillers as he is so small and frail.