When I first read this yesterday I was a bit sceptical that he actually had an ankle infection and thought that somewhere along the line inflammation and infection had got mixed up etc. The first infection would probably not have been related to the surgical wound as it was far too late. It could potentially have been related to, for instance, a mesh if that was used in repairing the groin but I'd have thought not that likely. IIRC he was hospitalized for that infection which implies he needed IV antimicrobials and/or close monitoring. To then get an ankle infection 8 weeks or so on is certainly odd. Suggests either the problem didn't adequately resolve or some sort of underlying abnormality. Could be anything infected really (bone, muscle, joint capsule, skin). Be very odd IMHO if he was wearing a cast for an infection as would be potentially dangerous.