that newspaper is kind of a tabloid, so it's possible that it distorted what this Dr. Rudiger said.
i however believe that mentioned blood poisoning is possible.
it would usually happen very very slowly, so that the concentration doesn't become dangerous,
but for doing as much sport as a tennis pro, there might be insufficient studies yet.
this blood poisoning surely isn't an imediate danger, but it may reduce life expectancy.
if his docs informed Murray about this concern, he would not necessarily decide against it, but may also take the risk.
i'm more curious if he will sustain a fracture though.

afaik, this surgery is far advanced, but the stress tests are not fully conclusive yet (and there is a lot of stress on the hip in tennis).