Jo had some infiltration done for his knee, basically a blood injection, which is the risky "shock" treatment to avoid having to rest for months. Clearly, Gilles didn't choose that option.
I think he did, I'm pretty sure I read in the paper when Jo had it and they mentioned Gilles had it before. They just didn't report it when Gilles had it. Okay, maybe I shouldn't say for sure, there's always a chance that my translation machine messed thing up
. Let's just assumes things always got lost in translation