'Very sorry to hear about that. Be really really diligent about the excersizing post-surgery. After doing the knee recovery thing myself a few years back, I'm really not kidding how important that is. I wasn't so diligent like a big weenie and it took me way too long to get back at it. Luckily, we're heading into the winter season and that'll make it easier to resist hopping on once the bike parts are in place!