Originally Posted by
powers2b
No noobs were insulted in the making of this thread
You don't necessarily need a geared bike for a bad knee, and I honestly think the "fixed bad for knees" argument belongs with the brakes vs. brakeless crowd, even though Don's suggestion towards a geared bike had some good points.
If you have a knee injury, it's probably not going to help your recovery any to not let it rest when it needs to. While geared would certainly give more options than a single speed, going fixed with a bad knee is asking for trouble.