You should listen to your doctor and do what ever he/she says. Generally, I believe rest is strongly recommended. If you must catch, ask your doctor about sitting on a bucket. It may be boring for a few weeks, but you'll be able to get back into playing sooner and at a higher level of mobility if you do what your doctor says.
I understand that you feel like it's going to set you back from being able to catch and it doesn't. We've had a couple of athletes that are going through it themselves and I like most people got it also when I was young.
Oz-good-schloters.. technically kinda like growing pains. If you're looking to stay in the game, compete and heal quicker consider this suggestion.
Being a catcher means being fit.... if you have medical conditions then it may be fine as long as it is fine with your docter. Being a catcher means a lot of knee pains if you think you can do it GREAT! BUt dont over work yourself