Bad injury, dont even worry about boarding right now, this is something that will affect the rest of your life.
What are their plans with the meniscus? What type meniscus injury is it?
Since your ACL went it makes it easier to repair the maniscus since they can really open the knee joint during surgery.
Ice the hell out of it and get into surgery ASAP so you can start recovery.
DO NOT PUSH IT! Rest it! Follow Doc's orders to the T.
When i have my bad injuries i play sim games on the internet to pass time. lol
If your interested give me a PM