I also just came out of knee reconstruction. Luckily, my joint is still okay. However, I tore my ACL, MCL, and meniscus playing ball. After a little over a year I am finally at the point that I can run 2-3 miles without pain. Biking is a fantastic part of knee rehab and one of the best things you can do! Try to hop in the pool occassionaly for a good low impact workout as well.