I blew out my LCL. I was in the midst of a divorce, changing jobs, and my ex-wife (still married at the time) dropped me from her insurance. This was despite the fact she agreed to keep me on it until my insurance kicked in.
Anyway, I had no insurance, so just sucked it up and wrapped it myself. I break out my old crutches and just went to work. To make matters worse, I pushed it. I was trying to work out again and my knee felt fine, so I start a bunch of silly martial arts katas. Low and behold, I step on a toy twist awkwardly and messed it up again. More self rehab and finally 4 years later it is mostly normal.
I highly recommend swimming as a form of rehab.