I agree with whats been said by Greg and Pierre. I busted a knee a few years ago (ruptured patellar tendon doing army stuff) and then repeatedly tried to go back and exercises too soon on it.
Now 5 years later it still give me trouble (yesterdays box jumps and run flared it up) and i'm pretty sure it's because i never fixed the problem when it happened initially.
Get a physio to check you out and if you need to stretch your ITB and quads or get some release work done DO IT!
Only go looking for sleeves, supports and other gear if you've busted it properly and need it to keep exercising.