Chiropractors can do adjustments on most joints mine does soft tissue treatments also.
I wonder if something has just popped out in your knee and needs to be re aligned? Are you hyper mobile or loose jointed?

I just got my computer fixed this week after it being messed up for almost a month- so i must have missed what your accident was.

Also if your hips or any part of the body is misaligned it will cause things down the chain to change or hurt.

My daughter was having a lot of knee problems and the chiro did an evaluation and a small adjustment to her hips -she hasn't complained of knee pain since.