I had several acupuncture sessions because i've had persistent swelling/dull throbbing pain (not really pain but my knee doesn't feel comfortable) and it did work for me initially but it hasn't after about 4 sessions. Also, it is not really a solution, more a means to an end ie. a way in alleviating pain/swelling. That is, unfortunately, i don't think acupuncture will cure a scar tissue or the reason you are having pain. My physios and my OS have both told me that acupuncture isn't the solution and after seeing my OS last week, i've been told I have loads of scar tissue (and other problems meaning I am still getting swelling and the dull throbbing pain) and will need a further arthroscopy to sort the issue.
I'm not sure if an arthroscopy would be the step forward for you. I think the best approach would be to see a GP/OS about your problem.
Good luck with sorting your knee out!