Fiona,i had Arthroscopic Surgery on my injured knee last May, before i had a scan and they failed to find anything wrong.Just cleaned the knee out with salt solution, it did not solve the problem.Then i had the scan which showed exactly where the problem was,they then tried cortisone,that has'nt worked either. So now after re-checking my Scan results,another operation because simply they know where to look. How can they be sure your Meniscus is damaged without a Scan? If i had my time to come again i would pay for my own Scan before anyone starts working on me with their cutting gear,if you get my drift.Take care and i hope everything goes well for you.