Right knee (inside MCL??) and just below knee

I feel I just can't put weight on my right knee after arthroscopy almost three weeks ago -  and the pain is about 2 cm below knee on the inside extending around knee and downwards to lower limb.  I think it's the area of MCL.  Should I get another xray /mri scan?   There is slight swelling but the 'look '  of it isn't as bad as the pain I'm experiencing and I just can't get about.   It's particularly bad when twisting.   But even going straight forwards involves some twisting I find!    It feels like a sprained knee. 

Marie, can you ask someone at the hospital where it was done, if this is normal?  I did find this http://www.nhs.uk/Conditions/Arthroscopy/Pages/Recovery.aspx which I thought MIGHT help but hopefully if there are others on here who have had a similar procedure, they might be able to ffer more insight from their own experience.  I hope you can get reassurance though.  If you're able, I'd be inclined to give the hospital a quick ring and ask.

Look up 'pes anserine' see if it fits.