My surgery was August 13th. I told the home nurse about the cramps I was having and she was surprised I wasn't prescribed some type of relaxant. I have 2 kinds of spasms. The one behind the knee is caused by motion. I will actually cramp up and not be able to move until the cramp eases. The second type is what I call "zingers". They come out of nowhere on the sides of my knee and sometimes on the top. They don't last long, but wow, are they intense! I sent an email to my OS and was prescribed Methocarbamol. It has made a huge difference! I'm taking it between 3 and 4 times a day. It's been keeping the spasms at bay and because it's a muscle relaxant, my muscles are less tight and I'm able to move a little better. Good luck to you.