I have read about some people having spasms after surgery. Well I have experienced it. I am 1 1/2 months out, my grandson was outside playing & I thought he was getting too close to the road & he couldn't hear me call me. My husband was with him, but I didnt think he could see him, so out of a panic I walked very fast to stop him. Will he didnt go in the road and after making sure he was being watched, I went back in the house and sat down and started having a muscle spasm in my back. Bad one. Next day had one sliding my grandmothers walker out of my van. Not as bad though. I was wondering if this was because of what I was doing at the time and this should have been a NO NO.