Hi, just wondering if this is a symptom from having had a L4/5 disk prolapse or if it is totally unrelated.. I have been having almost every night, cramp-like pain behind my knees, more often the left knee. I get the pain usually when I stretch my leg out straight and to relieve the pain I bend it straight away (like you would if it was an actual cramp). The pain doesn't go away immediately when I bend my knee, sometimes takes 30 seconds to 1 min before it subsides completely. I have mentioned this to my neurosurgeon and he thinks it is totally unrelated. Also says it is not possible to get cramp behind the knee. Sometimes I experience this a few times a night. Has anyone else had this? This only occurred after my first microdiscetomy surgery.