The past week I've had a throbbing and almost at times a stabbing pain in my femur. It only occurs in one leg. The pain almost feels as though it's coming from the center of my bone. It's not a muscle pain. The pain seems to come around more as it gets later in the day. The pain occurs off an on, and is not constant. When it occurs it lasts for at least an hour. It happens several times a day. It happens more so at night. I have had no injuries or anything like that recently, or in that area in the past.