I may have a strained muscle in my lower back. I think it might be something else because it hasn t gotten better at all in almost a whole month. ~I can bend backward without pain ~I have a limited amount of forward movement (I can only go to 90 degrees with my legs straight but I do so without pain) ~When or how I experience pain is completely unpredictable; I don t know what causes pain, I ll reach down to grab something off the table and my back spasms. No one movement spasms the same way each time. ~I have worked very little in the past 4 weeks ~It spasms more often when I get up from a sitting position, but sometimes it wont.