I had a sciatic nerve problem where I would get stabbing pain in my legs and butt. The pain was so excruciating when trying to sit down that sometimes it would bring tears to my eyes. It would start as a lower back pain which was easily bearable but after a hard days work it would get really bad and turn into a jabbing nerve pain as I described. Ended up seeing a back specialist and had all the scans done. I was told I had Ankylosing Spondylitis and that I would never be healed. In the end I solved the problem myself. I did a soccer type kick, twisting my body in a quick motion. At this point my lower back made a huge popping sound and the nerve pain never came back and that was 15 years ago. What was happening was my sacroiliac joint was being compressed by the ligaments around it and making it look like I had arthritis because the space between the bones was closer than normal when in fact the material was still there, it was just compressed. Fucking back specialist first got mad then apologized after he took another X-ray.