The reason I went into the Urgent Care was for my lower back issues. After the doctors addressed the heart issues, they concentrated on my initial problem with my back which after X-rays and a CTscan turns out to be Spinal Osteoarthritis. In doing some looking here on the site, it seems it has been more previlent in knees.. I have been doing the common treatments, heat/stretch/cold, TENS devices along with lidocaine patches but is still persists. The next step is probably to see a spine specialist and possibly cortisone shots.