I have experienced hip, low back, pelvic and groin pain fro over a year due to an injury. I fell directly onto my left sitting bone onto a concrete fall. Pain is achy, burning, crampy and extreme at times. i have difficulty walking and sitting. MRI s of lumbar spine and pelvis with nothing significant. I have recently found a hard lump on my upper spine near my lower ribs on the left side. This is very hard and very sore to touch. Could this be the cause and should i get further medical attention.