I've had activity in that area abd above for years with degeneration and fusion. I can not lay on the floor on my back very long because it becomes to painful. I had surgery at L5/S1, L4/L5, L3/L4. Here is a pic done in 2005 of the area. It lacks some detail because I used my scanner to scan it onto the computer. http://home.triad.rr.com/blester/images/lumbars1l5b.jpg

Brent