The specific causes of lower back pain remain illusive. Studies show eight in ten people experience back pain at some point in their lives. A federally-funded University of Kentucky study is focusing on the mechanics of the back. Dr. Babak Bazrgari is a biomedical engineer at UK. He says age is a factor. "We are seeing like as they get older, they perform activities like the way that they move their trunk is such that it impose a higher load on the spinal column," said Bazrgari.