How Your Spine Could Be Hurting Your Leg
Leg pain can originate from a number of reason that start in your spine. Your spinal cord is what carries the signals between your brain and your limbs, so if there is any damage on these signal pathways, your brain will be sure to let you know.
Source Wikipedia,en:Anatomography
Usually if you are experiencing leg, hip, or other lower body pain and suspect it originates from a back problem, you are dealing with a lumbar spine issue. Your lumbar spine is the section from your middle-back to your hips. Many things could be causing your pain such as foraminal stenosis, spinal stenosis, or maybe a disc has been ruptured and is compressing a nerve.
See other more specific conditions here.