I broke my lower lumbar spine (L3-5) in a car accident in 2004. I joined the Army as soon as I was out of my brace. I experienced some numbness sometimes during ruck marches and while running holding a weapon. I've been in 10 years now and only experienced lower back pain occasionally. I had my second son in December of 2013 and I had sciatica with him. When I started running again, I initially had no issues. Last October, however, I started having pain down the side of my right leg after 10 minutes or so of running. It gets increasingly worse when I continue. A physical therapist informed me that a nerve that runs between two of my fractured vertebrae runs right down the side of my leg, where I'm experiencing the pain. She said when I run, my spine is compressing and pinching that nerve. My question is, why would this just start now, after 10 years of running with it, and what can I do to stop it from happening? I need to be able to run. Thank you!