Employee was dragging a plastic driscol pipe up the ramp and lost his footing. While falling forward he twisted his back. Sought medical treatment on 7/29 and was released to full duty. Has been having intermittant back pain. Worked on 12/2 and felt tingling in is leg on 12/3. Went to the Doctor on 12/3 and was taken off work until further evaluation. First shift missed 12/3.