Operating D-10 dozer on the fill. He had turned his front lights and fender lights off to dismount machine. While dismounting he missed grabbing the handrail located on the deadlink causing him to fall backward pinning his left lower leg and foot between deadlink and pusharm causing him to fall to the ground. X-rays were negative. On 10-14-05, injury became L.T.A. Poss.MCL injury.