The employee bent over to pick up a metal H beam and moved the beam over to the rib. When the EE lifted the beam he twisted his lower back. EE cont. to work and did not rec. any medical treatment until 9/29/10. The EE ret. to his reg. duties on 9/30/10. The EE cont. to hurt and went back to the Dr. on 10/6/10. The Dr. placed EE on restricted duty on 10/6/10.