Twisted back while dismantling and moving crusher equipment. Alledgedly happened on 7/15 but employee worked 7/16 & 7/17 then called off work on Mon. 7/19 and said he was going to the chiropractor. He was observed moving gingerly on 7/16 and when plant manager asked what happened he said he thought he may have twisted his back on 7/15 but that he would be ok.