EE was riding the hoist car down the sloper when the brakes locked up and jammed his back against the seat. He went to Logan General where x-rays were negative and was released to work. Due to continuing pain, EE visited Dr on 5/16/12 and was put off work until 5/23/12. On 5/23/12 EE visited Dr again and was excused from work until 6/1/12.