Miss stepped on grader latter causing operator to hold his entire body weight with his right arm on the entry handle so to not fall on grader blade. pulled his bicep muscle to a very painful state to which he could not curl his arm without pain level of 8 on a 1 to 10 scale. doctor ordered MRI may have torn muscle. MRI as of(5-2-2013)has not been done do to workmen's comp.