EE was operating unit #1882 backhoe, EE stepped off the machine when he was getting off the backhoe his foot slipped off of the step and he twisted his knee. At that time the EE refused medical treatment and cont. to work. His knee began to hurt him more and he wert to doctor and has continued to work. Will have surgery on 2/6/12 and will be off 4 to 6 weeks.