EE WAS ASSISTING WITH REMOVAL AND REPLACEMENT OF CONVEYOR BELTING AND ACTING AS A SPOTTER DURING REMOVAL. AS BELT WAS PULLED TIGHT IT JUMPED OVER SMALL RETAINING WALL AND STRUCK EE ON OUTSIDE OF LEFT KNEE. MEDICAL EVALUATION SHOWED STRAIN. EE MUST WEAR KNEE BRACE AND WILL BE ON RESTRICTED DUTY UNTIL COMPLETION OF PHYSICAL THERAPY.