EE WAS CROSSING OVER 42"" CLAY LINE AND SLIPPED, HITTING INSIDE OF RIGHT KNEE OVER NEXT SEVERAL DAYS EE LEG WAS STIFF AND SORE, BUT IMPROVING. FIVE DAYS LATER HE MOVED A LARGE TOOL OFF ONE OF THE TRUCKS AND FELT A PAIN IN HIS BACK. UPON RETURNING TO WORK, HE REPORTED BACK PAIN. WAS PLACED ON RESTRICTED DUTY 8/19.