INJURED RETRIEVED 2 SHEETS OF 7/16"" OSB (4 X 8 PLYWOOD) FOR BOXCAR LOAD, REALIZED NONE WAS NEEDED, SO WHILE ATTEMPTING TO PLACE THEM BACK ON STACK, HAD THEM STANDING ON THEIR EDGE, THEN SLIPP ED OFF STACK, LANDING ON TOP OF FOOT, BEHIND SAFETY STEEL TOE.