EMPLOYEE WAS WALKING UP THE STAIRS WITH A BAG OF NUT & WASHERS, WHEN HIS METATARSAL BOOTS GOT CAUGHT ON A PIECE OF 3/4"" CONDUIT STICKING UP 4""-6"" ABOVE THE WALKING SURFACE. HE TRIPPED AND FELL , CATCHING HIMSELF IN A FORWARD FALL WITH BOTH HANDS, TWISTING HIS BACK.