CAR WAS IN PARK ON DRIVEWAY ON A HILL, WHEN I WAS CLIMBING IN CAR DROPPED FROM PARK TO REVERSE AND STARTED ROLLING BACK DOWN THE DRIVEWAY. MY LEFT FOOT WAS STILL OUT OF THE CAR THE DRIVERS SIDE TIRE CAUGHT MY LEFT FOOT AND I WAS DRAGGED OUT OF THE CAR. I WAS SEVERELY INJURED, OPEN FRACTURE OF RIGHT ANKLE, LARGE AND DEEP LACERATION BEHIND RIGHT KNEE, EIGHT BROKEN RIBS RIGHT SIDE AND A COLLAPSED LUNG RIGHT SIDE. TRANSMISSION SLIPS OUT OF GEAR FROM PARK TO REVERSE.