PLACED VEHICLE IN PARK AS IT SAT IN PARKING SPACE BESIDE THE GARAGE, WITH DRIVERS SIDE DOOR CLOSE TO EXTERIOR WALL. VEHICLE WAS RUNNING AT THE TIME. I WAS EXITING VEHICAL WHEN IT BEGAN TO MOVE FORWARD. RESULTING IN MY RIGHT LEG BEING TRAPPED WITHIN THE DOOR AS THE TRUCK DOOR HIT THE WALL OF THE GARAGE. I WAS THEN DRAGGED AND CRUSHED BETWEEN THE VEHICLE AND EXTERIOR WALL OF GARAGE, UNTIL MY BODY CLEARED THE END OF THE GARAGE AND I WAS RELEASED. UPON INSPECTING THE VEHICLE I FOUND THE TRANSMISSION WAS IN DRIVE INSTEAD OF PARK WHERE I HAD LEFT IT.