PLACED CAR IN PARK EXITED CAR AT WHICH TIME THE CAR BEGAN TO MOVE IN THE REVERSE CATCHING MY LEG IN THE DOOR UPON MY EXIT CAR STARTED TO MOVE AT WHICH TIME I WAS DRAGGED UNDER THE CAR. MY LEFT LEG & KNEE STOPPED THE CAR FROM CONTINUING TO MOVE WHICH TRAPPED ME PARTWAY UNDER THE CAR. WITH WHEEL WELL RESTING ON MY LOWER BODY. EARLIER IN THE TRIP I HAD DIFFICULTY MOVING THE GEAR SHIFT INTO PARK AS IT SEEMED TO GET STUCK AND MAKE IT DIFFICULT TO TRANSITION INTO PARK. THIS CAUSED A PAINFUL AND DIFFICULT ACCIDENT. HAS THIS TYPE OF ACCIDENT BEEN REPORTED BEFORE. HAVE REPORTS OF THIS TYPE OF SITUATION OCCURRED OR BEEN REPORTED AS A PROBLEM?.THIS NEEDS TO BE FULLY LOOKED INTO SO THAT NO ONE ELSE SUFFERS THE PAIN THAT I HAVE ENDURED.