I WAS BACKING MY TRUCK TO HOOK UP TO TRAILER I STOP TRUCK PUT IN PARK FROM REVERSELEFT MOTOR RUNNING GOT OUT STARTED WALKING TO BACK OF TRUCK WHEN THE TRUCK STARTED GOING FORWARD . I TRIED TO CATCH ITI GOT DOOR ALMOST OPEN WHEN I WAS CRUSHED BETWEEN MY TRUCK AN A PARKED FORD PICKUP I WENT TO HOSPITAL FOR CT SCAN LUCKY ONLY HIP CONTOSTION . DONE LOTS OF DAMAGE TO BOTH TRUCKS . I BELIEVE THE TRANSMISSION WENT INTO GEAR ON ITS ON ME GETTING HURT WAS MY FAULT FOR TRYING TO STOP TRUCK . I WAS IN MY ON YARD WHEN THIS HAPPEN.