I OPENED MY POWER LIFT GATE USING MY KEY FAB. AFTER PUTTING ITEMS IN THE BACK, I PUSHED THE CLOSE BUTTON LOCATED ON THE LIFT GATE. I THOUGHT I HAD LEFT MY KEYS LAYING INSIDE WITH THE ITEMS I HAD JUST PLACED IN THE BACK OF THE VEHICLE. KNOWING THAT THE SENSORS WOULD READ THAT MY ARM WOULD BLOCK THE DOOR FROM CLOSING, I COULD RETRIEVE MY KEYS. AS IT CONTINUED TO CLOSE, I REALIZED THAT IT WAS NOT RECOGNIZING MY ARM. AS I TRIED TO PULL MY ARM AWAY FROM THE DOOR, IT CAUGHT MY THUMB AND CRUSHED IT. IT REMAINED CLOSED IN THE BACK HATCH UNTIL HELP ARRIVED TO OPEN IT WITH THE KEYS. I WENT TO MY DR AND RECEIVED XRAYS. I FRACTURED MY THUMB AND AM CURRENTLY RECEIVING PHYSICAL THERAPY TREATMENT. I AM CONSTANTLY IN PAIN. WHEN I CONTACTED GENERAL MOTORS, I WAS BRUSHED OFF.