HIT FROM BEHIND ,REARENDED,. FIRST IMPACT THREW ME FORWARD THEN HIT AGAIN 2ND IMPACT BROKE SEAT BACK AND I FELL BACK FLAT INTO BACKSEAT.. 2 TORN ROTATOR CUFFS AND SHOULDER BALL AND SOCKET DAMAGED DUE TO TRYING TO HOLD ONTO WHEEL AND MAINTAIN CONTROL OF CAR WHILE SEAT WAS COLLAPSING. *TR