IN A FRONT-TO-SIDE CAR COLLISION IN WHICH OUR CAR SPUN 180 DEG., ROCKING THREE CHILDREN IN THE REAR, THE CHILD IN THE MIDDLE SUSTAINED A LACERATION IN HER ARM REQUIRING STITCHES, FROM THE SHARP EDGE OF THE UNDERSIDE OF THE ARM OF THE COSCO BOOSTER SEAT NEXT TO HER. THE THIN PADDING ON THE ARM HAD FALLEN OFF AND WOULD NOT HAVE PROTECTED HER IF IT HAD REMAINED ATTACHED. SHE WAS SEATED, BELTED, BETWEEN TWO NEARLY IDENTICAL COSCO BOOSTERS: #22-298-HRS 11/18/02 BB1G 4359-2066 AND #22-296-WAL 6/19/06 P503A. WE HAD RENTED THE SEATS AND THE CAR IN DENVER, CO., FROM THRIFTY AUTO RENTAL. *NM