FLT ATTENDANT INJURY OCCURS DURING HARD BRAKING ACTION BY THE PIC OF AN OUTBOUND TAXIING B737 DURING A CLOSE GND CONFLICT WITH AN INBOUND TAXIING ACR Y ACFT AT ORD; IL.

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ATC FACILITY: ORD GND. LOCATION: INTXN OF TXWY A AND A14. OUR ACFT CAME OUT OF H2 HAD TAXIED OUT THE W LINE AND HAD BEEN CLRED BY ORD GND TO TAXI TO RWY 32L 'T10 BY B M2 M T.' WE WERE MOVING TOWARD A14 AND OUR NOSE WAS JUST OUT ONTO TXWY A WHEN WE RECEIVED AN URGENT CALL FROM GND ABOUT ACR Y AND AT THE SAME TIME WE SAW ACR Y MOVING AND TURNING RAPIDLY L ONTO TXWY A FROM TXWY F. TO AVOID ACR Y I HIT THE BRAKES HARD. ATC TOLD ME THAT ACR Y MISSED TXWY B WHICH THEY WERE SUPPOSED TO TURN L ONTO. I UNDERSTAND THEY HAD JUST CLRED THE RWY ON TXWY F AND WERE USING INBOUND GND ON 121.9. ORD GND THANKED US FOR STOPPING AND GIVING WAY. SINCE THAT WAS MY ONLY OPTION TO AVOID A BIG PROB; I WAS GLAD TO STOP. UNFORTUNATELY OUR #1 FLT ATTENDANT WAS THROWN AGAINST ONE OF THE CART RESTRAINING BRACKETS WHICH PROTRUDES FROM THE FORWARD GALLEY COUNTER AND HURT HER R ARM. I TALKED TO HER BEFORE DEPARTING. IT WAS BRUISED AND IT HURT; BUT SHE COULD CONTINUE ON. DURING THE FLT HER ARM SWELLED; GOT MORE PAINFUL AND SHE PUT ICE ON IT. SHE PLANS TO SEE COMPANY MEDICAL. I AM VERY SORRY SHE GOT HURT.