B757-200 CREW BEGAN TKOF BEFORE ALL FLT ATTENDANTS WERE SEATED. A FLT ATTENDANT WAS INJURED AS A RESULT.

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FLT ATTENDANT ON DUTY. WE HAD A GND STOP FOR THE TUL-DFW LEG. AFTER THIS DELAY; WE TAXIED WITHOUT DELAY TO POS AND HOLD. I WAS MONITORING THE COMPLETION OF THE PREDEP PA/VIDEO WHILE IN POS AND HOLD. UPON COMPLETION OF THE TAPE; I GAVE THE PREPARE FOR DEP PA SHORTLY FOLLOWED BY THE CHIME. WE HAD PREVIOUSLY BEEN CLRED FOR TKOF AT OUR DISCRETION BY THE TWR. I ADVANCED THE PWR AND DEPARTED. DURING CLBOUT; WE WERE ADVISED THAT A FLT ATTENDANT FELL DURING THE TKOF ROLL WHILE RETURNING TO HER JUMP SEAT. WE CONTINUED TO DFW AND ADVISED DISPATCH TO NOTIFY MEDICAL. UPON ARR; SOMEONE FROM FLT SVC MET THE FLT AND ESCORTED THE FLT ATTENDANT TO MEDICAL. THE EXTENT OF HER INJURIES APPEARED TO BE A CONTUSION TO HER R WRIST AND SHE COMPLAINED OF A BRUISED HIP. LESSON LEARNED: GIVE MORE TIME FOR THE FLT ATTENDANT COMPLIANCE CHK PRIOR TO DEP. AT NO TIME DID THE PROCESS FEEL RUSHED; HOWEVER; IT IS OBVIOUS THE FLT ATTENDANTS NEEDED MORE TIME TO COMPLETE THEIR DUTIES. SUPPLEMENTAL INFO FROM ACN 501969: AFTER A 30 MIN DELAY AT THE GATE IN TUL; WE TAXIED TO RWY 36R. AT THE END OF THE RWY WE WERE CLRED FOR TKOF; BUT THE FLT ATTENDANTS WERE NOT READY. WE TOLD TWR THAT WE WERE NOT READY. THEY CLRED US FOR TKOF AT OUR DISCRETION. WE LISTENED FOR THE END OF THE TKOF PA; COMPLETED OUR TKOF CHKLIST. AFTER TKOF; WE WERE INFORMED THAT THE FLT ATTENDANTS WERE NOT YET SEATED AND THAT ONE FELL AND CUT HERSELF. SHE CAME TO THE COCKPIT AND INDICATED SHE WAS STILL DOING HER WALK-THROUGH. WE SHOULD HAVE TAKEN MORE TIME AFTER THE END OF THE PA TILL TKOF.