AN A320 APCHING ORD; IL; ENCOUNTERS WAKE TURB ON THE ILS RWY 27L APCH COURSE. ACFT ROLLS 40 DEGS L BUT REGAINS FULL CTL. A FLT ATTENDANT IS INJURED.

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UPON INTERCEPTING ILS RWY 27L FROM A RADAR VECTOR AT 4000 FT MSL/210 KTS ASSIGNED; ACFT WENT INTO AN ABRUPT 40 DEG L BANK. WINGS WERE LEVELED AND LNDG UNEVENTFUL ON RWY 27L AT ORD. IN FRONT OF US WAS A B727 3-4 MI. AFTER BLOCK-IN AT GATE; INFORMED THAT ONE OF OUR FLT ATTENDANTS IN THE REAR FELL TO HER KNEES DURING THE ENCOUNTER. (THE LNDG ANNOUNCEMENT HAD BEEN MADE PREVIOUS TO THIS.) SHE WAS LIKELY PERFORMING HER LNDG CHKS IN THE CABIN. SHE COMPLAINED OF PAIN IN HER KNEES BUT WALKED TO COCKPIT. I HAVE NO FURTHER INFO ON HER CONDITION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE WAKE TURB CALLBACK STUDY. RPTR RPTED THE WAKE TO BE OF SHORT DURATION. HE FELT THE PF COULD HANDLE THE 40 DEG ROLL CAUSED BY THE WAKE. HE DIDN'T EVEN TRY TO TAKE CTL OF THE ACFT AT THE TIME. WAKE ROLLED THE ACFT BUT NOT MUCH ELSE HAPPENED. A FLT ATTENDANT WAS STANDING PERFORMING PRELNDG CHK IN THE CABIN; SHE WAS KNOCKED DOWN. THE FLT ATTENDANT WAS ABLE TO WALK OFF THE ACFT AT DEST. NO FURTHER WORD AS TO HOW SEVERE HER INJURIES WERE.