CABIN ATTENDANT BEHAVIOR PERSONAL INJURY DURING DSCNT IN A NIGHT OP.

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FLT ENCOUNTERED UNEXPECTED TURB. FLT ATTENDANT WAS SLIGHTLY INJURED IN THE TURB. FO WAS MAKING A PA TO THE PAX CONCERNING OUR ARR INTO SYR. INFO GIVEN CONCERNED SYR WX; EXPECTED ARR TIME; AND A STATEMENT ABOUT TURB WE EXPECTED IN THE SYR AREA. IT WAS AT THAT TIME THAT WE ENCOUNTERED STEADY MODERATE TURB. ALT AT THIS TIME WAS ABOUT 7000-8000 FT. SURFACE WINDS IN SYR WERE APPROX 20 KTS. THE TURB WE ENCOUNTERED UP AT OUR HIGHER ALT WAS UNEXPECTED. DURING THIS PA; WHILE THE FLT ATTENDANT WAS GETTING THE CABIN SECURE; THE FLT ATTENDANT WAS TOSSED AROUND BY THE TURB. THE FO AND I EXPECTED SOME TURB AT MUCH LOWER ALTS AND NOT OF THE SEVERITY WE ENCOUNTERED. THE TURB AT THE ALT WE FIRST ENCOUNTERED IT WAS DIFFICULT IF NOT IMPOSSIBLE TO PREDICT. I FEEL SORRY FOR THE FLT ATTENDANT AND HER INJURIES; BUT IF THERE WAS SOMETHING THE FO AND I COULD HAVE DONE TO HELP AVOID THE SIT; IT WOULD HAVE BEEN DONE. UNEXPECTED TURB OR ANY UNEXPECTED SIT FROM THE NORM CAN BE A POTENTIAL PROB OR HAZARD FOR ALL ON BOARD.