DSNDING INTO BOS OUT OF FL220 ON TEDDY STAR; B737-700 FLT CREW ENCOUNTER UNRPTED MODERATE TURB; CAUSING FLT ATTENDANT INJURY.

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ON DSCNT INTO PVD; IT HAD BEEN SMOOTH WITH SOME OCCASIONAL LIGHT CHOP. PASSING THROUGH ABOUT FL220 TO FL210; WITHOUT ANY WARNING; WE ENCOUNTERED MODERATE TURB AND CHOP. SHORTLY THEREAFTER; FLT ATTENDANT CALLED AND SAID THAT HE AND ANOTHER FLT ATTENDANT HAD BEEN KNOCKED DOWN; AND THAT HE FELL ON THE OTHER FLT ATTENDANT; AND THAT SHE HAD BEEN INJURED. WE TOLD HIM WE WOULD BE ON THE GND SHORTLY AND WOULD ORDER PARAMEDICS. ABOUT THIS TIME; DISPATCH CALLED TO UPDATE US ON PVD WX. WE ASKED HIM TO NOTIFY PVD AND HAVE PARAMEDICS STANDING BY. PASSING ABOUT 10000 FT; THE FIRST FLT ATTENDANT CALLED AND SAID THAT HE WAS CONCERNED THAT THE OTHER FLT ATTENDANT WAS GOING INTO SHOCK AND ASKED IF WE COULD COORDINATE TO HAVE THE PARAMEDICS BOARD BEFORE PAX GOT OFF. WE FLEW AN EXPEDITED APCH INTO PVD; AND THE PARAMEDICS MET THE ACFT. THEY CHKED THE FLT ATTENDANT OUT IN THE JETWAY AND THEN TOOK HER TO THE EMER ROOM. THERE WERE NO SIGMET OR TURB WARNINGS FOR THIS AREA AND WE HAD NOT RECEIVED ANY PIREPS. SHORTLY AFTER WE ENCOUNTERED THE TURB; AS I WAS TALKING TO DISPATCH; ZBW TOLD ANOTHER ACFT AND US OF MODERATE CHOP FROM 14000 FT TO FL180. INQUIRING ABOUT THE RIDE IN THE DSCNT MAYBE COULD HAVE PREVENTED THIS; BUT I'M NOT SURE. WE HAD SEVERAL FREQ CHANGES; AND I'M NOT SURE THAT PIREPS ARE PASSED FROM CTR SECTORS. IN THIS CASE; WE MAY HAVE BEEN THE FIRST ACFT TO RUN INTO TURB AT THIS ALT. IT CERTAINLY HIGHLIGHTS THE IMPORTANCE OF PASSING ON RIDE RPTS. SUPPLEMENTAL INFO FROM ACN 574290: FO FLYING TEDDY 2 ARR INTO PVD. AFTER MAKING FL290 XING RESTR 50 NM E OF NUK; ZBW CLRED US TO FL210 AND DIRECT BDL. IN DSCNT; ENCOUNTERED MODERATE TURB AND CHOP PASSING FL220. FASTEN SEATBELT SIGN WAS IMMEDIATELY TURNED ON. WE ADVISED PAX TO REMAIN SEATED UPON GATE ARR UNTIL THE PARAMEDICS HAD TREATED THE INJURED FLT ATTENDANT. COMPANY DISPATCH REVIEWED ALL WX RPTS AND PIREPS AND FOUND NO RPT OF TURB IN OUR AREA. PIREPS COULD HAVE PREVENTED THIS INCIDENT.