A B737-700 FLT CREW RPTED THAT A FLT ATTENDANT WAS INJURED DURING APCH TO SLC DUE TO AN UNFORECAST TURB ENCOUNTER.

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DSCNT BEGAN FROM FL410 TO 10000 FT AND THE RIDE WAS SMOOTH WITH NO RPTED TURB FROM OTHER ACFT OR ATC. WX CONDITIONS WERE GOOD; JUST A FEW SCATTERED CLOUDS AND NO TSTM ACTIVITY ANYWHERE ALONG THE RTE. PAX SEATBELT SIGN HAD BEEN TURNED ON AFTER BEGINNING DSCNT FROM FL410. I HAD NOTIFIED THE FLT ATTENDANTS TO SECURE THE CABIN FOR ARR BY THE NORMAL 1 RING OF THE FLT ATTENDANT CALL. I DEPARTED 10000 FT AND PASSING 9500 FT ENCOUNTERED MODERATE TURB THAT ENDED AT 9300 FT. I RPTED THE TURB TO SLC APCH CTL. WE THEN RECEIVED A CALL FROM THE #2 FLT ATTENDANT INFORMING US THAT SHE HAD HEAD; NECK; AND KNEE INJURIES AND THAT SHE WOULD NEED PARAMEDICS AND WOULD NOT BE ABLE TO CONTINUE. ALL 3 FLT ATTENDANTS HAD BEEN STANDING IN THE AFT GALLEY WHEN WE ENCOUNTERED THE TURB; BUT ONLY THE #2 FLT ATTENDANT RECEIVED ANY INJURIES. PARAMEDICS MET US UPON ARRIVAL AT THE GATE; TREATED THE #2 FLT ATTENDANT IN THE AFT GALLEY AND THEN TOOK HER TO THE HOSPITAL FOR FURTHER TREATMENT. I NOTIFIED DISPATCH AND THE CHIEF PLT. SUPPLEMENTAL INFO FROM ACN 629165: DURING TAXI IN; WE WERE TOLD THAT SHE WAS BLEEDING FROM THE KNEE AND HEAD; AND THE REST OF THE FLT ATTENDANTS AND PAX WERE OKAY. WE PASSED THE INFO TO OPS. AT ARR AT THE GATE; THE PAX REMAINED SITTING AND THE PARAMEDICS WENT TO THE BACK TO ATTEND TO THE FLT ATTENDANT. AFTER PAX DEPLANING; THE PARAMEDICS REMOVED HER ON THE AISLE CHAIR. WE WERE LATER TOLD THAT SHE WAS TAKEN TO THE HOSPITAL AND WOULD THEN GO TO THE CREW HOTEL.