CABIN ATTENDANT INJURED WHEN MODERATE TURBULENCE ENCOUNTERED DURING DESCENT INTO ROA.

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APCHING ROA; WE WERE GIVEN PLT'S DISCRETION FROM 10000 TO 6000'. THE CAPT CALLED THE F/A; TOLD HER WE EXPECTED TURB; TO CLEAN UP THE CABIN AND BE SEATED. WE STARTED A DSCNT AT 29 MI OUT. THE AIR WAS SMOOTH WITH OCCASIONAL LIGHT CHOP. THE AIRPLANE WAS SLOWED IN ANTICIPATION OF TURB. APCH GAVE US A FURTHER DSCNT TO 3800'. THERE WAS A SCATTERED TO BROKEN CLOUD LAYER IN THE AREA. WE WERE ABLE TO AVOID MOST BUT PENETRATED 1 CLOUD ON DSCNT. WE ENCOUNTERED MODERATE TURB AS WE DSNDED THROUGH THE CLOUD LAYER. BENEATH THE LAYER WE HAD A CLEAR VIEW OF THE ARPT; CALLED IT IN SIGHT TO APCH CTL AND WERE CLRED THE VISUAL. WE ENCOUNTERED A SECOND AREA OF MODERATE TURB IN THE CLR ON THE APCH UNTIL TURNING FINAL. THE F/A RPTED TO US ON THE GND THAT SHE HAD HIT HER HEAD ON A STORAGE BIN AND BUMPED HER BACK ON AN ARM REST. SHE WAS NOT; HOWEVER; INCAPACITATED. AS THERE WERE ONLY 8 PAX ON BOARD; THE F/A DID HAVE TIME TO CLEAN UP AND BE SEATED. HOWEVER; SHE HAD UNDONE HER SEATBELT TO CLEAN OUT A SEAT POCKET.