PLT RPT; B767ER HIT MODERATE TURB. 3 CABIN ATTENDANTS INJURED. PAX MD DIAGNOSED BROKEN LEG. PARAMEDICS MET FLT; TOOK CABIN ATTENDANT TO HOSPITAL.

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POSSIBLE PROBS AND PREVENTIVE MEASURES: THE PROB SEEMS TO BE IN THE AMOUNT OF TIME IT TAKES TO STOW THE SERVING CART; AS IT WAS APPROX 7-10 MINS FROM NOTIFICATION TO SIT DOWN UNTIL THEY WERE INJURED. SOLUTION: POSSIBLY A SERVING CART THAT CAN BE COVERED AND STRAPPED DOWN QUICKLY; SO THAT THE FLT ATTENDANTS CAN TAKE THEIR SEATS. THERE ARE MANY TIMES THAT WE HAVE A MUCH SHORTER WARNING OF TURB. WE WERE 150 MI E OF IMB ALONG J15; CRUISING AT FL350. FLT ATTENDANTS WERE SEATED AND THE SEATBELT SIGN WAS ON. WE ENCOUNTERED LIGHT TO MODERATE TURB. ATC ADVISED THAT TURB WAS RPTED TO FL390. A LEARJET RPTED SMOOTH AIR AT FL410 NE OF OUR POS. FL410 WAS SMOOTH FOR SEVERAL MINS. FLT ATTENDANTS OK'D TO TRY SERVING. ABOUT 5 MINS LATER; WE STARTED TO GET LIGHT TURB AGAIN. I HAD THE FLT ATTENDANTS DISCONTINUE SVC AND TAKE THEIR SEATS (SEATBELT SIGN STILL ON). ACFT RPTS OF FL310 AS BEING SMOOTH. I REQUESTED AND RECEIVED CLRNC TO FL310. WE STARTED DSCNT AT MACH .78; 1000-1500 FPM; LIGHT CHOP THROUGH FL370; THEN WE STARTED TO SMOOTH OUT. THEN AT FL350; LIGHT TO MODERATE TURB. SPD BRAKES WERE EXTENDED TO INCREASE RATE. JUST ABOUT FL330; 80 NM E OF IMB; WE RECEIVED A COUPLE (2) OF MODERATE JOLTS. IT SMOOTHED OUT BELOW FL320 AND LEVELED OFF. AT THAT TIME; WE RECEIVED A CALL FROM FLT ATTENDANT #1 THAT FLT ATTENDANTS HAD BEEN INJURED IN REAR OF ACFT. ONE WAS ON THE FLOOR WITH A LEG INJURY (FLT ATTENDANT #2). WE LATER FOUND OUT 3 OTHERS HAD MINOR INJURIES. FLT ATTENDANT #3 BUMPED HER HEAD; FLT ATTENDANT #3 HAD A HEAD ABRASION; FLT ATTENDANT #4 HIT HER HEAD AND BRUISED HER KNEE. A PHYSICIAN ON BOARD VOLUNTEERED TO LOOK AT THE FLT ATTENDANTS. HE DIAGNOSED FLT ATTENDANT #2 TO HAVE A POSSIBLE FRACTURE OF THE LOWER LEG. A DEADHEADING PLT WAS ASKED TO ASSESS THE SIT IN REAR ACFT AND HELP GET FLT ATTENDANT #2 STRAPPED IN A SEAT (LAST ROW). I NOTIFIED FLT CTL AND REQUESTED PARAMEDICS N PDX. STATION OPS NOTIFIED AND PARAMEDICS WERE CONFIRMED. THE REMAINDER OF THE FLT WAS UNEVENTFUL. THE FLT WAS MET BY PARAMEDICS AND PDX FLT ATTENDANT SUPVR TOOK FLT ATTENDANTS #2; #3; AND #4 TO HOSPITAL FOR OBSERVATION.