A320 CABIN CREW REPORTS ENCOUNTERING SEVERE TURBULENCE CAUSING INJURY TO ONE.

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WE EXPERIENCED SEVERE TURB ON APCH WITH NO COM FROM THE COCKPIT ABOUT PREDICTED TURB. WE DROPPED AT LEAST 50 FT OR POSSIBLY MORE. I ALLOWED A PAX TO SIT ON THE JUMPSEAT. HE WAS COMING OUT OF THE AFT LAVATORY AND THERE WAS NO PLACE FOR HIM TO SIT. I STRAPPED HIM IN FOR HIS SAFETY. SUPPLEMENTAL INFO FROM ACN 797050: FLT ATTENDANT INJURY/FAR JUMPSEAT TOWARDS THE END OF THE FLT MAYBE THE LAST 20 MINS WE HIT SEVERE TURB. THE SEATBELT SIGN CAME ON. I WENT OUT TO CHK SEATBELTS AND PICK UP REST OF GARBAGE IN CABIN WHEN I GOT ABOUT ONLY 3 ROWS FROM AFT OF ACFT WHEN I WAS THROWN L THEN R ON PAX ARMREST/SEATBACK AND THEN FELL TO THE GND IN THE MIDDLE OF AISLE. I HURT MY LEG AND SHOULDER/ARM. I HELD ON AND THEN CLBED ON TO A PAX SEAT FOR THE REMAINING OF THE FLT. THIS WAS SEVERE TURB AND NOT 'MODERATE' THAT THE PLTS HAD MENTIONED. ALSO; I LATER DISCOVERED THERE WAS A PAX SITTING ON THE JUMPSEAT FOR LNDG. APPARENTLY HE WAS IN THE LAVATORY WHEN WE HIT THE TURB AND MY FLYING PARTNER ADVISED HIM TO TAKE NEAREST SEAT FOR HIS SAFETY; THE PAX SAFETY; AND ALL THE OTHER PAX IN THE CABIN.