CABIN ATTENDANT BEHAVIOR PERSONAL INJURY SUFFERED AS LOSS OF ACFT CTL OCCURS AFTER ACFT EQUIP PROB MALFUNCTION IS EXPERIENCED.

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OUR AIRLINE USES AVERAGE WTS FOR PEOPLE AND BAGS. WE WERE OPERATING AT APPROX 75 LBS BELOW OUR MAX GROSS WT. WHILE DSNDING THROUGH 14000 FT AT APPROX 250 KIAS THE TRIM (RED) LIGHT CAME ON; ON OUR ALARM PANEL. THERE WAS ALSO A TRIM (RED) LIGHT ON MY FO'S FLT CTL PANEL. (WE WERE APPROX 5 DEGS DOWN.) IT SEEMED LIKE A SECOND HAD PASSED FROM WHEN I SAW THE RED LIGHT ON THE PANEL TO WHEN THE AUTOPLT DISCONNECTED. THE ACFT PITCHED UP TO APPROX 5-8 DEGS POSITIVE (TOTAL PITCH UP APPROX 10-13 DEGS). IT TOOK MY FO AND MYSELF APPLYING FORWARD PRESSURE ON THE YOKE; TO GET THE ACFT UNDER CTL AND BACK TO LEVEL FLT. THE TRIM WHEEL WAS ROLLED FORWARD TO ITS MOST FORWARD POS. THE PWR WAS REDUCED TO GIVE US AN AIRSPD OF APPROX 200 KTS AND A LNDG AT AVP WAS WITHOUT PROB. MY FLT ATTENDANT WAS HURT WHEN WE PUSHED THE ACFT OVER. SHE FELT AND HURT HER KNEE. AFTER TALKING TO OUR MAINT CTL PEOPLE THE AUTOPLT TRIM SYS WAS DEFERRED PER THE MEL. THE TRIM WHEEL WOULD ONLY TRIM PLUS 1.3 UNITS; WHEN THE OTHER ACFT IN OUR FLEET (13 OF THEM) GO PAST 2; NEGATIVE.