. we use an actuarial model to assist management in determining an appropriate level of accruals for product liability claims . historical patterns of claim loss development z i m m e r h o l d i n g s , i n c . 2 0 0 9 f o r m 1 0 - k a n n u a l r e p o r t %%transmsg*** transmitting job : c55340 pcn : 030000000 ***%%pcmsg|30 |00011|yes|no|02/24/2010 00:22|0|0|page is valid , no graphics -- color : d| .