Sen. Charles E. Grassley, R-Iowa, sent a letter to Zimmer Holdings asking the company to disclose information on how it monitors the long-term performance of its artificial hips and knees and manages feedback from surgeons. A Zimmer statement said the company welcomes discussion regarding its policies and added that "this feedback can lead to modifications and improvements to products, their labeling and the manner in which we train and educate surgeons about our products."

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