When a doctor said that knee replacement would reduce her arthritis pain by 75 percent, Lake was overjoyed. “I thought the knee replacement was going to be a cure,” said Lake, now 52 and living in rural Iowa. Most knee replacements are considered successful, and the procedure is known for being safe and cost-effective. Rates of the surgery doubled from 1999 to 2008, with 3.5 million procedures a year expected by 2030.
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