Top stories in health and medicine, November 27, 2012

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1. Moderate Activity May Be Key to Saving Knees. Too much exercise led to early degenerative cartilage changes in the knee in healthy people and in those at risk for osteoarthritis.

2. Supreme Court Remands ACA Mandate Case. The U.S. Supreme Court on Monday ordered an appeals court to reconsider an Affordable Care Act (ACA) case challenging the law’s employer mandate.

3. HCV Screening Benefit Still Uncertain. The value of screening for hepatitis C (HCV) remains an open question, according to three analyses intended to form the basis for new recommendations on the topic.

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