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A late-August headline on MedPage Today ominously read, “MI Risk Soars After Joint Replacement.” The article cited a recent Arthritis & Rheumatology study that found a more than 8-fold increase in risk of myocardial infarction (MI) for one month after knee replacement and a more than 4-fold increased risk during the month after hip replacement, all compared with equal numbers of matched controls who did not have joint replacement surgery.
A look at the absolute risk instead of the relative risk, however, reveals a different and less scary story. For example, among the 13,849 patients who underwent knee replacement, 306 (2.2%) had a heart attack within the first month after surgery.
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