(HealthDay News) — An estimated 4.5 million people are living with an artificial hip, and 6.7 million people in the United States are currently living with an artificial knee, according to a study presented at the annual meeting of the American Academy of Orthaopedic Surgeons, held from March 11–15 in New Orleans.

Hilal Maradit-Kremers, MD, from the Mayo Clinic in Rochester, Minn., and colleagues estimated the current prevalence of total hip arthroplasty (THA) and total knee arthroplasty (TKA) in the general population using calendar year-, state-, sex- and age-specific estimates of incidence rates from population-based data sources and the Dartmouth Atlas.

The researchers found that the 2010 prevalence of THA and TKA in the entire U.S. population was 1.5 and 2.2%, respectively. Among adults ≥50 years, the prevalence was 4.4 and 6.7%, respectively. For both procedures, the prevalence was higher in women than in men. Particularly for TKA, prevalence increased with increasing age (at 50 years of age: prevalence of THA was 0.7%, TKA was 0.6%; at 60 years: 1.9 and 2.9%; at 70 years: 4.6 and 8.4%; at 80 years: 10 and 16%).

“If current trends continue, this number is likely to increase in the coming decades and will create significant challenges for provision of specialized health care services, and for management of revision surgeries and long-term complications,” Maradit-Kremers and colleagues conclude.

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