AAOS: Prevalence of U.S. Total Knee Replacements ~5 Percent

More than 4.5 million Americans currently have an intact primary total knee replacement

FRIDAY, Feb. 10 (HealthDay News) -- Prevalence estimates show that approximately 4.7 percent of the U.S. population aged 50 years or older currently has an intact primary total knee replacement (TKR), according to a study presented at the annual meeting of the American Academy of Orthopaedic Surgeons, held from Feb. 7 to 11 in San Francisco.

Alexander M. Weinstein, from the Boston University School of Public Health, and colleagues investigated the number of individuals in the United States living with knee implants. Using a state-transition, computer-simulation model, the prevalence of primary TKR was estimated, stratified by age and gender. To calculate the number of Americans currently living with an intact primary TKR, prevalence estimates were combined with 2009 census data.

The researchers found that more than 4.5 million Americans have an intact primary TKR, representing 4.7 percent of the population aged 50 years or older. TKR prevalence is 5.3 percent in females and 4.1 percent in males. Among adults aged 60 to 69 years, 4.9 percent of women and 4.1 percent of men have had at least one knee replacement, with the percentages increasing to 8.2 and 7.1 percent, respectively, for those aged 70 to 79 years. Among adults older than 80 years, approximately 10 percent have had at least one knee replacement.

"Among persons older than 50 years of age, TKR has become considerably more prevalent than rheumatoid arthritis or congestive heart failure. Knowledge of TKR prevalence is useful in planning health services specific to the population living with TKR," the authors write.

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