Study finds, Effects of the Obesity Epidemic on Total Hip an
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Higher body-mass index (BMI) is a well-known risk factor for the development of hip and knee osteoarthritis (OA) and predicts total hip and knee arthroplasty (THA and TKA) at an earlier age. The purpose of this study is to document the nationwide trends in age and obesity in primary THA and TKA throughout the obesity epidemic.

Patients undergoing primary THA and TKA for primary OA were studied retrospectively using the National Inpatient Sample database. Changes in age and obesity percentage over time were investigated using analysis of variance and Chi-square measures, respectively. The relationship between patient age, BMI, and surgery year was evaluated using Pearson correlations.

Results:
--A total of 688,371 THA and 1,556,651 TKA were identified over the sixteen-year period.

--The proportion of obese patients increased for both THA (7.0% to 22.7%) and TKA (10.7% to 30.4%).

--Mean age significantly decreased for both THA (66.7 to 65.9 years) and TKA (67.6 to 66.8 years).

--Over time, BMI significantly increased (THA: r =0.221 vs. TKA: r =0.272) and patient age decreased (THA: r =-0.031 vs. TKA: r =-0.137) for both procedures.

Finally, during the obesity crisis, THA and TKA patients have become younger and more obese, as obesity rates have tripled over this time span. On a national level, the current study is the first to show major increases in age and obesity in the THA and TKA populations.

Source: https://www.sciencedirect.com/science/article/abs/pii/S088354032100379X?dgcid=rss_sd_all
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