AI Article Synopsis
- Higher body mass index (BMI) is linked to a higher risk of developing hip and knee osteoarthritis, leading to younger patients requiring total hip (THA) and knee arthroplasties (TKA).
- A study analyzed data from the National Inpatient Sample (2002-2017) and found a significant increase in obesity rates among patients undergoing THA (from 7.0% to 22.7%) and TKA (from 10.7% to 30.4%), along with a decrease in the average age of patients for both procedures.
- These findings highlight a concerning national trend where patients needing hip and knee surgeries are becoming both younger and more obese, corresponding with the rising obesity epidemic.
Article Abstract
Background: Higher body mass index (BMI) is a well-known risk factor for the development of hip and knee osteoarthritis and predicts total hip arthroplasty (THA) and total knee arthroplasty (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.
Methods: A retrospective analysis of the National Inpatient Sample database was conducted on patients undergoing primary THA and TKA for primary OA between 2002 and 2017. Analysis of variance and chi-square tests were performed to examine changes in age and obesity percentage over time, respectively. Pearson correlations were used to assess the relationship between patient age, BMI, and year of surgery.
Results: A total of 688,371 THA and 1,556,651 TKA were identified over the sixteen-year period. Between 2002 and 2017, the proportion of obese patients increased for both THA (7.0% to 22.7%, P < .001) and TKA (10.7% to 30.4%, P < .001). Mean age significantly decreased for both THA (66.7 to 65.9 years, P < .001) and TKA (67.6 to 66.8 years; P < .001). 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 (P < .001 for all).
Conclusion: THA and TKA patients have become younger and increasingly more obese throughout the obesity epidemic, as obesity rates have tripled over this time period. The current investigation is the first to demonstrate significant trends in both age and obesity in the THA and TKA populations on a national level.
Level Of Evidence: III.
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| http://dx.doi.org/10.1016/j.arth.2021.04.017 | DOI Listing |
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