Trends of Obesity Rates Between Patients Undergoing Primary Total Knee Arthroplasty and the General Population from 2013 to 2020. (16th March 2022)

• Record Type: Journal Article
• Authors: Muthusamy, Nishanth; Singh, Vivek; Sicat, Chelsea S.; Rozell, Joshua C.; Lajam, Claudette M.; Schwarzkopf, Ran
• Is Part Of: Journal of bone and joint surgery. Volume 104:Number 6(2022)
• Publication Date: 2022-03-16
• Subjects: Bones -- Surgery -- Periodicals; Joints -- Surgery -- Periodicals; Orthopedics -- Periodicals; Orthopedics; General Surgery; Bone Diseases; Joint Diseases; Bones -- Surgery; Joints -- Surgery; Orthopedics; Bot (anatomie); Gewrichten; Chirurgie (geneeskunde); Periodicals; Electronic journals; Periodicals; 617.47005
• DOI: 10.2106/JBJS.21.00514
• Languages: English
• ISSNs: 0021-9355

Abstract

Abstract : Background: Obesity is a recognized risk factor for severe knee osteoarthritis. However, it remains unclear how obesity prevalence trends in the current population undergoing total knee arthroplasty (TKA) compare with those seen in individuals not undergoing this procedure. In this study, we assessed the yearly trends in body mass index (BMI) and obesity rates between patients who have undergone primary TKA and those in the general population. Methods: We retrospectively reviewed all patients ≥18 years of age from January 2013 through December 2020 who underwent primary, elective TKA and those who had an annual routine physical examination at our institution within the same period. Baseline demographic characteristics were collected. The independent samples t test was used to compare means and the chi-square test was used to compare proportions between the 2 cohorts, and a linear regression was used to determine the significance of the yearly trends. Results: A total of 11, 333 patients who underwent primary TKA and 1, 158, 168 patients who underwent an annual physical examination were included in this study. After adjusting for age, we found the mean BMI for the TKA group to be significantly greater (p < 0.001) every year compared with the annual physicals group. The proportion of patients who were categorized into any obesity class (BMI, ≥30 kg/m 2 ), Class-I obesity (BMI, 30 to 34.9 kg/m 2 ), Class-II obesity (BMI, 35 to 39.9 kg/m 2 ), and Class-III obesity (BMI, ≥40 kg/m 2 ) was significantly higher for the TKA group each year compared with the annual physicals group. An analysis of trends over time showed a significantly increasing trend (p < 0.001) in BMI and obesity rates for the annual physicals group, but a stable trend for patients undergoing TKA. Conclusions: Patients who underwent TKA continued to have higher BMI than the general population, which showed a steady increase over time. Physicians need to continue in their efforts to educate patients on weight management and healthy lifestyles to potentially delay the need for a surgical procedure. Level of Evidence: Prognostic Level III . See Instructions for Authors for a complete description of levels of evidence.