title: Body Mass Index Class Is Independently Associated With Health-Related Quality of Life After Primary Total Hip Arthroplasty: An Institutional Registry-Based Study.
abstract: The purpose of this study was to compare the health-related quality of life (HRQoL) of patients across World Health Organization (WHO) body mass index (BMI) classes before and after total hip arthroplasty (THA).
  
  
  
  Patients with end-stage hip osteoarthritis who received elective primary unilateral THA were identified through an institutional registry and categorized based on the World Health Organization BMI classification. Age, sex, laterality, year of surgery, and Charlson-Deyo comorbidity index were recorded. The primary outcome was the EQ-5D-3L index and visual analog scale (EQ-VAS) scores at 2 years postoperatively. Inferential statistics and regression analyses were performed to determine associations between BMI classes and HRQoL.
  
  
  
  EQ-5D-3L scores at baseline and at 2 years were statistically different across BMI classes, with higher EQ-VAS and index scores in patients with lower BMI. There was no difference observed for the 2-year change in EQ-VAS scores, but there was a statistically greater increase in index scores for more obese patients. In the regression analyses, there were statistically significant negative effect estimates for EQ-VAS and index scores associated with increasing BMI class.
  
  
  
  BMI class is independently associated with lower HRQoL scores 2 years after primary THA. While absolute scores in obese patients were lower than in nonobese patients, obese patients enjoyed more positive changes in EQ-5D index scores after THA. These results may provide the most detailed information on how BMI influences HRQoL before and after THA, and they are relevant to future economic decision analyses on the topic.
authors: Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York.
authors: Alexander S
authors: AS
authors: McLawhorn
authors: Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York.
authors: Michael E
authors: ME
authors: Steinhaus
authors: Department of Surgery, University of Michigan, Ann Arbor, Michigan.
authors: Daniel L
authors: DL
authors: Southren
authors: Department of Epidemiology and Biostatistics, Hospital for Special Surgery, New York, New York.
authors: Yuo-Yu
authors: YY
authors: Lee
authors: Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York.
authors: Emily R
authors: ER
authors: Dodwell
authors: Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York.
authors: Mark P
authors: MP
authors: Figgie
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000601:surgery; D015207:Osteoarthritis, Hip / Q000601:surgery; D010147:Pain Measurement; D011788:Quality of Life; D012042:Registries; D011795:Surveys and Questionnaires
keywords: body mass index; obesity; patient outcome assessment; quality of life; total hip replacement