Abstract
Introduction
Body mass index (BMI) is a topical area of interest in the field of lower limb arthroplasty. It has been well established that BMI can influence post-operative outcomes. This study compares post-operative outcomes, including satisfaction rates, length of stay (LOS) and radiographic findings in different BMI groups following total hip arthroplasty (THA).
Methods
We retrospectively evaluated all non-navigated THAs performed at our institution from 2006–2016. Case-notes were reviewed for dichotomised satisfaction score, LOS and radiographic parameters including inclination, anteversion, limb length discrepancy (LLD) and offset discrepancy. Patients were classified into 4 groupings based on BMI (underweight (<24.5), healthy (24.5–30), obese (30–40), severely obese (>40)). Appropriate statistical analyses were performed to identify between group differences.
Results
A total of 6874 patients were included for analysis, (Male=2807, Female=4067, Age = 68.1, BMI=29.60). Satisfaction rates at 3 months and 1 year and LOS according to BMI are displayed in Table 1. Radiographic findings grouped by BMI are displayed in Table 2.
Discussion/Conclusion
Satisfaction rates for all categories of BMI were excellent at 3 months (96.90%-98.02%) and 12 months (95.94%-98.32%), with no clinically significant differences between groups. BMI was associated with a significantly longer LOS for the underweight and the severely obese compared to the healthy group. There was no clinically significant influence of BMI on any of the radiographic findings reported. The obese and severely obese groups were significantly younger than the underweight and healthy groups, indicating BMI does appear to have an effect on the age where THA is considered a suitable treatment option in this patient group.
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