Effect of body mass index on duration of total knee replacement surgery: A prospective cross sectional study

Obesity and increased BMI has raised concerns throughout the globe. As obesity is often associated with many serious medical conditions. Obesity, older age and gender are major contributing factors for knee replacement surgeries. We aimed to compare the mean duration of surgery in obese and non-obese patients undergoing total knee replacement.

A Cross-sectional study is conducted at the orthopedic department at Shifa international hospital, Islamabad during June 2021-Dec 2021. Study is conducted to assess the effect of BMI on duration of total knee arthroplasty. Sample size was calculated to be 105 with 95% confidence limit. Data will be analyzed using SPSS version 22. Quantitative variables like age, BMI and duration of surgery were presented as mean and standard deviation. Qualitative variables like gender, laterality (unilateral/bilateral), and ASA were presented as frequency and percentage.

There were more females undergoing the procedure than males. The predominant age group was found to be 56-65 years. On BMI classification scale, a far greater number of individuals were found to be obese constituting more than ⅗ of the study population and almost ⅕ of the patients were overweight. The Association of BMI Classification & Duration of Surgery has a significant p value of 0.00.

A linear and direct relation was observed between body mass index and duration of surgery. There may be other contributing factors and will need more data and research.