Aim: To analyze the influence of body mass index (BMI) on functional outcome in overweight and obese patients after total knee replacement (TKR).
Material and Method: The patients who underwent primary TKR between January 2002 and December 2010 were retrospectively reviewed. The mean follow-up period was seven years. The knees were divided into the groups according to the World Health Organization classification based on BMIs and overweight, class 1 obese, class 2 obese patients were assessed. The clinical outcomes of the groups were compared by evaluating the Oxford Knee Score (OKS), visual analog scale (VAS), and Short Form-36 physical component summary (SF-36 PCS) and mental component summary (SF-36 MCS) scores.
Results: The lowest scores were obtained in class 2 obese group. However, the differences of OKS, SF-36 PCS, and SF-36 MCS and VAS between the groups were not found to be statistically significant. The mean ages of the groups were 67, 64 and 62 respectively (p<0.05). Class 2 obese group underwent surgery at a younger age compared to the others.
Discussion: Clinical outcome after TKR was not affected by BMI at a mean seven years follow-up in overweight, class 1 obese and class 2 obese patients.