Pellegrini CA, et al. - The weight change patterns preoperatively and postoperatively among overweight/obese knee replacement patients are investigated in this study. Overweight and obese patients initially lost weight amid the interval including knee replacement; however, they were less likely to lose more than 2.5% of their weight in the 1 to 2 years immediately after the surgery. Knee replacement patients may benefit from weight management interventions both preoperatively and postoperatively.