In a recent article published in the Journal of Arthritis and Cartilage, published on-line on January 15, 2010, researchers followed 106 adults with unilateral end stage osteoarthritis of the knee and 31 patients without knee pain who participated as control subjects in this perspective longitudinal study. They found that the BMI (body mass index, which is a measure of a patient’s weight and height) increased significantly over two years for the total knee replacement group but not for the control group. Fifty-six percent of the people in the surgical group gained weight over the two-year follow-up period, gaining an average of 14 pounds. The control group did not gain weight; therefore, it was felt that the weight gain cannot be attributed to the effects of aging. The researchers felt that counseling regarding nutrition and weight management is important in patients undergoing joint replacement as the relief of pain and improvement in function will not in and of itself lead to weight loss.