The Effect of Total Knee Arthroplasty on Body Mass Index—A Prospective Study

Osteoarthritic patients, who need a total knee arthroplasty, usually complain of knee pain as the major reason to forbid them from exercising to lose weight. Weight gain, in turn, worsens the process of osteoarthritis as a vicious cycle. In our prospective study, we calculated the preoperative and 1-year post-operative body mass index (BMI) after total knee replacement. We prospectively followed up 91 patients in the knee arthroplasty clinic. Height, preoperative weight, and post-operative weight at 12 months were measured, and the pre- and post-operative BMIs were calculated. All the perioperative factors of the patients were without any major change. The mean preoperative BMI was 31.08, and at 12-month follow-up, the mean BMI was 30.11. This difference was not statistically significant. The results obtained in our study suggest that there is no statistically significant difference between the pre- and post-operative BMIs at 1-year follow-up. 退化性關節炎的病患者，當需要接受全膝關節置換術(TKA)時,通常抱怨主要因為膝痛以致不能透過運動去減輕他們體重，反而增加體重後令到退化性關節炎惡化，形成一個惡性循環。 在我們的前瞻性研究中，我們計量全膝關節置換手術前和手術後受一年的身體質量指數(BMI)。 我們前瞻性地追蹤在膝關節置換門診裡的91位病患者。 測量 他們的高度，手術前和手術後受一年的體重並計算他們的BMI。那些病患者的手術前後因素都沒有很大的變化。 手術前的BMI平均值是31.08，12個月後的BMI平均值是30.11。這個差別在統計學是無效的。 我們的研究結果顯示手術前和手術後受一年的BMI平均值在統計學是沒有分別的