Schwartsmann Carlos Roberto, Borges Alexandre Moreira, Freitas Geraldo Luiz Schuck de, Migon Eduardo Zaniol, Oliveira Gustavo Kaempf de, Rodrigues Marcos Wainberg
Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil.
Complexo Hospitalar da Santa Casa de Porto Alegre, Porto Alegre, RS, Brazil.
Rev Bras Ortop. 2017 Jan 24;52(2):159-163. doi: 10.1016/j.rboe.2017.01.003. eCollection 2017 Mar-Apr.
Several studies show that patients undergoing total knee arthroplasty (TKA) tend to maintain or gain weight after the procedure, which would result in increased wear of the prosthesis and new surgical interventions in a smaller period of time in comparison with patients with adequate body mass index (BMI). The aim of this study was to investigate the effect of TKA surgery on these patients' BMI.
Initially the records were analyzed, chosen at random from 91 patients undergoing TKA during the period from August 2011 to July 2013. Patients were stratified by BMI as normal weight (BMI between 20 and 25), overweight (BMI between 25 and 30), and obesity (BMI > 30). They were re-evaluated in a minimum period of 18 months.
The mean age of the sample population was 68.1 years; 69.1 for men and 67.2 for women. The mean preoperative BMI was 27.24 kg/m. Among the study participants, in the preoperative period, 17 patients had normal weight, 65 were overweight, and nine were obese. Postoperative analysis showed weight loss in 41 patients (46%), and weight gain in 50 patients (54%). The mean postoperative BMI was 27.16 kg/m, in general, experiencing a slight decline in the mean BMI of 0.08 kg/m.
Patients who underwent TKA did not achieve significant reduction in BMI after surgery.
多项研究表明，接受全膝关节置换术（TKA）的患者术后往往会维持体重或体重增加，与体重指数（BMI）正常的患者相比，这会导致假体磨损增加，并在更短时间内需要进行新的手术干预。本研究的目的是调查TKA手术对这些患者BMI的影响。
最初对记录进行分析，这些记录是从2011年8月至2013年7月期间接受TKA的91例患者中随机选取的。患者按BMI分层为正常体重（BMI在20至25之间）、超重（BMI在25至30之间）和肥胖（BMI>30）。在至少18个月的时间里对他们进行重新评估。
样本人群的平均年龄为68.1岁；男性为69.1岁，女性为67.2岁。术前平均BMI为27.24kg/m²。在研究参与者中，术前有17例患者体重正常，65例超重，9例肥胖。术后分析显示，41例患者（46%）体重减轻，50例患者（54%）体重增加。术后平均BMI为27.16kg/m²，总体而言，平均BMI略有下降，为0.08kg/m²。
接受TKA手术的患者术后BMI没有显著降低。
