ObjectiveSeveral 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.MethodsInitially 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.ResultsThe 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/m2. 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/m2, in general, experiencing a slight decline in the mean BMI of 0.08 kg/m2.ConclusionPatients who underwent TKA did not achieve significant reduction in BMI after surgery.

RESUMOCento e vinte e seis cabeças femorais retiradas durante artroplastias de quadril para tratamento de fraturas do colo do fêmur foram estudadas macroscopicamente e radiograficamente quanto ao traço de fratura e a existência de colo inferior que pode permanecer junto com a cabeça femoral.Chegou-se a conclusão que as fraturas do colo do fêmur obedecem a uma constância quanto ao traço de fratura, e que não existe a fratura subcapital verdadeira, pois em todos os casos analisados havia um fragmento de colo junto com a cabeça (esporão). INTRODUÇÃODevido a importância das fraturas de colo de fêmur, tanto pela sua freqüência quanto pela sua gravidade, existem inúmeras publicações sobre o assunto. Para classificar essas fraturas são citadas nos livros clássicos as classificações quanto ao deslocamento (GARDEN) (7) , quanto ao traço de fratura (PAUWELS) (14) e quanto a situação anatômica. A classificação anatômica, descrita nos livros texto de Rockwood (14) , WatsonJones (18)

Dislocation of the polyethylene component in knee arthroplasty is a rare complication. The main triggering factor is failure of the locking mechanism, which may result from technical errors of insertion, trauma or even implant failure. Here, a case of dislocation of the polyethylene component from the tibial base, nine years after revision arthroplasty, is reported. It is believed that this is the first such case reported in the Brazilian literature.

r e v b r a s o r t o p . 2 0 1 5;5 0(1):114-116 w w w . r b o . o r g . b r Relato de CasoLuxação espontânea do polietileno após artroplastia de revisão de joelho: relato de caso ଝ

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