The present study was motivated by the practical perception that, in some situations, the implant models seemed very large for our patients, sometimes requiring an adaptation of the individual to the implant and not the opposite, which would be desirable.Īfter reviewing the literature, the authors did not find data describing the average size of implants used in hip arthroplasty surgeries in the Brazilian population, or specific anthropometric studies regarding the Brazilian hip. The correct choice of implants is of paramount importance, and the preoperative planning must be individualized to each patient for perfect restauration of hip biomechanics and function. These replacements generally fall into three distinct groups according to the type of implant fixation: cemented, non-cemented and hybrid (in which only one of the components is fixed with bone cement). The basic concept of the procedure is the replacement of the degenerated joint surface by prosthetic components with innumerable design variations, fixation types and tribological pairs. Total hip arthroplasty represents one of the most revolutionary and successful surgical procedures in modern medicine, providing symptom relief and improving quality of life. We emphasize that anthropometric studies of the Brazilian hip are necessary to give scientific subsidies to the ideal implant design for our market. The other three models available in our market (two national models and one imported model) apparently require more appropriate sizing. Out of the eight models studied, five were deemed adequate for the studied population.
The mean diameter of the native acetabulum was 54 mm in men and 52 mm in women. The analysis of 682 hips submitted to total hip arthroplasty demonstrated that 2 models of cemented femoral stems and 1 of non-cemented stem did not seem to be perfectly adequate for the femoral morphology of the studied population, since these 3 implants were mostly used in the smallest size available, resulting in a non-Gaussian curve. The data were analyzed regarding gender, age, fixation type and implant model. Every patient was treated by the same group, with one of the four senior authors or under their strict supervision, following the same surgical technique. Two national implants and six imported implants were included in the study. Patients with femoral or acetabular morphological deformities that could influence the choice of implant size, including dysplasia and previous fractures, were excluded from the study. To determine if the dimensions of selected national and imported implants used in total hip arthroplasty surgeries are adequate regarding the anthropometric profile of the Brazilian population.Ī retrospective study of patients submitted to primary total hip arthroplasty.
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