Abstract
Objective 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.
Methods A retrospective study of patients submitted to primary total hip arthroplasty. 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. Two national implants and six imported implants were included in the study.
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. The data were
analyzed regarding gender, age, fixation type and implant model.
Results 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 mean diameter of the native acetabulum was 54 mm in men and 52 mm in women.
Conclusion Out of the eight models studied, five were deemed adequate for the studied population.
The other three models available in our market (two national models and one imported
model) apparently require more appropriate sizing. We emphasize that anthropometric
studies of the Brazilian hip are necessary to give scientific subsidies to the ideal
implant design for our market.
Keywords
arthroplasty, replacement, hip - hip fractures - hip prosthesis - prosthesis design
