Estudo da estabilidade dos componentes na artroplastia total do joelho sem cimento

Abstract

ObjectivesDetermine the stability of tibial and femoral components of 20 cementless knee arthroplasties with rotating platform.MethodsThe 20 patients (20 knees) underwent an analysis of dynamic radiographs with an image amplifier and maneuvers of varus and valgus which were compared to static frontal and lateral radiographs of the knees and analyzed by two experienced surgeons in a double-blind way.ResultsWe could observe in this study that both methods showed very similar results for the stability of the tibial and femoral components (p<0.001) using the Kappa method for comparison.ConclusionThe tibial component was more unstable in relation to the femoral component in both static and dynamic studies. Level of Evidence IV, Case Series.

Complications after Total Knee Arthroplasty

“…Titanium causes more osteolysis than cobalt and chromium. Giant cells that develop against abrasive particles act by forming a membrane [153]. Particle size is important for this mechanism.…”

“…The particle sizes range from 1 to 100 micrometers under the electron microscope. Large parts do not cause osteolysis [153]. There is no osteolysis if the parts are not spread to the cancellous bone, so osteolysis is not seen when Complications after Total Knee Arthroplasty DOI: http://dx.doi.org /10.5772/intechopen.89818 the cancellous bone is properly covered with cement [154].…”

Avaliação do desgaste do polietileno de uma prótese de joelho nacional ultracongruente de base rotatória

“…Total knee arthroplasty with a rotating platform has theoretical biomechanical advantages over a fixed-platform design. 5 These advantages include an improvement in kinematics by increasing the range of motion, facilitating axial rotation, better distribution of stress between the femoral and tibial components, and reduction in release forces at the implant interface with the bone. 6 7 8 Many variables can influence the frictional wear behavior of polyethylene, like the design of the prosthesis, the raw material used, and the surgical technique applied and the patient's morbidities, such as the activity level and body mass.…”

“…A ATJ com plataforma rotatória apresenta vantagens biomecânicas teóricas sobre um desenho de plataforma fixa. 5 Estas vantagens incluem uma melhora da cinemática, aumentando a amplitude de movimento, facilitando a rotação axial, uma melhor distribuição das tensões entre os componentes femoral e tibial, e uma redução das forças de soltura na interface do implante com o osso. 6 7 8 Muitas variáveis podem influenciar no comportamento de desgaste por atrito do polietileno, sendo elas o desenho da prótese, a matéria-prima utilizada, a técnica cirúrgica aplicada, e as morbidades do paciente, tais como o nível de atividade e a massa corpórea.…”