par Wagner, Jacques ;Bourgois, R;Baillon, Jean Marie ;Halleux, Pascale
Référence Acta orthopaedica Belgica (Ed. bilingue), 39, 1, page (217-244)
Publication Publié, 1973
Article révisé par les pairs
Résumé : The authors present the first results of comparative studies of several hinge prostheses and the mechanical behavior of the complex femur, prosthesis and tibia. The conclusion of a vectorial analysis is that muscle strain is less with a Guepar prosthesis. If the diameter of the bolts is sufficient to withstand the shearing and bending forces, there appears to be a weakness in their anchorage. The Silastic block in the Guepar prosthesis reduces the jerk during extension and lessens the strains by 25%. However, the authors have doubts of the resistance of Silastic. The cortical, femoral and tibial deformations (with and without total prosthesis) are registered for a 75 kg load. The measurements prove that diaphyseal strains increase with a short stem prosthesis and that its position is disturbed. Deformation is excessive when there is no valgus, but is more evenly distributed along femur and tibia if the implant has a long intra medullary stem. The final results of this comparative study of the implants are awaited before conclusions are drawn.