Resumo

DUARTE, Ricardo et al. Avaliação numérica e experimental da transferência de carga na articulação da anca com e sem prótese total. Rev. Port. Ortop. Traum. [online]. 2013, vol.21, n.3, pp.249-258. ISSN 1646-2122.

This study aims to evaluate the influence of the cartilage on the hip strain distribution. In order to compare the natural and implanted hip behavior, experimental and numerical models (based on synthetic bones) of the joint were developed. In this study models of the natural hip with and without cartilage were developed and an implanted hip model. The hip joint constituents were computationally developed through 3D scanning and subsequently generated a finite element tetrahedral mesh where constrains and boundary conditions were applied to approach the models to a real case. A 2300N load case was applied. The numerical and experimental validations were performed based on the principal strains. This procedure proved that the numerical models replicate the experimental ones with a difference of 7% and 9% for the natural and experimental models respectively. The numerical analysis of the natural hip joint, with and without cartilage, allowed assessing the major importance of the cartilage in the load transfer process. The presence of cartilage decreases the strains in the surface of the femur. Within the implanted model we registered the lowest strain values when assessing the strain distribution around the acetabular cavity. We also assessed based on the micromotion analysis between the interface bone-implant, that the superior region of the acetabular cavity is the region that plays the most influence concerning the implant stability and bone ingrowth mechanism.

Palavras-chave : total hip arthroplasty; Experimental tests; implant stability; finite element models.

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