To generate a virtual human hip is a main goal for our research team. Also, starting from the normal virtual hip joint and using the important orthopedics information was defined the affected hip joint. All these models were generated in a 3D virtual environment starting with CT scanning images. Using an original method all the scanned CT images were re-defined and re-drawn and transferred to the 3D software. The resulted curves were used to generate the bones and the virtual complex system of both hip joints. With motion and geometric constrains the bio-mechanical assemblies were defined, starting from anatomical information. The normal hip joint and the model of the affected hip were defined and exported to ANSYS, software based on Finite element analysis.

The aim of this paper is to compare the range of motion of the sit-to-stand (STS) movement angles for the both knees: osteoarthritic (OA) left knee and healthy right knee, for seven subjects who performed an experimental test consisting of STS cycles on a chair. The acquisition system consists of two electro-goniometers, one for each leg, for making possible the simultaneously reading of data during experiments. The angular amplitudes of human knee flexion-extension during the STS cycles are obtained as data files. For each knee of all subjects were selected 8 consecutive cycles which were normalized by interpolation with cubic Spline functions, using MATLAB environment. The final medium STS cycle for both knees is obtained. Finally, statistical analyses are made and the results are presented. The maximum values of the knee angle for both knees of all seven subjects were compared and tested with an unpaired Student t-test, considering α=0.05. The p-values corresponding to this test are calculated using ANOVA. Based on the average anthropometric data the virtual model of a mannequin using SolidWorks software was developed, and then was transferred to ADAMS simulation environment in order to obtain the variation laws of reaction forces in the lower limb joints.

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In this paper, using 3D finite element method and starting from the virtual model of the human knee joint-prosthesis assembly, we investigate the effects of antero-posterior tibial slope on contact stresses in the three components of total knee prosthesis. Using AnsysWorkbench15.07 software, the stress and displacements maps are obtained for knee-prosthesis assemblies and for their components, considering two loading force: 800N and 2400N and two cases of prosthetic knee varus slope: 176o and b) 191o. For each prosthesis-knee assembly and for each considered force, two variants of antero-posterior tibial slope were considered: 00 and 50.

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