Download Biomechanics of the Knee: With Application to the by Docteur Paul G. J. Maquet (auth.) PDF

By Docteur Paul G. J. Maquet (auth.)

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Additional resources for Biomechanics of the Knee: With Application to the Pathogenesis and the Surgical Treatment of Osteoarthritis

Example text

G: knee 47 (X) Stylization From which we get: Let us begin the analysis by considering the tibia as a straight line G C with G as the superior point (Fig. 45). The directional cosines of line G C can be calculated since the angles formed by the projection ofthe tibia and the vertical in the plane x z parallel to the gait, ¢ 4' and in the plane y z transverse to the gait, 1/14' are known for each phase of the step (Fig. 37). It is easy to go from these known angles ¢ 4 and 1/14 to the directional cosines of the tibia GC with a length t.

The weight of the part of the body supported by the loaded knee will be called P. It can easily be calculated by adding the weights of its constituent parts. 56 kg, which is about 93 % of the body weight. F or didactic reasons, the action of the partial weight P on the knee will first be analysed in a coronal plane, then in a sagittal plane. In each of these planes the intervening forces correspond to the projection of the forces acting in space, in the respective planes. Tensor Fasciae Tract Fig.

Point B is determined by angle b formed by axes Gu and GB. Force F can be considered as the componen t parallel to t of the resultant of muscular tensions. Measures on anatomical cross sections, between point G and the muscles and tendons which surround the knee, let us give r a mean value of 5 cm. For each phase the muscular force is thus located by the angle e. Muscular and ligamentous forces have also a component in the plane of the disc. All the forces in this plane are brought to Nand Q with the characteristic that their point of intersection B is on a circle of radius r'.

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