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

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

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Extra info for Biomechanics of the Knee: With Application to the Pathogenesis and the Surgical Treatment of Osteoarthritis

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I I I I I I / / / , / , / / /' k1 ,, / I / / , I , I I I I I I I / I / I , / I I I I / , , I I ~ .......... / / / \ I ~ Braune and Fischer designated a point in the knee which retains a constant location in the lower extremity of the femur. They established its coordinates for each phase of gait. This point, however, cannot be used as such for the calculation of the forces because it does not coincide with the geometric axis of flexion of the knee. The location of this axis of flexion in the femur changes with motion because the shape of the femoral condyles does not have the same radius of curvature throughout.

It varies from 3 to 8 cm. We can adopt r' = 10 cm for all cases in order to calculate N, Q, and b. This can be done since the value of r' does not intervene for R, F, 8, and r' can obviously be such that the point B is outside the limb. The results of these calculations are reported in the three first columns of Table 7. Thus we know the force R, the compression force transmitted from femur to tibia through point G. But it can cross the axis of flexion of the tibia on the femur anywhere between the centres of curvature 0 1 of the medial condyle and O2 ofthe lateral condyle, without disrupting the equilibrium.

48). For that one must find out the point where the perpendicular drawn from S7 crosses the plane. Be it H' the coordinates of which are: Uw __ _ '-_~ _ _ _ __:_l _ _ _ T II ___ _ H' Fig. 48. Plane perpendicular to the tibial plateaux and determined by the line of action of P. H: point of intersection of the line of action of force P with the plane IT . H ' : projection of the partial centre of gravity S7 in plane IT As shown in Figure 48 , T=P· cos /} and HH' =S7H· cos/}o Calculation gives: cos ext + YG· cos f3 t + ZG .

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