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
D1 : distance from point G to line HH' crosses point G, the centre of the axis of flexion of the knee. It is between dotted curves. These give the extreme values which R can attain by displacement on the axis of flexion of the knee between the centres of curvature 0 1 of the medial condyle and O 2 of the lateral condyle. The results allowing one to draw the curve have been obtained by supposing that the full load is exerted on the knee at phases 12 and 23. 66 kg (phase 23) at the end of the stance on the right leg.
The radius of curvature of the weight-bearing surfaces of the femoral condyles is longer in extension of the knee and is different for both condyles. During motion, the axis moves in a sagittal plane located between the femoral condyles. The path of this axis forms a curve called the" Evolute" by Fick (1910). Therefore, it is necessary to know for each phase of the gait where the axis of flexion is located on the curve. This point must then be plotted within the system of coordinates. The" Evolute" of Fick was first drawn on the knee of subject I of Braune and Fischer and its system of coordinates (Fig.
The lateral arrows indicate the force supported by each knee I Q I I I I I 5 lcm=lQkg I I I lQcm 21 2. Forces Exerted on the Knee in Standing on One Limb When the subject stands on one foot, the loaded knee supports the head, the trunk, the upper limbs, the loaded thigh, and the opposite lower limb. The mass of this part of the body can be considered concentrated in the centre of gravity S7 (Fig. 17). S7 is distinct from the centre of gra vity S6 of the whole body. The weight of the part of the body supported by the loaded knee will be called P.