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

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

Pathological stipulations affecting the hip and knee joints occupy a selected position among the real orthopaedic entities have an effect on­ ing the extremities. at the one hand they're quite widespread and at the different they suggest for the sufferer obstacle of his skill to stroll, as a result of their enormous damaging results. A useful easy remedy of those joint illnesses (and right here osteoarthritis takes delight of position) is simply attainable if it stems from a competent biomechanical research of the conventional and pathological stressing of the joint in query. while the location within the hip could be thought of to be essentially clarified, a finished illustration of the knee continues to be missing, relatively whilst taking into consideration the most recent wisdom of biomechanics. lately our strategies of the kinematics of the knee were thoroughly replaced, however the clinically vital query of articular stressing continues to be unanswered. Dr. Maquet has conducted pioneer paintings during this box for a few years in adapting, by way of analogy, to the knee joint ideas already permitted for the hip joint. because the knee isn't really a ball and socket joint, a sophisticated challenge arises for which new techniques are precious. the result of the various operations conducted through Dr. Maquet in accordance with the biomechanical issues demon­ strate that his pondering is essentially right. exceptionally, it really is right here back confirmed (as past in relation to the hip) that therapeutic of osteoarthritis relies decisively on decreasing and lightly dis­ tributing joint pressure.

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

Example text

The following equations pertain: e=GX'sine e'= VX'sine e e' GX VX c=GX' sin 17 c, = VX' sin 17 c c' GX VX Consequently, the lever arms c and c' of force Pa and e and e' of force R3 are in the proportion: c c' e e' Therefore, taking one or the other of these centres as origin of the lever arms does not change anything in the equilibrium of the forces. This is true for any position of the knee since, from full extension to full flexion (Fig. 35 b and c), the line of action of the resultant force R must pass through the axis of flexion or geometric centre of the knee and through the instant centre.

560 kg =--_. 055 kgcm- 1 ·sec+ 2 ·acc Table 2. , of the body. In the direction of gait, the successive positions of the centre of gravity 57 are determined in relation to a coronal plane which moves along with a velocity corresponding to the average speed of gait. The successive distances of 57 from the mobile plane are entered as the ordinate on the graph. The abscissa represents the time as well as the phases of gait (Fig. 33). 4 It represents the horizontal displacement of 57 in the direction of gait.

For calculating the forces of inertia produced by the acclerations and decelerations of S7' the co-ordinates z of S7 are first entered into a graph. Its ordinate represents in centi- Z(cm) 98 97 96 '{ 21 o Fig. 31 . Oi placement in pace or lhe partial centre or gravity S, during the right single support period or gail. Tridimensional curve X(cm) 33 metres the vertical distance of 57 from the ground and the abscissa the time in seconds and the phases of gait (Fig. 32). The curve joining the successive co-ordinates z of 57 illustrates the vertical displacement of 57 during the step.

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