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1000N
5%
207/3801
1200N
64%
2442/3801
1800N
8%
303/3801
2200N
10%
389/3801
3600N
395/3801
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The new joint force (J) calculated is 1200N as shown in Illustration A. The joint force decreases as the acetabular component is moved medial. This is a result of decreasing abductor tension as the acetabular component is medialized (Distance B is 50mm instead of the initial 100mm). Mechanical equilibrium is when the sums of all forces and moments equal zero [(AT x A) - (5/6BW)x B)) = 0]. Free body diagrams show the locations and directions of all forces and moments acting on a body. The body and the left leg weigh 5/6 x total body weight (BW) in a right-sided single leg stance as given in this example. The article by Johnston et al created a mathematical hip model that found that the loads on the hip were lowered by placing the center of the acetabulum as far medially, inferiorly, and anteriorly as possible.
2.7
(46)
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