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Johnson & Johnson has undergone a series of product withdrawals and recalls in recent years, including the recall of artificial hips, contact lenses and other products, and the recent decision to end its line of drug-coated heart stents.
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The six degrees of freedom of bone-implant relative position, magnitude of the hip contact force (L), and spatial direction of L were the random variables.
Hip contact forces during normal walking, which is one of the most frequent dynamic activities in daily living, are imposed on the pelvis.
The survival time of the reconstruct in wet condition is less than 10% of that in dry condition under a given applied hip contact force.
In this study a three dimensional virtual femur bone is modelled using Solid Edge V19 and the bone is analysed for hip contact stresses/forces during normal walking, standing, running and jumping activities.
As the Australians veered out to cut off the opposition attack, the two pairs made hip contact.
The hip contact force was set at 5340 N with a sinusoidal loading mode (ratio Fmin/Fmax = 0.1).
The resultant hip contact force was set at 3800 N to simulate a higher strain as in overweight or active patients.
Comparable increments of peak hip contact forces were reported for stair climbing, one-leg standing and bridging exercises, whereas dynamic hip abduction and chair rise exercises resulted in lower loadings [ 36].
With a hip contact force of 3800 N the contaminated titanium alloy neck adapters failed after 3 million cycles (range 2.7 to 3.3) while no failure occurred under clean interface conditions (run-out limit 10 million cycles).
For these customised test, the hip contact force was set at 2300 N for 5 million cycles according ISO 7206-8 1995(E) followed by a stepwise load increase (Locati method 500 N, 1 million cycles) until failure.
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