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In case of artificial hip joint, the stem is fixed with osteo-cement, fatigue tests are performed to the artificial hip joint on specific patterns.
Then, roughly, 230 〜 2300 N of load is applied to it, five millions 〜 ten millions times of fatigue test are carried out to ensure the safety.
Furthermore, the strength is checked through FEM ( Finite Element Method ) to consider the stress-distribution in designing an artificial joint.
According to those analyses through FEM , we can see cases in which stresses are applied to an inner part and a screw-hole.
