Regarding Japanese daily activities, there are a lot of situations of dislocation for persons after total hip arthroplasty. The objective of this research is to obtain an installation position and a shape of an artificial hip joint which reduce the risk of the dislocation even if the people do Japanese daily activities. Two magnetic positional sensors attached to body surface are used to measure motions of a hip joint between Westerner dairy and Japanese activities. As a result, adequate conditions of the artificial hip joint suitable for Japanese daily activities can be obtained.

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