Study of multidirectional sliding motion of hip joint and its effect on lubrication of artificial hip joint

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A goniometer was developed by which the relative motion between a femoral head and cup surface could be evaluated. For a conventional goniometer, careful collinear positioning is required to minimize the cross talk. But the goniometer developed can be used with no careful positioning. The center of hip joint is calculated through the least square method basing upon a mechanical link model. The angular motion of each subject was evaluated. It was confirmed that the slide track of each subject showed a quite unique pattern and was varied from person to person.