Abstract
A biomechanical study was done to determine the safe range for cup abduction and cup anteversion and to compare range of motion when the neck and the inner-head of the hip prosthesis were altered.The results of this study showed that the safe range for cup abduction and cup anteversion that would allow physiologic range of motion without impingement was 50°-60° abduction and 10°-20° anteversion. It was also found that the smaller neck and the larger inner-head were better for expansion of the range of motion.
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