Influence of Design Parameters on Cup-Stem Orientations for Impingement free Range of Motion in Hip Implants
Tarun Goswami (Advisor), Richard T. Laughlin (Committee Member), David B. Reynolds (Committee Member)
Master of Science in Engineering (MSEgr)
The objective of this investigation is to determine the optimum positions of the prosthesis in total hip arthroplasty that produce least amount of impingement. Theoretical ranges of six basic hip motions were determined under walking, stumbling, internal rotation at 90 flexion and external rotation at 0 extension with 15 abduction, using mathematical models and validated for impingement using finite element analysis. A generalized approach, where impingement does not occur, was developed in this study to understand influence of design parameters such as head-neck ratio, neck-shaft angle, oscillation angle, and stem offset on cup-stem orientations such as cup inclination, cup anteversion, and stem antetorsion. Stems with head-neck ratio lower than 2.3 and neck shaft angle greater than 135 did not impinge. For impingement free range of motion, cups should be anteverted more when stems with high neck shaft angle are combined with low stem offset and antetorsion.
Department or Program
Department of Biomedical, Industrial & Human Factors Engineering
Year Degree Awarded
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