Optimizing the configuration of cement keyholes for acetabular fixation in total hip replacement using Taguchi experimental design

Abstract Cement fixation of the acetabular component is increasingly recognized as a common site of loosening when hip replacements fail. Cement keyholes drilled into the acetabulum have been recommended to improve this fixation but little is known of the optimum positions or sizes of these holes. T...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine Journal of engineering in medicine, 1999-01, Vol.213 (6), p.485-492
Main Authors: Mburu, G, Aspden, R M, Hutchison, J D
Format: Article
Language:English
Subjects:
Acetabulum
Analysis of Variance
Biological and medical sciences
Biomechanical Phenomena
Bone Cements
Hip Prosthesis
Humans
Medical sciences
Models, Theoretical
Orthopedic surgery
Prosthesis Design
Prosthesis Failure
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
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Summary:Abstract Cement fixation of the acetabular component is increasingly recognized as a common site of loosening when hip replacements fail. Cement keyholes drilled into the acetabulum have been recommended to improve this fixation but little is known of the optimum positions or sizes of these holes. This study investigates the diameter, depth and number of keyholes to be drilled to maximize the failure torque in a model system. A Taguchi experimental design was used to identify the most significant factors and to predict the best configuration of keyholes within the constraints of the experimental test rig. One hole at each of the pubic, iliac and ischial sites, of 12 mm diameter and 6 mm depth, was found to be the optimum configuration. The failure torque was most strongly dependent on the hole diameter in the pubic region, decreased with increasing hole depth and was not sensitive to the number of holes.
ISSN:0954-4119
2041-3033
DOI:10.1243/0954411991535095