TITLE

CAD-model-based Design and Stress Analysis of Resurfacing Hip Joint Prosthesis

AUTHOR(S)
Ming-Chu Shieh; Lin, Alan C.
PUB. DATE
September 2012
SOURCE
Computer-Aided Design & Applications (Computer-Aided Design & Ap;2012, Vol. 9 Issue 5, p609
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Artificial hip replacement arthroplasty has been developed and practiced in orthopedic surgery for many years. The conventional method is total hip replacement system consisting of a femoral stem and head and acetabular socket. However the high stress between the femoral head and the acetabular socket often causes stress shielding effect to occur and consequently results in the failure of the artificial hip replacement surgery. This study aims to provide an alternative solution to the aforementioned problem with hip resurfacing surgery. The CAD model concept for the design of resurfacing hip joint system is to eliminate stress shielding effect caused by conventional stemmed hip joint system. In this study, finite element analysis is employed to compare resurfacing hip joint system, stemmed hip joint system, and natural hip joint with regard to medial and lateral femur stress, and strain distribution on the femur in order to discuss the applicative characteristics of the two different surgical procedures of artificial hip joint replacement. The research finds that the metal femoral stem causes the stress distribution on the femur and the amount of force to the femur to differ significantly from that with natural hip joint and thus causes stress shielding effect to occur and subsequently post-operative complications such as osteoporosis and osteolysis. On the other hand, the stress to the femur in resurfacing hip joint system is homogeneously distributed to the femoral body and closer to that with natural hip joint. It significantly reduces the stress, via press-fit femoral neck resurfacing prosthesis, Minimized stress shield effect from happening, and lowers the possibility of femoral fracture. This study is therefore able to determine the advantages and disadvantages of resurfacing hip joint system in comparison to conventional stemmed hip replacement system.
ACCESSION #
88857645

 

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