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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.53  No.3 (2012)  >  pp.565-570

MATERIALS TRANSACTIONS
<<Previous article Vol.53  No.3 (2012)   pp.565 - 570 Next article>>

Bone Loss and Reduced Bone Quality of the Human Femur after Total Hip Arthroplasty under Stress-Shielding Effects by Titanium-Based Implant

Yoshihiro Noyama1)2), Takuya Miura1), Takuya Ishimoto1), Takahiro Itaya1), Mitsuo Niinomi3) and Takayoshi Nakano1)
1) Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
2) Department of Research and Development Division, Nakashima Medical Co., Ltd.
3) Department of Biomaterials Science, Institute for Materials Research, Tohoku University


The present work was aimed at clarifying the stress-shielding effect caused by hip-joint implantation into a femur by using a human cadaver with a cementless hip implant. In particular, bone quality was assessed from the standpoint of preferential c-axis orientation of biological apatite (BAp). Comparing the implanted side to the non-implanted side, a finite element analysis (FEA) indicated that artificial hip-joint implantation had a significant stress-shielding effect on the femur. The results also showed a marked decrease in the degree of preferential BAp orientation as well as bone loss in the medial-proximal femur. This is the first report showing a reduction in the degree of preferential BAp orientation due to a stress-shielding effect after artificial hip-joint implantation. Since preferential BAp orientation is an important index for determining bone mechanical function, these findings should be taken into account in future artificial hip-joint designs, especially those involving the stem component.


Keyword:
titanium, biomaterial, total hip arthroplasty, stress-shielding effect, biological apatite (BAp), preferential orientation, bone quality, finite element analysis (FEA)

Received: November 21, 2011
Accepted: December 19, 2011 , Published online: February 25, 2012
Copyright (c) 2012 The Japan Institute of Metals

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