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Published in: BMC Musculoskeletal Disorders 1/2016

Open Access 01-12-2016 | Research article

Finite element analysis of cementless femoral stems based on mid- and long-term radiological evaluation

Authors: Kanehiro Matsuyama, Yasuhiro Ishidou, Yong-Ming Guo, Hironori Kakoi, Takao Setoguchi, Satoshi Nagano, Ichiro Kawamura, Shingo Maeda, Setsuro Komiya

Published in: BMC Musculoskeletal Disorders | Issue 1/2016

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Abstract

Background

Femoral bone remodeling in response to stress shielding induces periprosthetic bone loss. Computerized finite element analysis (FEA) is employed to demonstrate differences in initial stress distribution. However, FEA is often performed without considering the precise sites at which the stem was fixed. We determined whether FEA reflects mid-term radiological examination exactly as predicted following long-term stress shielding.

Methods

Femur–stem fixation sites were evaluated radiologically according to the location of spot welds in two anatomical cementless stem designs. Based on mid-term radiological results, four femur–stem bonding site conditions were defined as: (Condition A) no bonding; (Condition B) bonding within the 10 mm area proximal to the distal border of the porous area; (Condition C) bonding of the entire porous area; and (Condition D) bonding of the entire femoral stem, prior to conducting FEA analysis. Furthermore, we radiographically evaluated mid- and long-term stress shielding, and measured bone mineral density of the femur 10 years after total hip arthroplasty.

Results

Spot welds appeared frequently around the border between the porous and smooth areas. FEA showed that, based on mid-term radiological evaluation, von Mises stress was reduced in condition B in the area proximal to the femur–stem bonding sites for both stem designs compared with condition A (no bonding). Conversely, von Mises stress at all areas of the femur–stem bonding sites in conditions C and D was higher than that in condition A. With respect to stress shielding progression, there was no significant difference between the two types of stem designs. However, stress shielding progressed and was significantly higher in the presence of spot welds (p = 0.001). In both stem designs, bone mineral density in zone VII was significantly lower than that in the contralateral hips.

Conclusions

These results indicate that FEA based on mid-term radiological evaluation may be helpful to predict the influence of long-term stress shielding more precisely.
Appendix
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Metadata
Title
Finite element analysis of cementless femoral stems based on mid- and long-term radiological evaluation
Authors
Kanehiro Matsuyama
Yasuhiro Ishidou
Yong-Ming Guo
Hironori Kakoi
Takao Setoguchi
Satoshi Nagano
Ichiro Kawamura
Shingo Maeda
Setsuro Komiya
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2016
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-016-1260-z

Other articles of this Issue 1/2016

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