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Blood metal ion concentrations in metal-on-metal total hip arthroplasty

  • Tadahiko OhtsuruEmail author
  • Yuji Morita
  • Yasuaki Murata
  • Shuji Shimamoto
  • Yutaro Munakata
  • Yoshiharu Kato
Original Article • HIP - ARTHROPLASTY

Abstract

Introduction

The hip placement with a metal-on-metal (MOM) bearing has been used for both surface replacement and total hip arthroplasty (THA). Use of MOM bearing for hip replacement reduces the wear compared to conventional bearings.

Methods

We prospectively assessed 30 patients who underwent unilateral MOM THA. A control group of 30 patients who underwent metal-on-polyethylene THA using the implants as the other group, except for bearing, were accessed. Blood samples were collected preoperatively and at 3- , 6- , 9- , 12- , 15- , 18- , and 24-month intervals. Changes in mean blood metal ion concentration were compared between the MOM and metal-on-polyethylene groups.

Results

A statistically significant positive correlation was observed between blood cobalt and chromium concentrations in all of the patients. The mean blood ion concentrations of the MOM were significantly higher than those of the metal-on-polyethylene. A statistically significant negative correlation was found between maximum blood cobalt concentration and cup version angle. The maximum blood chromium concentrations in the patients who had larger cup version angles were more likely to decrease.

Conclusions

We considered that cup version angle is one of the factors that have the greatest effect on blood metal ion concentration, and the target cup version angle that did not induce an increase in blood metal ion concentrations was approximately 20°.

Keywords

Angle Metal Ions Metal-on-metal Total hip arthroplasty Cup version angle 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

The study was approved by the Ethical Committee of Tokyo Women’s Medical University dated October 21, 2008 and approval number 1460. Written informed consent was obtained from all patients involved in the study.

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Copyright information

© Springer-Verlag France 2017

Authors and Affiliations

  • Tadahiko Ohtsuru
    • 1
    Email author
  • Yuji Morita
    • 1
  • Yasuaki Murata
    • 1
  • Shuji Shimamoto
    • 1
  • Yutaro Munakata
    • 1
  • Yoshiharu Kato
    • 2
  1. 1.Department of Orthopedic SurgeryTokyo Women’s Medical UniversityTokyoJapan
  2. 2.Kita Shinagawa 3rd HospitalTokyoJapan

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