The McMinn Centre - Excellence in Hips & Knees Hip Resurfacing
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Alternative to Hip Replacement
Welcome to The McMinn Centre, specialising in bone-conserving hip and knee procedures for young & active patients
Research Lectures History
New Materials for Hip Resurfacing
Northern Lights Debate ASR vs BHR
Metal ions and Wear Rates in the BHR
Mini Incision Surgery
Dislocation Rates
Systemic Metal Exposure
What is the BMHR?
Carbides - Myth or Fact
10-Year survival of Double Heat-treated Hip Resurfacings from 1996
Sir Robert Jones Lecture
BOA September 2010
BOA September 2010
The Birmingham Hip Resurfacing and Other Options – The 15 Year Results of the First 1000 BHRs
Design of knee replacement- Can we approach normal knee function? Derek McMinn 2014
 'Metal-on-Polyethyene in Hip Resurfacing' - Derek McMinn, Ghent, May 2014
‘Race for Non MoM Resurfacing - Can we avoid another ASR?’ - Derek McMinn, Ghent May 2014
'Can We Classify Implants By Risk? – Resurfacing' - Derek McMinn, London September 2014
'Movement Patterns of the Knee Relevant to TKR' - Derek McMinn, London Knee Meeting, October 2014
Compromises in Knee Replacement Design - Derek McMinn, London Knee Meeting. October 2014
Hip Resurfacing - Does It Have A Future?
Why are the Functional Results
 of TKR so Poor?
Northern Lights Debate ASR vs BHR
Northern Lights Debate ASR vs BHR
Update on Hip Resurfacing' - Derek McMinn, December 2016
Causes of Failure with Hip Resurfacing
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Systemic Exposure in Large and Small Diameter Metal-Metal Hip Replacements - Hena Ziaee, 2007

In this lecture, Biomedical Scientist Hena Ziaee BSc (Hons) discusses systemic metal exposure in large and small diameter metal-on-metal Total Hip Replacements (THRs).

The Metasul metal on metal bearing was introduced as a small diameter Total Hip Replacement (THR) nearly twenty years ago. The wear rates from these metal-on-metal devices were much lower than the conventional metal on polyethylene Total Hip Replacements.

Modern large diameter metal-on-metal bearings were introduced as Hip Resurfacings. These bearings worked very well and seemed to bridge the gap for young patients with hip disease and the desire for an active lifestyle.

Advantages of the large diameter metal-on-metal Total Hip Replacement include a reduced dislocation rate, low wear rate and an increased range of motion before impingement.

A study was undertaken to test the metal ion levels in large diameter metal-on-metal Total Hip Replacements in comparison to small diameter bearings. Systemic exposure was analysed with whole blood samples and urine measurements taken at twelve months post-op. The samples were analysed by High Resolution Inductively Coupled Plasma Mass Spectrometry (HR-ICPMS).

The difference between the mean whole blood cobalt and chromium levels in the small diameter THRs and the large diameter THRs are not statistically significant. Daily urinary output of cobalt and chromium in both THR groups were also in the same range and without significant mean difference.

© The McMinn Centre - Professor Derek McMinn MD FRCS Hip Resurfacing Birmingham UK