Acetabulum, Birmingham hip, Birmingham hip resurfacing arthroplasty, Cobalt chrome, cobalt levels, Cobalt poisoning, DePuy, DePuy Orthopaedics, Food & Drug Administration, hip arthroplasty, hip implant, Hip recall, Hip Replacement, hip replacement failure, hip revision, hip surgery, metal components, metal ions, Metal on metal hip, metallosis, MoM Hips, Orthopedic surgery, osteolysis, revision, Smith & Nephew, surgery, Total Hip Replacement
This video from what I understand to be one of the most respected British BHR Hip Replacement Centres is extremely interesting.
From the reading I have done I have drawn the conclusions that the key reasons why the DePuy ASR system failed was:
- 0.05mm gap between the head and the acetabular cup – too fine a tolerance for the synovial fluid to lubricate the artificial hip joint
- shallow acetabular cup leading to more edge wear
- edge wear
However, manufacturing process may have something to do with it – the introduction of heat treatment of the cast cobalt chrome components weakened the metal and appears to lead accelerated osteolysis, tissue and hip breakdown.
For some reason this is not noted in this publication – and if I read it properly, the video below relates to this manufacturer? Click here.
This Scientific Paper is VERY valuable reading – and has me wondering if the problems I face with a Smith & Nephew THR are due to the manufacturing process S&N use in producing their Cobalt Chrome Metal on Metal Hip Replacement components. Click here
Clinical Fallout – Hip Resurfacing
- Veterans are Put through Another War – Hip Recall (earlsview.com)
- Associate Professor Michael J. Neil – Doesn’t Recommend Resurfacing (earlsview.com)
- Mr. Michael Solomon, Sydney Australia Surgeon Gives Advice on Hip Replacement (earlsview.com)
- McMinn Centre Data Suggests How Bad DePuy ASR was v. Others on the Market (earlsview.com)
- How Long Do Hip Replacements Last? (earlsview.com)