Letters Response

DePuy Orthopaedics replies to Deborah Cohen

BMJ 2012; 344 doi: https://doi.org/10.1136/bmj.e3146 (Published 08 May 2012) Cite this as: BMJ 2012;344:e3146
  1. Graham Isaac, distinguished engineering fellow1,
  2. Simon Sinclair, international clinical director1
  3. On behalf of DePuy Orthopaedics
  1. 1Leeds, UK
  1. GIsaac{at}its.jnj.com

We highlight some of the factual errors and omissions in Deborah Cohen’s article on the safety of metal-on-metal (MoM) hip implants with regard to such hip implants in general and the DePuy ULTAMET implant in particular—one option used with the Pinnacle acetabular cup system.1

All hip implants, irrespective of the materials used, are known to wear. Indeed, concern that debris from the wear of metal-on-polyethylene hip replacements caused bone damage rekindled interest in developing a new generation of MoM implants. Contrary to Cohen’s suggestion, the potential for reactions to debris from the wear of MoM hip implants has been studied for over two decades. In February 2012 the Medicines and Healthcare Products Regulatory Agency (MHRA) said: “The majority of patients implanted with metal-on-metal hip replacements have well functioning hips and are thought to be at a low risk of developing serious problems.”2

Cohen states that DePuy had been aware since 2008 of raised metal …

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