Metal on metal hip resurfacing is considered to be a much better option because it has a lower failure rate and is more cost effective since it does not need to be repeated as often as a total hip replacement.

BBC: NHS arthritis treatment for young

The company believed the product was performing well until August 2010 when it "received new information from the National Joint Registry of England and Wales reporting that 12% of ASR resurfacing patients and 13% of ASR Total Hip Replacement patients were undergoing second hip replacement surgery sooner than expected".

BBC: Andrew Robathan