The Orthopaedic Association has reviewed 18 metal-on-metal hip replacements in the light of fresh concerns about a recalled brand.
Depuy ASR products are no longer in use after being recalled in 2010, because of the possibility of poisoning from the metal.
The association says the models in question were used in 507 of the 35,000 hip operations done over the past five years.
Chief executive Flora Gilkison says surgeons have replaced some of the hips as a precaution and more are likely.
She says all hip replacement models can be tracked and identified through the National Joint Registry.
