Operations to replace failed implants now made up about 11 per cent of all hip replacements in Britain, and some experts predict this figure could soon rise to 25 per cent. These "revision" operations are more complicated, more expensive and have a poorer success rate than the initial replacements, the Health Which? research found.
More than half the models on the market had been introduced since 1990, but only the oldest and cheapest implants had enough long-term evidence to support their use, it argued. However Health Which? claims the latest models made more money for manufacturers.