UK firm sold spinal implants that disintegrated

Plastic discs that also moved in some patients were only tested on 30 people in six months

A UK company's spinal implants that allegedly moved and eroded in patients, and which are at the centre of legal action, have highlighted potential weaknesses in the way in which some medical devices enter the market, an investigation has revealed.

Documents seen by the Guardian show the plastic discs were approved for sale by the British Standards Institution (BSI) after tests on 30 people over six months