Great Ormond Street Hospital in London has launched an urgent review of 721 cases that were treated by a former surgeon.
The hospital has revealed multiple children had come to severe harm under the care of Yaser Jabbar, a consultant orthopaedic surgeon.
UK correspondent Gavin Grey says it's alleged Jabbar conducted inappropriate procedures on these children - causing permanent damage in some.
LISTEN ABOVE

Gavin Grey: UK correspondent on Labour's poor showing at the local elections
03:41

Geoff Bertram: energy economist on the Greens calling for the Government to bring down power prices
05:43

Shane Solly: Harbour Asset Management expert on the market reactions to the 'no deal' announcement on the Middle East conflict
03:07