The doctor was put on restricted duties while the investigation took place.
They were suspended after the review and were "fully co-operating" with the trust's process, Mr Sinker said.
A helpline was made available for parents who were concerned about the treatment their children had received.
The trust has also been contacting the patients and their families to schedule appointments and undergo further clinical assessments where required.
Mr Sinker said: "We take this matter extremely seriously and are committed to ensuring all affected patients and families receive appropriate care and support."
The hospital trust contacted the General Medical Council, NHS England and the Care Quality Commission in light of the review.
"We will identify whether there were any opportunities to have identified these concerns earlier as well as any wider learning and changes required in the immediate and longer term," Mr Sinker added.
He said a further review was planned looking at all the operations undertaken by the surgeon during their employment at the trust.
It is the second NHS hospital performing complex surgery to have reviewed the work of a paediatric surgeon in the past six months.
In September, Great Ormond Street Hospital in central London reviewed the cases of about 700 children after concerns about one of its doctors.