More than 2,200 letters have been sent to parents of children who had dysplasia of the hip surgery offering routine follow-up appointments.
Children's Health Ireland (CHI) has sent 1,757 letters to parents of children who had the surgery at Temple Street and Crumlin, with 503 letters also issued by National Cappagh Orthopaedic Hospital (NOHC).
An early recommendation from the audit, which has yet to be completed and published, was for letters to be sent to parents offering routine follow up appointments.
These appointments are being arranged over the coming months.
CHI and NOHC said in a joint statement that they wrote to parents of all children who had the surgery "in line with good clinical practice" to advise them that a clinical audit is ongoing.
They said the group of patients "will continue to be monitored to skeletal maturity (until their bones are fully grown)".
"The letter clarified that the hospitals are ensuring that all patients are in a follow-up process to skeletal maturity, in line with best international practice and as an early recommendation of the audit," the hospitals said.
"CHI and NOHC will communicate further with families when the clinical audit is complete and any required additional steps will be taken as part of an Action Plan," they added.
"We recognise the concerns of our patients families and are committed to expediting the audit process, publishing the findings and implementing any required actions.
"When the audit is complete, we will prioritise open and transparent communication with our patient families."
Minister for Health Jennifer Carroll MacNeill said in a statement that she is "very conscious of the concern that will be felt by all patients and families affected".
"The audit process is nearing completion and the Minister has been advised that it will be finalised and completed imminently," she added.
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Meanwhile, the Taoiseach said the Government hopes to receive the clinical review of hip surgeries on children at two Dublin hospitals by the end of next week.
Micheál Martin was responding to the Social Democrats deputy leader Cian O'Callaghan who claimed the Government was entirely ignorant about how many children may be affected.
The Taoiseach has been asked in recent days to clarify if all families and parents potentially affected by the Children's Health Ireland (CHI) hip surgery controversy have been contacted about the concerns.
Mr O'Callaghan accused the Coalition of "trying to maintain plausible deniability about the crisis" by refusing to answer questions.
Mr Martin described the issue as very serious and he said the Government has no objective in hiding anything.
"The least we owe to the parents and the families are the facts," he said.
Mr Martin said that letters already issued to families are general in nature and they were sent in response to an "alleged draft report" of the clinical audit which was published earlier this year.
He repeatedly said that the number of letters issued is not the key point, but he added that Ms MacNeill has asked CHI to publish the number today.
"It is horrendous if anything wrong was done but we need to find out the full facts," he said.
The CHI-commissioned independent review into hip surgeries in children, announced in July last year, is looking at a random, anonymised sample of dysplasia of the hip surgeries, between 2021 and 2023, at Children's Health Ireland hospital sites, as well as Cappagh Orthopaedic Hospital.
This type of surgery is where the ball and socket joint of a child's hip has not properly formed.
Aontú leader Peadar Tóibín said there is a "excruciating lack of information for parents" over dysplasia of the hip surgeries in children, and that the Government is "adding to the confusion".
Speaking on RTÉ's Today with Claire Byrne that it was "incredible" that the Taoiseach stated during Leaders Questions in the Dáil yesterday that the audit will not go back 15 years.
"The letter that parents are receiving I understand is saying that children are being called back for routine appointments.
"However the Taoiseach has stated that the Department is identifying patients who may be affected but are not included in the audit.
"Then we see reports in the media saying the appointment letters are because of an early recommendation in the unpublished review."
"Clearly those three sentences cannot be true at the same time so the Government is giving out confusing messages in terms of what parents are being contacted."
Read more: CHI letter amid hip surgery review a 'kick in the teeth', says mother
He added that if there is wrongdoing from previous years, it needed to be investigated.
"Are the Government looking to do an audit for two years and then draw a veil over the practice previously?
"Parents have a right to know what happened to their children a number of years ago, and citizens have a right to know why there is dysfunction in our health service," he said.
The review has been examining whether the criteria used for surgical intervention varied between three hospitals and if surgery was required in all cases.
Children who have had developmental dysplasia of the hip (DDH) surgeries at the hospitals are to be offered "routine follow-up care" in the coming months if a child is not already in a long-term follow-up process with one of the hospitals, according to letters sent to parents recently by CHI.
It follows an early recommendation from the independent review, that is yet to be completed, into dysplasia of the hip operations at Crumlin, Temple Street and the National Orthopaedic Hospital Cappagh.
The letters sent by CHI say that the follow-up appointment is part of the "normal post-operative review process and is not urgent".
The letter states that the DDH review is not complete, and the hospital cannot provide any detail of its findings, nor can it comment on any media reports as to what it might ultimately say.
"However, an early recommendation.. is that all children who have had DDH surgery should receive routine follow-up care until the child's bones have fully grown and developed (skeletal maturity) in line with current best practice," the letter from CHI states.
The Sinn Féin Leader has accused the Taoiseach of misleading the Dáil when he said that letters sent to parents whose children had hip surgery were in response to the publication in the media of a draft clinical audit.
Mary Lou McDonald said it is clear that the letters were not routine and they were instead the result of an early recommendation from those carrying out the audit.
She said this is actually stated in the letters.
