Lucas Neville was called on as a substitute for the second team at St Michael's College on Ailesbury Road at the time he suffered the injuries in November 2009.
He had been hurt by a knee to the head in rugby training 18 days earlier.
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The 22 year old of Pembroke Lawn, Ballsbridge, sued the school and St Vincent's Healthcare Group for alleged negligence.
Liability was admitted but there was a hearing over damages.
His mother told the court today that 'nobody has ever apologised' to the family for what happened.