The break occurred in May at the Benson and Hedges International Open, but OHern ' unaware of the seriousness of his condition ' played the next five events, culminating at last weeks Irish Open.
He then visited a specialist, and an MRI scan revealed the break, to which he was ordered strict rest.
Unfortunately, that rest will see OHern sit out the British Open, where he was expected to qualify as he ranks inside the top-100.
Its a devastating blow, said OHerns manager Andrew Ramsey.
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