Montgomerie had played 11 holes of his second round when the pain from a prior back injury could not allow him to continue.
The 38-year-old Scot said the injury was a disc concern in his lower back. It first flared in 2000, and forced him off the course during the second round of the English Open last year.
I took a bit of a risk coming down here to Australia, he said. I had the back problem at the Volvo Masters and Williams Challenge and over Christmas. It happened twice and its gone again.
Montgomerie confirmed he had two MRI scans following the Volvo Masters in Spain last November.
He has also been forced to withdraw from next weeks Heineken Classic, and could miss the $5 million WGC-Accenture Match Play Championship in California in late February.
I dont think I will be back for a long time, he said.
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