Collingwood defender Nathan Brown had surgery yesterday to repair his right patella after injuring it on a hike in Arizona. The surgery was successful.
 
Brown, 22, will undergo a significant rest and rehabilitation period before recommencing training for the 2012 pre-season.
 
The injured knee is on the opposite leg to his recently re-constructed knee, which is healing well.
 
Sports Science Director, David Buttifant told media at Melbourne Airport on Saturday that the injury was the result a fall when he was walking.
 
“It could have easily happened back home at training. He has had a bit of a setback but his ACL (on his previously injured left knee) is coming on extremely well.”

Brown was one of four Magpies who flew to Arizona for Collingwood's mid-year altitude training camp, alongside Dane Swan, Darren Jolly and Brent Macaffer.

The Magpies travel to take on the Sydney Swans at ANZ Stadium on Saturday night.