Dr. George Caldwell operates on 20-time PGA Tour winner Dustin Johnson

Golfer Dustin Johnson underwent arthroscopic knee surgery performed by George Caldwell, MD, PGATOUR.com reports.

Three things to know:

1. Dr. Caldwell repaired cartilage damage in Mr. Johson’s left knee on Sept. 5 in Fort Lauderdale, Fla. He previously operated on the golfer’s right knee in December 2011.

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