Webster, 27, injured his back during a workout at the Wizards' practice facility last week. Dr. Robert Watkins Jr. performed the surgery in Los Angeles after team doctors met earlier in the week to evaluate the injury. Webster will begin rehabilitation immediately, reports USA Today.
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Washington may lose starting small forward Trevor Ariza in free agency, and Webster's presence is important as Otto Porter Jr., drafted third overall in 2013, is groomed to become the starter there. Webster made 13 starts last year but mostly is the team's top wing reserve.
Webster, the sixth overall draft pick in 2005, averaged 9.7 points and 2.8 rebounds in 78 games last season for Washington.