Thunder general manager Sam Presti said Friday that Robinson first experienced discomfort in the knee after practice on Monday.
Presti says the Thunder's medical team and Robinson decided surgery was the best option "to resolve the issue with certainty." The team says the surgery was successful.
Oklahoma City acquired the 5-foot-9 Robinson on Feb. 24 in a trade with the Boston Celtics. Robinson made his debut for the Thunder on Wednesday, scoring six points in eight minutes.