Kristaps Porzingis won a championship ring with Boston against his former club, Dallas, 4:1 in the series, but will miss up to half a year due to injury.
The Latvian center operated on the medial ligament of the left knee and the dislocated tendon.
Recovery after surgery will take five to six months.
He was injured during the second game of the NBA final series against Dallas (4-1), although he participated in the last two games.
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