Porzingis sustained a “torn medial retinaculum allowing dislocation of the posterior tibialis tendon” in Boston’s 105-98 victory against the Dallas Mavericks in Game 2 of the NBA Finals.

Kristaps Porzingis made his long-awaited debut as a member of the Boston Celtics Sunday evening, helping his new club secure a 116-104 preseason victory over the visiting Philadelphia 76ers. The ...