Jayson Tatum, Celtics decided following 'return to play protocol' for left knee stiffness meant missing Game 7 vs. 76ers Tatum was unable to follow the progression from light activity to full practice during a 48-hour period Content Original Link: https://sports.yahoo.com/nba/article/jayson-tatum-celtics-decided-following-return-to-play-protocol-for-left-knee-stiffness-meant-missing-game-7-vs-76ers-185506232.html