With the Lakers down by 18 points in the fourth, the Celtics' Jayson Tatum blew past James and drove to the basket for a layup. Tatum made some minimal contact with James and may have grazed James's chin with his right elbow, but James—ever the league veteran—expertly sold the foul:

Here is what you need to know about James' injury, including how much time he is expected to miss as the regular season winds down.