Paul George -- Suffers Horrifying Leg Injury (Warning: Extremely Graphic)

You gotta send one up for Paul George -- the NBA superstar suffered a gruesome broken leg during a Team USA scrimmage Friday night in Las Vegas -- and this video of the injury is NOT for the weak of heart.

The Indiana Pacers small forward was attempting to block a James Harden layup, and his right foot landed right against the backboard stanchion -- immediately snapping somewhere above the ankle … it appeared

Coach Mike Krzyzewski called the game out of respect for Paul and his parents … who were in the arena.