Broncos safety Rahim Moore underwent emergency surgery Monday for a condition known as lateral compartment syndrome that can cost patients a limb or even their life.
Moore is out indefinitely.
Moore left the Broncos' 27-17 win over the Kansas City Chiefs in the first half Sunday night after being unable to accelerate on Jamaal Charles' 35-yard run. He was replaced by veteran Mike Adams.
The Broncos said he had a lower leg injury and removed him from the game.
During the night, Moore called the team's athletic trainer because he was still experiencing pain and swelling and was told to see a doctor, who determined he needed what's called a fasciotomy.
That's where a surgeon cuts open the skin and fascia covering the affected compartment, which are groupings of muscles, nerves and blood vessels.