Joel Przybilla – Portland Trail Blazers
In 2009, Joel Przybilla ruptured his Patella tendon in a game against the Mavericks. He came down from a rebound and landed on his knee awkwardly, and that was it. He had surgery days later but after that, he missed the rest of the season and never bounced back fully. He officially retired in 2014.
Trent Green – St. Louis Rams
Back in 1999, Green was set to be the starter for the Rams, but he suffered a gruesome season-ending knee injury during a preseason game, after a hit by Rodney Harrison of the Chargers. He did re-bound the next year and went on to play for the Kansas City Chiefs and Miami Dolphins. He officially retired in 2009 and became a sports analyst with CBS Sports.