A crash in the opening practice session during St. Louis’ second round of Monster Energy Supercross resulted in a collapsed right lung and partially collapsed left lung for 250SX West contender Cameron McAdoo.

The Monster Energy Pro Circuit Kawasaki rider crashed at the beginning of a rhythm section in free practice. He later returned for the second session, however it called for the end of his campaign in Missouri.

A further medical examination at a local hospital determined the extent of his injuries, which could potentially sideline him for a number of weeks.

“Man, what a tough day,” McAdoo commented. “It’s always a difficult pill to swallow when you end your day early, especially when you’re riding well and feeling good in the beginning. I made a small mistake in qualifying and just couldn’t really recover after that crash.

“I was hurting pretty badly, so the team and I all made the decision to call it a day and get checked out in hopes to recover quicker for the long season ahead.”

McAdoo’s Monster Energy Pro Circuit Kawasaki teammate, Austin Forkner, claimed his first 250SX West victory of the season on Saturday night. McAdoo finished sixth at Anaheim’s opening round, but has now dropped to 14th in the standings.