Chad Reed confirmed in a Instagram post on Sunday that he will miss the remainder of Monster Energy AMA Supercross due to injuries sustained in a crash off the start of the 450 main event on Saturday at round 12 of the championship in Seattle.

Reed made a mistake off the start in the main event and went down and was immediately landed on by Kyle Chisholm, who had already committed to the jump. Reed immediately waved to the Alpinstars Medical Unit for assistance.

In his post, Reed said he sustained eight broken ribs, a broken scapula, and a collapsed lung in the crash.

“Yesterday was fun. Finally a halfway technical track,” he wrote in part. “The whoops were so freaking awesome loved every pass. Unfortunately a mistake in the main was costly 8 broken ribs, broken scapula and a collapsed lung. I’m bummed my year comes to an end with 5 to go."

Reed, who turned 37 earlier this month, had six top tens through 12 rounds, including a podium at the Triple Crown in Detroit, and is eighth in points.