That's brutal. I found this online:
"Amateur strongman Todd Seiple also suffered a sickening injury at the hands of the atlas stones while competing in the 2005 North American Strongman nationals.
While lifting the penultimate 365kg rock, both of his knees gave way and he collapsed sickeningly to the floor.
Describing his injuries in the video’s description, Seiple wrote: “Damage from stone load caused ruptured patella tendons in BOTH right and left knees, torn left ACL and MCL ligaments, left quad and adductor torn from the bone.”