Carlos Ulberg won the UFC light heavyweight title at UFC 327, defeating Jiri Procházka with a first-round knockout despite injuring his knee early.
Ulberg later confirmed he suffered a torn ACL and has since undergone surgery in Las Vegas, leaving his return date uncertain.
The UFC has not announced plans for the belt during Ulberg's recovery, continuing instability in the light heavyweight division after multiple recent title vacancies.
With its fourth champion sidelined, is the UFC's light heavyweight division now irreparably cursed?
A torn ACL and a lost belt: Was Carlos Ulberg's championship night the wildest in UFC history?
How can a fighter generate knockout power moments after suffering a complete ACL tear in the same round?
Could Alex Pereira's heavyweight move make him the greatest combat sports athlete of all time?
Was Jiří Procházka's claim of 'mercy' a valid reason for his knockout loss or just a fighter's excuse?
As the UFC leaves pay-per-view behind, how will its new broadcast deal change the experience for fans?