Understand the serious injury Carlos Ulberg suffered in his victory over Jiri Prochazka at UFC 327.

Carlos Ulberg in victory over Jan Blachowicz No. UFC London (Photo: Instagram/UFC)

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Carlos Ulberg He won the light heavyweight title (up to 93 kg) heroically, but the news following the triumph is not encouraging. The New Zealander faced Jiri Prochazka in the main fight of UFC 327, held last Saturday (11), and, even after twisting his knee when attempting a kick, he managed knock off He defeated his opponent with a left cross at the end of the round. Despite the victory, the new champion left the octagon showing signs of a serious injury.

According to sports physician and content creator Brian Sutterer, Ulberg's injury is consistent with an anterior cruciate ligament (ACL) tear. The specialist explained that the forward movement of the tibia at the moment of the twist, followed by the abrupt return of the bone, evidenced by the calf muscle's undulation, is a classic indication of this type of injury.

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"The tibia shifts forward when the ACL is torn, then the calf rippling is when the tibia shifts back," wrote Brian Sutterer.

Tibia shifts forward from ACL being torn, then the calf rippling is when the tibia shifts back https://t.co/mC3KXMS02Q pic.twitter.com/MsfjbZ6peJ

— Brian Sutterer MD (@BrianSuttererMD) April 12, 2026

What is an anterior cruciate ligament (ACL) tear?

Anterior cruciate ligament (ACL) rupture is one of the most frequent orthopedic injuries, especially among athletes. Responsible for stabilizing the knee, the ligament prevents excessive displacement of the tibia relative to the femur and helps control the rotational movements of the joint.

In most cases, the injury occurs without direct contact, being caused by sudden movements, such as abrupt changes of direction with the foot fixed on the ground, rapid decelerations, improper landings after jumps, or even hyperextension of the knee. At the moment of rupture, it is common to hear a popping sound, followed by intense pain, rapid swelling, and a feeling of instability, as if the knee were giving way.

Treatment varies according to the severity and the patient's profile: it can be conservative, with physiotherapy focused on muscle strengthening, or surgical, indicated mainly for athletes, with ligament reconstruction through grafting. Complete recovery, in surgical cases, can take between nine and twelve months.

Watch Ulberg's knockout of Prochazka at UFC 327

ON ONE LEG 🤯@UlbergCarlos is the new light heavyweight champion of the world with a thunderous RD1 knockout! pic.twitter.com/4MvxJ4vx5x

- UFC (@ufc) April 12, 2026

THE KING IS @UlbergCarlos 🏆

He wins the light heavyweight title by KO at #UFC327! pic.twitter.com/SyjazDMeAA

- UFC (@ufc) April 12, 2026

UFC 327 results

MAIN CARD

Light heavyweight (up to 92,9 kg): Carlos Ulberg derrotou Jiri Prochazka by knockout (punch) at 3:45 of round 1 and won the light heavyweight belt.

Light heavyweight (up to 92,9 kg): Paulo borrachinha derrotou Azamat Murzakanov by technical knockout (high kick) at 1:23 of round 3

Heavyweight (up to 120,2 kg): Josh Hokit defeated Curtis blaydes by unanimous decision of the judges (29-28, 29-28, 29-28)

Light heavyweight (up to 92,9 kg): Dominick reyes derrotou Johnny Walker by split decision of the judges (29-28, 28-29, 29-28)

Featherweight (up to 65,7 kg): Cub swanson derrotou nate landwehr by knockout (punch) at 4:05 of round 1

PRELIMINARY CARD

Featherweight (up to 65,7 kg): Aaron Pico defeated Patricio pitbull by unanimous decision of the judges (30-27, 30-27, 29-28)

Welterweight (up to 77,1 kg): Kevin holland derrotou Randy Brown by unanimous decision of the judges (30-27, 30-27, 30-27)

Light weight (up to 70,3 kg): Mateusz gamrot derrotou Esteban Ribovics by submission (katagatame) at 4:18 of round 2

Straw weight (up to 52,1 kg): Tatiana Suarez placeholder image derrotou Loopy Godinez via submission (rear naked choke) at 2min29s of R2

Light weight (up to 70,3 kg): Chris Padilla x MarQuel Mederos It ended in a tie by majority decision of the judges (29-27, 28-28, 28-28).

Average weight (up to 83,9 kg): Vincent Luque derrotou Kelvin Gastelum by submission (triangle choke) at 4:08 of Round 1

Welterweight (up to 77,1 kg): Charles Radtke defeated Francis Meadow by unanimous decision of the judges (30-26, 30-26, 30-26)