Doctor explains Ulberg's knee injury suffered during Prochazka fight

Sports physician Brian Sutterer has offered a detailed medical breakdown of the knee injury Carlos Ulberg suffered during his light heavyweight bout against Jiri Prochazka at UFC 327 on April 11, raising concern despite Ulberg walking away with a knockout victory.

According to Sutterer's analysis, Ulberg sustained an anterior cruciate ligament tear during the fight, with the shin visibly displacing forward before the tibia returned to position — a moment captured on camera and accompanied by visible pulsation in the calf. No timeline for surgery or recovery was specified in Sutterer's assessment.

Ulberg, known as "Black Jag," entered the contest ranked third in the light heavyweight division at 35 years old. The New Zealander, who trains out of City Kickboxing, carries a record of 15-1-0 and has been one of the division's most active strikers, landing 6.54 significant strikes per minute at 55 percent accuracy. The win over Prochazka adds a major name to his resume, though the injury now clouds what was otherwise a career-defining performance.

Prochazka, ranked second at light heavyweight, came in at 33 years old representing the Czech Republic with a record of 32-6-1. The hard-charging orthodox fighter is known for his striking output, averaging 5.69 significant strikes per minute with a reach of 80 inches, making every exchange with him inherently dangerous.

Why it matters

• Ulberg earned a significant scalp over a top-two ranked contender, strengthening his title case
• An ACL tear typically requires surgery and months of rehabilitation, which could significantly delay his next appearance
• With both men ranked in the top three at light heavyweight, the divisional picture now hinges on Ulberg's recovery timeline