California court rules in favor of novice grappler severely injured during jiu-jitsu training session
In a landmark legal ruling, a 30-year-old California man has been awarded over $56 million after a jiu-jitsu training session in 2018 left him permanently paralyzed. Jack Greener, then a beginner white belt, was participating in a sparring session at Del Mar Jiu-Jitsu Club in San Diego when a move executed by his instructor crushed his neck, rendering him a quadriplegic.
The verdict, upheld by the California Supreme Court, underscores growing legal scrutiny around sports training safety and the responsibility of instructors to minimize risks that go beyond the inherent dangers of contact sports.
Devastating injury during routine sparring session
According to court documents and a report by the New York Post, Greener was paired with black belt instructor Francisco “Sinistro” Iturralde during a training session at the club. At one point, Iturralde executed a maneuver that applied his full body weight onto Greener’s neck. The force of the move crushed his cervical vertebrae, causing immediate paralysis.
“The black belt instructor did a technique that placed his entire body weight on Greener’s neck, causing him to instantly fall limp and lose all function of his limbs,” said Brazilian jiu-jitsu expert Rener Gracie, who testified in the case.
The injury occurred just weeks before Greener was set to graduate from college. He was hospitalized for several months, underwent multiple surgeries, and suffered strokes as a result of the spinal trauma, his attorneys said.
Legal victory and call for accountability
Greener initially received a $46 million judgment in 2023, but the amount increased due to post-judgment interest. The ruling was ultimately upheld by the state’s highest court, which emphasized that instructors can be held liable when their actions create avoidable and excessive risks in training environments.
He filed suit against Del Mar Jiu-Jitsu Club and Iturralde, whose aggressive and high-impact grappling style has earned him the nickname ”“Sinistro”, Portuguese for “Sinister”, as noted on websites that market his instructional content.
From paralysis to purpose
Despite the catastrophic injury, Greener has since redefined his life as a motivational speaker and mountain climber. He now advocates for stronger safety standards and accountability in athletic training, particularly within high-risk sports like martial arts.
His case has drawn national attention, sparking discussions about the duty of care that coaches and instructors owe to students, especially beginners, in physically demanding disciplines.
