The former mixed martial arts superstar's middle finger was broken and her tendon was nearly severed, while she also fractured the tip of her ring finger during an on-set door-slamming accident in Mexico.
According to TMZ, she was taken by ambulance to a San Diego-area hospital for treatment, where her middle finger had to be repaired with a bolt and screws.
Ronda has posted a gruesome photo of her gnarly injury online.
The actress, who plays a tough Los Angeles firefighter on the show, stayed in character and finished the scene, before she alerted the director to her mangled fingers. According to reports, she was back at work the next day.