Chris Brown has been accused of badly injuring a 24-year-old girl inside an Orange County nightclub Saturday night after his performance at a concert... and the alleged victim says that she might need surgery.

Deanna Gines tells TMZ she was in the VIP section with Brown at Heat Ultra Lounge in Anaheim, where he had just performed. When the bar was about to close, she claims Chris shoved her to the ground. Deanna tells us, the shove was deliberate and she fell hard on her knees.

Gines has filed a police report and cops are investigating. Here's a photo she posted claiming that she has torn ligaments...

Read more at TMZ