Lavin, 33, of Las Vegas, was rushed to University Medical Center after Thursday's accident at the three-day Dew Tour Championship. Video showed Lavin soaring high over a dirt ramp before crashing to the ground.
Lavin was wearing a helmet, tour spokeswoman Nicole Mancuso told CNN.
"T.J. is an important member of the Dew Tour family -- the Tour, athletes and action sports industry are all keeping him in our thoughts and prayers," race officials said in a statement.
Lavin's mother told CNN affiliate KTNV that Lavin broke his eye socket and wrist, and is in a medically-induced coma to reduce swelling on his brain. She said she's confident her son, a veteran of the pro dirt circuit, will pull through.
The competitor remained in critical condition Saturday, hospital spokeswoman Danita Cohen said.
Lavin, the host of MTV's "Real World/Road Rules Challenge" program, has won the gold at several X Games and has produced a music album, according to MTV.
The Dew Tour was established in 2005 and features five events with a combined $2.5 million purse.
Skateboarding and freestyle motocross are featured this weekend, along with the BMX competition.
T.J. Lavin remains in coma
TJ Lavin Suffered Brain Bleeding, Wrist and Eye Fracture after BMX Crash
Watch Tj Lavin Crash – UPDATE
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