Australian Olympic BMX rider Sam Willoughby is in a stable condition in a Californian hospital after undergoing surgery following a training crash.
The 2012 silver-medallist was airlifted to hospital and underwent scans on his back and neck after the incident at the Chula Vista BMX track in San Diego on Saturday (Sunday AEST).
It is believed he landed heavily on his back.
Immediate reports suggested the 25-year-old was conscious and able to move his arms when assessed at the scene.
Willoughby's parents have flown to the US to be by his side, and News Corp Australia reports his mother, Susan, spoke to him over the telephone before the surgery.
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Willoughby, a world champion in 2012, finished sixth in the final at the Rio Olympics.
