The German collided with a Dutch rider at full speed Tuesday and was hospitalized.

BERLIN (AFP) — Olympic sprint champion Kristina Vogel underwent an operation on her spine Wednesday after a training accident the day before left her seriously injured.

The 27-year-old German, winner of 11 track cycling world titles, collided Tuesday with a male Dutch cyclist at full tilt on the Cottbus velodrome, the German cycling federation told AFP subsidiary SID.

Vogel was airlifted to Berlin for intensive care, according to federation head Patrick Moster.

This is not the first time Vogel has been hospitalized. She spent two days in an induced coma after a 2009 accident left her with severe facial injuries.

Crowned the Olympic team sprint champion in London in 2012, Vogel won the individual title in Rio de Janeiro four years later.

Her world medals include team golds in 2012, 2013, 2014, and 2018, individual golds in 2014, 2015, 2017, and 2018, and keirin golds in 2014, 2016, and 2017.