Hoy's crash in photos

Everything is going to plan for Sir Chris Hoy during the keirin final at the Ballerup Super Arena in Copenhagen

Everything seems to be going to plan for Sir Chris Hoy during the men's keirin final at the Ballerup Super Arena in Copenhagen

But then the 32-year-old Briton, vying for a second gold medal, brushed against Kevin Sireau and he started to wobble

But then the Briton, vying for a second gold medal at the World Cup meeting, brushes against Kevin Sireau and starts to wobble

The wobble becomes more serious and Hoy heads to earth

The wobble quickly becomes more serious and Hoy heads to earth

The Scot is flung this way and that, bringing down a rival in the process

He is flung this way and that, bringing down a rival in the process

The three-time Olympic champion receives prompt treatment at the track

The three-time Olympic champion receives prompt treatment

But he eventually gets to his feet, albeit a little gingerly

But the 32-year-old eventually gets to his feet, albeit a little gingerly

Hoy waves to the crowd before leaving the arena

The injured Scot waves to the crowd before leaving the arena

BBC Sportcycling