Police in Chesterfield are appealing for a potential witness to a collision at a roundabout on the A61 involving a car and a motorbike to come forward.
The collision took place at around 1.30pm on Thursday, October 12 at the Whittington Moor roundabout between a black Honda Civic and a yellow Suzuki motorcycle.
The motorcycle rider, a 25-year-old man, was taken to the Northern General Hospital in Sheffield with back injuries.
Officers would like to speak to another motorbike rider who was travelling behind the injured biker and stopped following the collision but left before officers arrived.
The rider, or any other witnesses, should contact PC Colin Buxton on the Roads Policing Unit on 101.