A 12-year-boy was hit by a car as he crossed Barton Road, near Wicksteed Park, in Kettering.
Police are appealing for witnesses to the incident which took place at about 3.30pm on Wednesday, April 24.
The boy fell to the ground after being hit, and was taken to Kettering General Hospital for treatment for his injuries.
A police spokesman said: “Officers are particularly interested in speaking with the driver of a black Peugeot who stopped and helped the boy and anyone who saw the incident.”
Witnesses to this incident, or anyone with information about it, can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.