The Westpac Rescue Helicopter was called to a crash on the Newell Highway on Monday morning.
Two cars collided 50-kilometres south of Narrabri.
A vehicle travelling southbound had four occupants who were all uninjured.
An 18-year-old man travelling northbound suffered serious leg fractures.
He was treated at the scene by Ambulance NSW paramedics and the aircraft medical team.To order photos from this page click here