Inspector James Murphy said: “Officers responded to a report that a car had been in collision with a pedestrian on the Ballysillan Road.
“Officers attended the scene along with other members of the emergency services.
“A male pedestrian in his 40s was taken to hospital.
“He sustained severe head and facial injuries which are believed to be life-changing, but not life-threatening at this time.
“A 29 year old female driver was arrested at the scene.
“She is currently in custody, helping us with our enquiries.
“We would appeal for anyone who witnessed the collision or who may have captured footage on dashcam to contact officers on 101 quoting reference number 288 of 22/4/18.”
The Ballysillan Road has now been reopened.