A patient with thirty years old history of ankylosing spondylitis sustained a head and neck injury after a fall. The patient transmitted to the emergency department and after clinical  examination and x-rays of the head and spine no evidence of fracture occurred. The patient discharged from the emergency department.

Fractures of spine are easily obtained in patients with ankylosing spondylitis due to osteoporosis and altered biomechanics. Cervical spine fractures are usually hapen in C6-C7 vertebra are unstable and frequently have neurological complications. Doctors must be aware of this complication when they examine patients with A.S. even after a minor trauma.