The cervical flexion/extension x ray is one of the most valuable tools in identifying subluxated vertebrae in the cervical spine or neck. In normal flexion the vertebrae should tilt forward and the back portion called the spinous process should fan open. In this example the C6 vertebrae is stuck in extension even when the patient is in full flexion. Upon identifying the subluxated vertebrae a correction can be made and then verified that full restoration of function has been made after a series of adjustments. Chronic neck pain, shoulder pain, muscle spam, numbness and tingling down the arms and headache can be contributed to cervical subluxation.