Remove the collar, but tell the patient not to move their head and to tell you to stop at any time. Next palpate along the vertebral column if tenderness is present, stop, put the collar back on and send for films. If no tenderness tell the patient that you are going to move her head for her and tell her to stop if it hurts. Move the patients head slowly in to flexion and then extension, the side to side. If still no pain then you have cleared the C spine