Type I: - < 3 mm translation, no angulation; bilateral pars frx, prevertbral soft tissue swelling, w/ normal disc space & normal alignment; C2-3 disk and ligamentous structures remain intact;

May be treated with a cervicothoracic brace (SOMI) which limitis flexion

type I A: minimal translation and little or no angulation; CT demonstrates extension of fracture through the foramen transversum (which may injure the vertebral artery);