Surface-rendered CT reconstructions demonstrate the bony anatomy and anatomical relationship between the atlas and the axis Atlas (A) and axis (B) viewed from above Anterior view of the bony C1/2 complex (C) (Color version of figure is available online.) Axial CT image demonstrates failure of fusion of anterior and posterior arches of C1 Assimilation (complete incorporation) of C1 into the occiput Coronal CT image of os odontoideum Phân loại Cơ chế chấn thương I Gãy mấu xương đơn độc (gãy mỏm ngang khớp) II Gãy cung sau đơn Quá ưỡn độc độ vững Vững, tổn thương lỗ sống/động mạch Vững ... C1/ 2 complex (C) (Color version of figure is available online.) Axial CT image demonstrates failure of fusion of anterior and posterior arches of C1 Assimilation (complete incorporation) of C1