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  Indian J Med Microbiol
 

Figure 1: Types of occipito-atlanto-axial articulations in AS patients. From Type A, normal C0–C1–C2, to Type C, complete C0–C1–C2 ankylosis

Figure 1: Types of occipito-atlanto-axial articulations in AS patients. From Type A, normal C0–C1–C2, to Type C, complete C0–C1–C2 ankylosis