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Table 1: Comparison of MR imaging findings of AAA subluxation patients (n = 40) with abnormal (n = 25) and normal (n = 15) ADI
MR Imaging Findings Abnormal ADI (%) Normal ADI (%) P Value
Dens erosion 64 47 NS
Tilting of anterior atlantoaxial joint 64 47 NS
Peridental effusion 52 60 NS
    PD 44 47 NS
    RD 24 27 NS
    SD 16 20 NS
Peridental pannus 88 53 .024
    PD 80 33 .006
    RD 36 40 NS
    SD 32 27 NS
Facet joint change^a 64 73 NS
    Joint space widening 28 53 NS
    Bone erosion 36 47 NS
    Joint effusion 20 40 NS
Abnormal spinolaminar line 92 47 .002
Focal myelopathy 52 33 NS
Ligaments 
    Anterior atlantoaxial ligament 48 13 .04
    Apical ligament 48 53 NS
    Tectorial membrane 8 2 NS

a Includes joint space widening, bone erosion, or joint effusion.

MR Imaging Findings	Abnormal ADI (%)	Normal ADI (%)	P Value
Dens erosion	64	47	NS
Tilting of anterior atlantoaxial joint	64	47	NS
Peridental effusion	52	60	NS
PD	44	47	NS
RD	24	27	NS
SD	16	20	NS
Peridental pannus	88	53	.024
PD	80	33	.006
RD	36	40	NS
SD	32	27	NS
Facet joint change^a	64	73	NS
Joint space widening	28	53	NS
Bone erosion	36	47	NS
Joint effusion	20	40	NS
Abnormal spinolaminar line	92	47	.002
Focal myelopathy	52	33	NS
Ligaments
Anterior atlantoaxial ligament	48	13	.04
Apical ligament	48	53	NS
Tectorial membrane	8	2	NS