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Table 2: Comparison of MR imaging findings of nAAA subluxation patients (n = 15) and the control group (n = 20)
MR Imaging Findings nAAA Subluxation (%) Control Group (%) P Value
Dens erosion 47 10 .022
Tilting of anterior atlantoaxial joint 47 10 .022
Peridental effusion 60 0 < .001
    PD 47 0 .001
    RD 27 0 .026
    SD 20 0 NS 
Peridental pannus 53 55 NS 
    PD 33 20 NS 
    RD 40 40 NS 
    SD 27 15 NS 
Facet joint change^a 73 10 < .001
    Joint space widening 53 10 .008
    Bone erosion 47 0 .001
    Joint effusion 40 0 .003
Abnormal spinolaminar line 47 0 .001
Focal myelopathy 33 0 .009
Ligaments 
    Anterior atlantoaxial ligament 13 15 NS 
    Apical ligament 53 30 NS 
    Tectorial membrane 2 1 NS 

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

MR Imaging Findings	nAAA Subluxation (%)	Control Group (%)	P Value
Dens erosion	47	10	.022
Tilting of anterior atlantoaxial joint	47	10	.022
Peridental effusion	60	0	< .001
PD	47	0	.001
RD	27	0	.026
SD	20	0	NS
Peridental pannus	53	55	NS
PD	33	20	NS
RD	40	40	NS
SD	27	15	NS
Facet joint change^a	73	10	< .001
Joint space widening	53	10	.008
Bone erosion	47	0	.001
Joint effusion	40	0	.003
Abnormal spinolaminar line	47	0	.001
Focal myelopathy	33	0	.009
Ligaments
Anterior atlantoaxial ligament	13	15	NS
Apical ligament	53	30	NS
Tectorial membrane	2	1	NS