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 changea | 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.