Article Figures & Data
Figures
- Fig 1.
Midsagittal T2-weighted MR image in a 64-year-old woman with rheumatoid arthritis. The image shows that the posterior cortex of the anterior tubercle of C1 and the anterior cortex of the odontoid process are not parallel. Also note the abnormal spinolaminar line (arrow).
- Fig 2.
Midsagittal T2-weighted MR image in a 72-year-old man with spondylosis. The image depicts focal high signal intensity at the cervical spinal cord (arrowhead). Note minimal fluid accumulation in the supradental region.
- Fig 3.
Midsagittal T2-weighted MR image in a 69-year-old woman with rheumatoid arthritis. The image shows peridental fluid, pannus proliferation (arrow), and nonvisualization of the apical ligament. The atlantodental interval measured 7 mm on flexion radiograph (not shown).
- Fig 4.
Normal apical ligament (arrow) and normal anterior atlantoaxial ligament (arrowhead) in the diagram (A) and the midsagittal T2-weighted MR image (B) in a 45-year-old woman with rheumatoid arthritis. Note the widened atlantodental interval (4 mm).
- Fig 5.
Paramedian sagittal T1-weighted MR image in a 65-year-old woman with spondylosis. The image shows erosion of the lateral facet joint and bone marrow edema (white arrow).
Tables
- 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 changea 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.
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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 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.
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