Fig 1.
The cadaveric model: Creation, confirmation and measurement.
View of the anatomic landmarks to create the cadaver models (A). Video fluoroscopy and myelography allows analyzation of all bony structures and the dural sac (B) as well as the confirmation of AOD model (C) and AOD + AAI model (D). Schematic drawing about the measurements in the upper cervical spine (E) and the placement of the wireless human motion tracker system (F).
Fig 2.
Compression of dural sac measurement.
Myelographic views from fluoroscopy data showed WDS in neutral position (A, measured as baseline), and narrowest WDS during cervical collar application on stable CCJ (B), AOD model (C) and combined model of AOD and AAI (D). Overall changes in WDS at C0/C1 level (E) and C1/C2 level (F).
Fig 3.
The change in angulation from baseline at C0/C1 level (A) and C1/C2 level (B) during cervical collar application.
Fig 4.
Overall motion of cervical spine during cervical collar application in 3-dimention orientation (A). Mean values of flexion (B), rotation (C), and lateral bending (D).
Fig 5.
Comparison between C0/C1 segment and C1/C2 segment.
Changes in WDS (A) and angulation (B) at different levels of the upper cervical spine during cervical collar application.
Table 1.
Data of the comparison between the two upper segments of the cervical spine in all CCJ conditions.