Article Figures & Data
Figures
- Fig. 1
Mobi-C prosthesis. This implant has 5 degrees of freedom.
- Fig. 2
Example of cervical spine stereoradiography using the EOS system in flexion-extension in vivo.
- Fig. 3
Example of reconstructed vertebra (C5) showing the local screw frame based on the 4 barycenters of the 4 anatomic regions (anterior, posterior, left, and right).
- Fig. 4
Example of biplanar radiographs of isolated, dry vertebrae bounded to the reference markers in various positions.
Tables
- Table 1
Standard deviation of reproducibility in measurement of intervertebral displacement with use of EOS system in X-Y′-Z″ mobile sequence of axes for control group (kinematics based on 3D reconstructions of vertebrae)
X Y′ Z″ Extension 2.0° 1.2°* 1.7° Flexion 1.6° 1.5°* 1.6° Right lateral bending 2.6°* 2.6° 3.1° Left lateral bending 2.3°* 3.0° 4.2° Right axial torsion 2.2° 2.5° 3.0°* Left axial torsion 2.7° 2.2° 3.1°* ↵* Main motion.
- Table 2
Standard deviation of reproducibility in measurement of intervertebral displacement with use of EOS system in X-Y′-Z″ mobile sequence of axes for prosthesis group (kinematics based on 3D files of prosthetic endplates)
X Y′ Z″ Extension 1.7° 0.8°* 2.2° Flexion 2.5° 0.7°* 2.2° Right lateral bending 2.0°* 1.9° 1.8° Left lateral bending 1.5°* 2.2° 2.0° Right axial torsion 1.9° 0.5° 1.7°* Left axial torsion 1.5° 0.7° 1.7°* ↵* Main motion.
- Table 3
Mean and standard deviation of range of motion in flexion, extension, right and left lateral bending, and right and left axial torsion
Control Prosthesis P value Extension MP −10.3° (3.4°) −3.1° (4.7°) .001 CP — — CR — — Flexion MP 7.9° (4.6°) 3.1° (7.2°) .023 CP — — CR — — Right lateral bending MP 4.0° (3.8°) 3.2° (4.1°) .477 CP −3.4° (3.6°) −1.0° (2.7°) .008 CR −0.8 (3.1) 0.2 (1.5) .120 Left lateral bending MP −4.3° (3.0°) −2.2° (3.7°) .059 CP 4.2° (3.8°) 1.1° (2.2°) .001 CR −1.3 (3.9) 0.6 (2.0) .013 Right axial torsion MP −4.2° (3.1°) −1.5° (3.2°) .006 CP 3.4° (2.7°) 1.4° (4.7°) .127 CR −5.5 (20.5) −1.9 (4.7) .262 Left axial torsion MP 4.9° (4.4°) 1.6° (2.7°) .001 CP −3.2° (2.5°) −2.2° (3.4°) .299 CR −0.7 (4.5) −0.2 (2.1) .551 Abbreviations: MP, main plane of motion; CP, coupled plane of motion (ie, Y′ for Z″ and Z″ for Y′); CR, coupling ratio.
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