Article Figures & Data
Figures
- Fig. 1
A-P radiograph showing expandable corpectomy cage with rectangular endcaps spanning the ring apophysis.
- Fig. 2
Experimental test setup showing T11-L3 intact spine mounted on multiaxial spine test system. Infrared LED marker arrays attached at T12 and L2.
- Fig. 3
Lateral fluoroscopic images showing test conditions: (A) intact, (B) sub-total corpectomy, (C) expandable cage with round endcaps, (D) round endcaps with lateral plate, (E) round endcaps with bilateral pedicle screws, (F) expandable cage with rectangular endcaps, (G) rectangular endcaps with lateral plate, and (H) rectangular endcaps with bilateral pedicle screws. Intact spine shows implantation of bilateral pedicle screws and lateral plate bolts prior to testing.
- Fig. 4
Mean T12-L2 range of motion for all test conditions in: (A) flexion-extension, (B) lateral bending and (C) axial rotation. Error bars represent ± 1 standard deviations. ROM denotes range of motion, Round – expandable cage with round endcaps, Rect. – expandable cage with rectangular endcaps, Ant. Plate – anterior plate, Bilat. PS – bilateral pedicle screws.
Tables
Testing Conditions Flexion-Extension Lateral Bending Axial Rotation Intact vs. Corpectomy < 0.001 < 0.001 < 0.001 Round 0.639 < 0.001 < 0.001 Round + Ant. Plate 0.002 < 0.001 0.992 Round + Bilat. PS < 0.001 < 0.001 0.643 Rect. 0.589 0.999 < 0.001 Rect. + Ant. Plate < 0.001 < 0.001 0.980 Rect. + Bilat. PS < 0.001 < 0.001 0.867 Corpectomy vs. Round < 0.001 < 0.001 < 0.001 Round + Ant. Plate < 0.001 < 0.001 < 0.001 Round + Bilat. PS < 0.001 < 0.001 < 0.001 Rect. < 0.001 < 0.001 < 0.001 Rect. + Ant. Plate < 0.001 < 0.001 < 0.001 Rect. + Bilat. PS < 0.001 < 0.001 < 0.001 Round vs. Round + Ant. Plate 0.054 < 0.001 < 0.001 Round + Bilat. PS < 0.001 < 0.001 < 0.001 Rect. 0.924 < 0.001 0.026 Rect. + Ant. Plate 0.020 < 0.001 < 0.001 Rect. + Bilat. PS < 0.001 < 0.001 < 0.001 Round + Ant. Plate vs. Round + Bilat. PS 0.526 1.000 0.751 Rect. 0.121 < 0.001 < 0.001 Rect. + Ant. Plate 0.967 1.000 0.939 Rect. + Bilat. PS 0.497 1.000 0.900 Round + Bilat. PS vs. Rect. 0.001 < 0.001 0.018 Rect. + Ant. Plate 0.687 0.986 0.739 Rect. + Bilat. PS 0.987 0.998 0.975 Rect. vs. Rect. + Ant. Plate 0.050 < 0.001 < 0.001 Rect. + Bilat. PS 0.001 < 0.001 0.004 Rect. + Ant. Plate vs. Rect. + Bilat. PS 0.632 1.000 0.910 Round denotes expandable cage with round endcaps, Rect. – expandable cage with rectangular endcaps, Ant. Plate – anterior plate, Bilat. PS – bilateral pedicle screws
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