Article Figures & Data
Figures
- Figure 1
Single-level dynamic construct and 2-level “hybrid” construct.
- Figure 2
During extension (left) the interpedicular screw distance must decrease, requiring compression of the polycarbonate urethane (PCU) section between the screws. During flexion (right), the interpedicular screw distance must increase, requiring elongation of the device through compression of the opposite PCU section.
- Figure 3
Summary of number of levels treated with dynamic stabilization.
- Figure 4
Summary of number of levels treated with dynamic stabilization.
- Figure 5
Comparison of improvements in ODI after circumferential fusion, posterolateral fusion, and dynamic stabilization in the current study.
- Figure 6
Fifty percent retained ROM. Preoperatively L3-L4: 6.8° ROM. Postoperatively L3-4: 3.4° ROM. Note: red dot indicates center of rotation.
- Figure 7
Thirty-nine-year-old male, 309 pounds. One-year history of lower back and left buttocks discomfort. Single functional spine unit (FSU) involved. Unresponsive to conservative care. Treated with hemi-laminectomy at L4-5 and single-level dynamic stabilization. Axial (A) and saggital (B) T2-weighted MR images showing degeneration of the L4-5 intervertebral disc. Three-month postoperative films of extension (C) and flexion (D) demonstrate motion at the dynamically stabilized level.
Tables
Characteristic Value (%) No. patients 40 Sex Male 15 (38) Female 25 (62) Age, yrs. (range) 55 (21-81) Prior lumbar surgeries 10 Discectomy 5 Fusion 5 Indication No. of Patients (%) Degenerative disc disease 16 (40%) Spondylolisthesis 11 (28%) Fusion-related sequelae 6 (15%) Stenosis 5 (12%) Degenerative scoliosis 2 (5%)
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