Article Figures & Data
Figures
- Fig. 1
The SSCS controls rotation and translation and allows flexion and extension. The screw has 20° of mobility in both the cranial and caudal directions. Segmental Spinal Correction System (A). The hinged screw allows motion (B).
- Fig. 2
Spinous process splitting approach. The advantages of the spinous process splitting laminectomy include minimizing damage to the posterior supporting structure, less dead space and less blood loss, and the prevention of muscular atrophy because nerves and vessels on the paraspinal muscle remain undamaged. Split the spinous process longitudinally in the middle (A). Suture the split spinous process after decompression and insertion of the pedicle screw (B).
- Fig. 3
Case presentation: Preoperative radiograph (A). Postoperative radiograph (B). Postoperative radiograph and computerized tomograph (C). Abbreviations: Post OP, post operation; OP time, operation time; JOA score, Japanese Orthopaedic Association score.
- Fig. 4
Mechanism of SSCS stabilization. The instantaneous axis of rotation (IAR) of flexion and extension is located dorsal to the disc on the superior part of the vertebral body. If there is flexion instability, the disc would have posterior angulation centering on the IAR in flexion, with facet joint sliding. With the SSCS, the rod and the screw head are tightened in neutral position. Therefore facet joint sliding is controlled while still allowing micromotion of the disc because of the hinge between the screw head and the screw thread. It is thought that the micromotion works as a shock absorber, like a car suspension, and prevents adjacent segment disorder.
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