Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (4): 609-614.doi: 10.3969/j.issn.1673-8225.2010.04.009

Previous Articles     Next Articles

Application of Wallis dynamic stabilization system in surgical treatment of lumbar segmental instability: Effect evaluation

Liang Chun-xiang, Chen Ke-bing, Liu Shao-yu, Han Guo-wei, Long Hou-qing, Wei Fu-xin, Huang Yang-liang   

  1. Department of Spinal Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou  510700, Guangdong Province, China
  • Online:2010-01-22 Published:2010-01-22
  • Contact: Liu Shao-yu, Department of Spinal Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510700, Guangdong Province, China
  • About author:Liang Chun-xiang, Associate chief physician, Department of Spinal Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510700, Guangdong Province, China gzsyliu@tom.com

PDF

881

Abstract:

BACKGROUND: Posterior lumbar non-fusion devices have been developed to control vertebral column movement, change load pattern of instability segment, restrict abnormal action, as well as avoid adjacent segment degeneration.
OBJECTIVE: To investigate the efficiency of Wallis dynamic stabilization system in the treatment of lumbar vertebrae instability. 
METHODS: Ten cases suffering from lumbar instability were selected, including 3 males and 7 females, aged 43-65 years. One patient sustained L 1/2 and L 4/5 segmental instability, one was L 2/3 and another was L 3/4, and the others were L 4/5. Two patients complicated with lumbar disc herniation and 7 patients combined with lumbar spinal stenosis at the same affected segment, and 3 patients associated with lumbar spinal stenosis at adjacent segment. All unstable segments were treated with decompression, posterior implantation of Wallis dynamic stabilization system. Visual analogue scale (VAS) and Japanese Orthopedic Association (JOA) scores for low back pain and Oswestry disability index (ODI) were used to evaluate clinical outcomes. In addition, the range of motion (ROM) at the instrumented segment and adjacent segments and posterior disc height (PDH) in standing and extension position at L 4/5 segment were also measured.
RESULTS AND CONCLUSION: All the patients were followed-up for 2-13 months, mean 9.2 months. The mean operation duration was 128 minutes (90-185 minutes), with bleeding volume of 264 mL (50-600 mL). Sings and symptoms of all patients were improved significantly after operation, except one patient with recurrence of L 4/5 lumbar spinal stenosis at 3 month after surgery, whose symptoms relieved by revision with fenestration and decompression. The postoperative VAS was dramatically decreased than that of preoperation (P=0.003); the JOA score was obviously increased (P=0.002), and the ODI score was decreased (P=0.008). The postoperative range of motion decreased significantly (P < 0.05). However, there was no obviously difference between preoperative and postoperative L 3/4, L5/S1 and posterior disc height (P > 0.05). Good clinical results can be achieved by surgical intervention with Wallis dynamic stabilization system in treating lumbar vertebrae instability.

CLC Number: