Clinical observation of Dynesys in treatment of 35 cases of lumbar degenerative instability disease

Objective To summarize efficacy of treating lumbar degenerative diseases with Dynesys dynamic stabilization system. Methods From Oct. 2007 to Jan. 2009, 35 cases of low back and leg pain due to lumbar degeneration were treated with Dynesys system. The parameters of ODI score, X-rays and MRI were given pre- and postoperative. Results The mean follow-up period was 38.2 months(2 to 5 years). The ODI score was improved from(56.76 ±9.11)% preoperative to(13.52±10.23)% at 6 months after surgery and(13.41±12.41)% at the final follow-up, there were significant differences in ODI scores between pre- and postoperative(P 0.05). However, there were no significant differences in ODI scores among each time point(P 0.05). L4、5vertebral segments of the activity(ROM) at preoperative, 6 months and 1 year postoperative, and the final follow-up were(13.53±2.19)°,(2.35±1.05)°,(2.36±1.10)° and(2.45±1.13)° respectively, L5S1segment ROM were(10.20±2.24)°,(2.10 ±1.37)°,(2.24 ±1.30)° and(2.52 ±1.59)° respectively. Conclusion Dynesys dynamic stabilization system is placed as a prevention and treatment method for lumbar degenerative diseases, which keep segment of the lumbar spine fix slight activity and has no obvious effect on the adjacent segment disc degeneration and motion.