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Comparisons of outcomes after single or multilevel dynamic stabilization: effects on adjacent segment

STUDY DESIGN: A retrospective study. OBJECTIVES: To compare the clinical/radiologic outcomes and effects on adjacent segments by Dynesys stabilization. SUMMARY OF BACKGROUND DATA: Dynamic stabilization is known to preserve some range of motion (ROM) and to lessen the load on adjacent levels compared with rigid fixation. However, there is concern about the stiffness of Dynesys. In a long-term follow-up study (>4 y), motion of Dynesys was preserved in only 8% of patients and adjacent segment degeneration occurred up to 47% of patients. Little information is available about the risk factor regarding adjacent segment motion. METHODS: Twenty-one patients underwent lumbar spine stabilization with Dynesys owing to degenerative spinal disease (single, 7; multiple-level, 14). Clinical outcomes were evaluated using K-ODI, VAS, and MacNab criteria. Radiologic evaluations included whole spine AP/lateral, lumbar neutral, flexion, and extension x-ray. Follow-up period was 31+/-14 months. Single (group A) and multiple-level stabilization (group B, average 2.3 levels) were compared. RESULTS: Clinical improvement was not different between the 2 groups (P>0.05). Sagittal balance, lumbar lordosis, ROM of the lumbar spine, pelvic tilt, and sacral slope were not changed postoperatively (P>0.05) in either group. Postoperatively, ROM of stabilized segments were significantly decreased from 12.8+/-4.8 degrees to 3.9+/-5 degrees, while ROM of segments above was increased in both groups (P<0.01). Disc height was not decreased in either group (P>0.05). However, retrolisthesis was observed on adjacent segments above in 6 patients only in group B, which may suggests adjacent segment problem. CONCLUSIONS: Clinically, dynamic stabilization is a good alternative treatment option for degenerative spinal disease. However, dynamic stabilization preserves only limited motion and may cause stress on the adjacent level above. Adjacent segment disease may be closely monitored, especially in cases of multiple-levels dynamic stabilization

Keywords : Aged,diagnostic imaging,Female,Humans,Joint Instability,Lordosis,Lumbar Vertebrae,Male,methods,Middle Aged,Motion,Neurosurgery,Orthopedic Procedures,Patients,Radiography,Range of Motion,Articular,Retrospective Studies,Spinal Diseases,Spine,Statistics,Nonparametric,surgery,Treatment Outcome,Universities,, Outcomes,After,Single,Or, cortisone shot london

Date of Publication : 2011 Feb

Authors : Kim CH;Chung CK;Jahng TA;

Organisation : Department of Neurosurgery, Seoul National University Hospital, South Korea

Journal of Publication : J Spinal Disord Tech

Pubmed Link : https://www.ncbi.nlm.nih.gov/pubmed/21270627

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