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Aims:The strong fixation and dynamic fixation were studied contrastly to investigate the clinical effect of the dynamic fixation to prevent lumber adjacent segment degeneration(ASD).Material and methods:We selected degenerative lumber illness,such as lumber degenerative destablization,lumber degenerative spondylolisthesis and lumber stenosis for prospectively study from April,2001 to February,2006.The selected criteria was that lumber degenerative diseases which had been ineffectively treated with nonoperative methods more than 6 months.The exclusion criteria were that patients had lumber operation history,reactive infection and congenital deformities.There were 75 patients(Male 41,Female 34) to be selected.All the cases were divided into strong fixation group(A) with 45 cases and dynamic fixation(B) with 30 cases.The average age of Group A was 56±6ys,and the latter was 57±9ys.All the cases were taken radiograph in standing position,computerized tomography(CT) or magnetic resonance imaging(MRI).The observation index included incidence rate of ASD,breakage of fixation device,fusion rate,lumbopelvic parameters and VAS scores.