Comparative Study On Single Threaded Fusion Cage And Posterior Intervertebral Bone Grafting Fusion Combined With Pedicle Screw Fixation For Lumbar Spondylolisthesis

Objective:To compare the therapeutic effectiveness of lumbar spondylolisthesis treated by single threaded fusion cage and posterior intervertebral bone grafting fusion combined with pedicle screw fixation.Methods:From January 1999 to December 2003, 77 patients with lumbar spondylolisthesis were retrospected.Among them,there were isthmic spondylolisthesis(37 cases),lumbar degenerative spondylolisthesis(35 cases), lumbar traumatic spondylolisthesis(2 cases), post-laminectomy lumbar spondylolisthesis(3 cases).All the patients were divided into two groups—group A,group B.Twenty-six patients in group A were treated with PLIF using threaded fusion cage(TFC) with transpedicular screw-rod fixation.Fifty-one patients were treated with pedicle screw-rod fixation combined with posterior approach intervertebral bone grafting,The slippage rate,reduction rate, intervertebral height,JOA score,fusion rate of bone grafting and complications were observed respectively and compared between the two groups.Results:The follow-up period of each case was more than one year and 10 months,with an average of 33 months.Based on the criteria of JOA score,the recovery rate was 53.8% on an average in group A,78.4% in group B.There was statistically a significant difference of recovery rate between group A and group...