Application Of PLIF With Pedicle Screw Fixation Combine One Or Two Cubical Cages In Treatment Of Isthmic Spondylo Listhesis

Objective: Posterior lumbar interbody fusion with one cubical cage and two cages were carried of in the treatment of isthmic spondylo listhesis. To explore the feasible and merit and defect of application one cubical cage in PLIF.Methods: Sixty-eight cases of isthmic spondylo listhesis, from Department of Spinal surgery, Hospital Affiliated to Ning Xia Medical University, underwent posterior lunbar interbody fusion with screw system from December 2004 to September 2010 reviewed retrospectively. They were divided into two groups. One group: Thirty cases of isthmic spondylo listhesis underwent posterior lunbar interbody fusion with two cubical cages combined pedical fixation were conducted to all patients. There were17 males and 13 females with an average age 41.3 years old. The other: thirty-eight cases of isthmic spondylo listhesis underwent posterior lunbar interbody fusion with one cubical cage combined pedical fixation were conducted to all patients. There were21 males and 17females with an average age 44.1 years old. Observed the operation time, hemorrhage amount, judged the fusion and fusion time. Observe the changes of symptoms.Results: ALL patients: the mean follow-up time was 12.7months (range: 9-16months). Sixty-two of cases with incompletely neurologieal defect got improved postoperatively: the rate of satisfaction is 91.2%. Solid fusions of bone were observed in 68 cases and no complications such as the loosening and dislocation and breakage of screw. Operation time was shorter and hemorrhage amount was less in fusion with one cubical cage than those in fusion with two cubical cage. There was no difference in the symptom recovery rate and the graft fusion rate between two groups. The bone fusion rate was 100% in two groups.Conclusion: The interbody fusion with one cubical cage produce the same surgical result, while it does decrease the trauma of operation. With one cubical Cage combined pedicle screw system is an ideal internal fixation for the reduction of the spondylolisthesis and thestabilization of the fixation segments.