Risk factors for adjacent segment degeneration after PLIF.

摘要: Study design A retrospective study of 87 patients who underwent posterior lumbar interbody fusion (PLIF) at L4-L5 for L4 degenerative spondylolisthesis. Objective To clarify: 1) the correlation between radiologic degeneration cranial adjacent segment and clinical results, 2) risk factors segment, 3) preoperative features additional surgery with degeneration. Summary background data Whereas PLIF pedicle screw fixation has shown satisfactory a solid been reported to accelerate change unfused levels, especially in level. Although several authors have after PLIF, there are no previous reports PLIF. Materials methods Eighty-seven spondylolisthesis could be followed least 2 years were included this study. We measured lordosis, scoliosis, laminar inclination angle L3, facet sagittalization L3-L4, tropism preexisting disc lordosis fused segment. Progression L3-L4 was defined as condition which narrowing, opening, progress slippage comparison dynamic lateral radiographs. Patients divided into three groups according postoperative progression degeneration: Group 1 neither nor neurologic deterioration, but 3 an required deterioration. Correlation results degeneration, investigated. Further, studied detect Results There 58 (67%) classified 1, 25 (29%) 2, 4 (4%) 3. significant difference average age each group. No obvious observed recovery rate Groups 2. Laminar more than those apparent lamina coexisted differences other Conclusion results. Risk not detected terms factor. Coexistence horizontalization L3 may one deterioration resulting from accelerated