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Instrumented posterior lumbar interbody fusion in adult spondylolisthesis Yu CH; Wang CT; Chen PQClin Orthop Relat Res 2008[Dec]; 466 (12): 3034-43It is unclear whether using artificial cages increases fusion rates compared with use of bone chips alone in posterior lumbar interbody fusion for patients with lumbar spondylolisthesis. We hypothesized artificial cages for posterior lumbar interbody fusion would provide better clinical and radiographic outcomes than bone chips alone. We assumed solid fusion would provide good clinical outcomes. We clinically and radiographically followed 34 patients with spondylolisthesis having posterior lumbar interbody fusion with mixed autogenous and allogeneic bone chips alone and 42 patients having posterior lumbar interbody fusion with implantation of artificial cages packed with morselized bone graft. Patients with the artificial cage had better functional improvement in the Oswestry disability index than those with bone chips alone, whereas pain score, patient satisfaction, and fusion rate were similar in the two groups. Postoperative disc height ratio, slip ratio, and segmental lordosis all decreased at final followup in the patients with bone chips alone but remained unchanged in the artificial cage group. The functional outcome correlated with radiographic fusion status. We conclude artificial cages provide better functional outcomes and radiographic improvement than bone chips alone in posterior lumbar interbody fusion for lumbar spondylolisthesis, although both techniques achieved comparable fusion rates. LEVEL OF EVIDENCE: Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.|*Spinal Fusion/instrumentation[MESH]|Adult[MESH]|Aged[MESH]|Aged, 80 and over[MESH]|Bone Transplantation[MESH]|Female[MESH]|Humans[MESH]|Lumbar Vertebrae/surgery[MESH]|Male[MESH]|Middle Aged[MESH]|Pain Measurement[MESH]|Retrospective Studies[MESH]|Spondylolisthesis/*surgery[MESH]|Treatment Outcome[MESH]|Young Adult[MESH] |
