Effect of the Pedicle Screw Fixation on the Anterior Lumbar Interbody Fusion Using the Freeze - Dried Structural Allograft / 대한정형외과학회잡지

ABSTRACT

The authors performed a study of 32 patients who had undergone anterior lumbar interbody fusion using allograft with posterior pedicular instrumentation. The clinical outcomes were evaluated and the radiographs were analyzed with respect to graft subsidence, interspace collapse, graft collapse, sagittal angle and fusion status. In 71% of the levels there was a loss of disc space height during the follow-up, with 18% of the levels being narrower than their preoperative height at late follow-up. Significant(more than 3mm) subsidence and collapse were noted in three and four levels respectively. Approximately 84% of the 32 patients had satisfactory results and a radiological fusion was obtained in 88.2% of the 34 levels. We consider the pedicle screw fixation improves the retention of interspace distraction and the fusion rate of allograft in anterior lumbar interbody fusion.