Object: Lumbar Fusion is a successful operative possibility to treat lumbar degenerative diseases. The literature describes fusion rates of 90%. This study investigated the rates of lumbar fusion in two different segments in the lower spine.Methods: This retrospective study included patients who were treated by transforaminal lumbar interbody fusion (TLIF) from 2009-2012 in the orthopaedic and trauma surgery at St. Marienkrankenhaus hospital in Ludwigshafen. The fusion rate of 48 Segments and the correlation between fusion und segment were radiographically examined. The clinical outcome was measured from 39 patients by VAS and ODI and was compared with the fusion rate.Results: The fusion rate in L3/4 was 33,3% and in L4/5 15,2%. There was no correlation between fusion and segment. The clinical evaluation showed an average improvement in VAS of 4,5. The ODI showed an average improvement of 31,1%. There was a significant difference between preoperative VAS and ODI to follow-up. The clinical outcome compared to the fusion showed no significant deviation. Conclusion:This study didn't find a difference between the fusion rates in L3/4 or L4/5. The pseudarthrosis rate was very high, but good clinical outcomes could be observed so it seems that stable pseudarthrosis after lumbar fusion is sufficient to reduce pain.
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