Postlaminectomy problems with reference to spinal fusion.

Absence of relief of sciatica after laminectomy is not an indication for fusion. Significant remaining low back pain with a distinct morphologic explanation sometimes may be considered an indication for fusion. Recurrent sciatica due to fibrosis is not relieved by fusion. Induced instability because of facetectomy responds well to fusion. Fusion for unspecific remaining complaints after decompressive surgery, not explained by distinct morphologic findings, should be avoided.