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Obese patients undergoing lumbar fusion achieve similar benefits to nonobese patients. Wound-related complications are more common in obese patients. Obese patients with otherwise good indications for lumbar fusion should not be denied this procedure because of their weight.

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The CT scan reading of either one or both posterolateral gutters fused or both facets fused were moderately predictive of a solid fusion on surgical exploration. Fine-cut CT scans with reconstructions are moderately predictive of the presence of nonunion when both facets are not fused.

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