A Cochrane review [Abstract] 1 included 2 studies with a total of 88 subjects. Both tested decompression surgery plus oral corticosteroids versus oral corticosteroids alone. The interventions and outcomes were too heterogeneous to be combined in a meta-analysis. After two years follow-up there was no significant difference in nerve function improvement between people treated with surgery plus prednisolone or with prednisolone alone. Adverse effects of decompressive surgery were not adequately described.
Comment: The quality of evidence is downgraded by imprecise results (few patients and wide confidence intervals), by inconsistency (heterogeneity in interventions and outcomes), and by study quality (more than 20% loss to follow up).
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