Surgical management of penetrating spinal cord injury primarily due to shrapnel and its effect on neurological outcome: a literature review and meta-analysis.

OBJECTIVE This study was performed to determine whether decompression of penetrating spinal cord injury (SCI) due to explosive shrapnel leads to greater neurological recovery than conservative management. METHODS In accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a comprehensive literature search using PubMed/MEDLINE, Web of Science, Google Scholar, and the Defense Technical Information Center public site was conducted on May 2, 2016. Studies that described penetrating SCI with shrapnel as an etiology, included surgical and/or conservative management, and demonstrated admission and follow-up neurological status were eligible for inclusion in this study. Odds ratios were calculated for the overall effect of surgical treatment on neurological recovery. Funnel plots were used to evaluate publication bias. RESULTS Five case series (Level IV evidence) met the study criteria, and 2 of them had estimable odds ratios for use in the Forest plot analysis. Among the patients from all 5 studies, 65% were injured by shrapnel, 25% by high-velocity bullet, 8% by low-velocity bullet, and 2% by an unknown cause. A total of 288 patients were included in the overall odds ratio calculations. Patients were stratified by complete and incomplete SCI. The meta-analysis showed no significant difference in outcomes between surgical and conservative management in the complete SCI cohort or the incomplete SCI cohort. Overall rates of improvement for complete SCI were 25% with surgery and 27% with conservative treatment (OR 1.07, 95% CI 0.44-2.61, p = 0.88); for incomplete SCI, 70% with surgery and 81% with conservative treatment (OR 1.67, 95% CI 0.68-4.05, p = 0.26). CONCLUSIONS This study demonstrates no clear benefit to surgical decompression of penetrating SCI due predominantly to shrapnel. There is a considerable need for nonrandomized prospective cohort studies examining decompression and stabilization surgery for secondary and tertiary blast injuries.