Purpose Choosing an optimal distal fusion level for adult spinal deformity (ASD) is still controversial. To compare the radiographic and clinical outcomes of distal fusion to L5 versus the sacrum in ASD, we conducted a meta-analysis. Methods Relevant studies on long fusion terminating at L5 or the sacrum in ASD were retrieved from the PubMed, Embase, Cochrane, and Google Scholar databases. Then, studies were manually selected for inclusion based on predefined criteria. The meta-analysis was performed by RevMan 5.3. Results Eleven retrospective studies with 1211 patients were included in meta-analysis. No significant difference was found in overall complication rate (95% CI 0.60 to 1.30) and revision rate (95% CI 0.59 to 1.99) between fusion to L5 group (L group) and fusion to the sacrum group (S group). Significant lower rate of pseudarthrosis and implant-related complications (95% CI 0.29 to 0.64) as well as proximal adjacent segment disease (95% CI 0.35 to 0.92) was found in L group. Patients in S group obtained a better correction of lumbar lordosis (95% CI − 7.85 to − 0.38) and less loss of sagittal balance (95% CI − 1.80 to − 0.50). Conclusion Our meta-analysis suggested that long fusion terminating at L5 or the sacrum was similar in scoliosis correction, overall complication rate, revision rate, and improvement in pain and disability. However, fusion to L5 had advantages in lower rate of pseudarthrosis, implant-related complications, and proximal adjacent segment disease, while fusion to the sacrum had advantages in the restoration of lumbar lordosis, maintenance of sagittal balance, and absence of distal adjacent segment disease.
Graphic abstractThese slides can be retrieved under Electronic Supplementary Material.Key points 1. The meta-analysis suggested that fusion to L5 was similar to fusion to the sacrum in the correction of scoliosis, overall complication rate, revision rate and improvements of pain and disability.2. Fusion to the sacrum had advantages in the restoration of lumbar lordosis, maintenance of sagittal balance and absence of distal adjacent segment disease.
Fusion toL5 had advantages in lower rate of pseudarthrosis and implantrelated complications and proximal adjacent segment disease. Jia F, Wang G, Liu X, Li T, Sun J (2019) Comparison of long fusion terminating at L5 versus the sacrum in treating adult spinal deformity: a meta-analysis. Eur Spine J; scoliosis lordosis SVA overall complicaƟons revisions pseudarthrosis and implant-related complicaƟons Jia F, Wang G, Liu X, Li T, Sun J (2019) Comparison of long fusion terminating at L5 versus the sacrum in treating adult spinal deformity: a meta-analysis. Eur Spine J;Take Home Messages 1. There were no significant differences between two groups in overall complication rate and revision rate, which was counter-intuitive. The improvements of pain and disability were also similar in both groups.2. Fusion to the sacrum had advantages in the restoration of lumbar lordosis, maintenance of sagittal balance and absence of distal adjacent segment di...