Matthew Merriman1, Calvin Hu2, Katia Noyes3, James Sanders4. 1. School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, NY 14642, USA. Electronic address: matthew_merriman@Urmc.rochester.edu. 2. Department of Orthopedics and Rehabilitation, University of Rochester Medical Center, Rochester, NY 14642, USA. 3. Division of Health Policy and Outcomes Research, University of Rochester Medical Center, Rochester, NY 14642, USA. 4. Department of Orthopedics and Rehabilitation, University of Rochester Medical Center, Rochester, NY 14642, USA; Golisano Children's Hospital, Rochester, NY 14642, USA.
Abstract
STUDY DESIGN: A systematic review of studies reporting pain as a long-term outcome after spinal fusion surgery for treatment of adolescent idiopathic scoliosis. OBJECTIVE: To identify studies that report pain after spinal fusion surgery for scoliosis based on the distal extent of fusion and to combine results to determine if there is an increased incidence of back pain in patients treated with fusion to the lower lumbar spine. SUMMARY OF BACKGROUND DATA: The methods and results of existing studies are inconsistent and only occasionally reach statistical significance. No thorough review of the available information has been published. METHODS: An electronic literature search was performed to identify studies that met predetermined eligibility criteria. Data extracted included number of cases fused to L3 or above, to L4 or L5, and the number of those cases experiencing pain. Further, when possible, the pain variable was stratified into severe or mild categories to allow a more specific subanalysis. RESULTS: Eight studies met inclusion criteria. The meta-analysis for occurrence of pain, the primary outcome, resulted in a final odds ratio of 1.29 (95% CI 0.91-1.82, n = 1,155). When pain was stratified according to severity and only those cases in the severe category considered for meta-analysis, the resulting odds ratio was 1.43 (95% CI 0.72-2.82, n = 900). Neither analysis reached statistical significance. CONCLUSIONS: Although there was a trend toward increased pain in patients whose fusion extended to L4 or L5, there was no statistically significant association between the distal level of fusion and incidence of subsequent back pain, both with and without stratification according to severity of back pain. Because of the limitations of published research, the effect of fusion into the lower lumbar spine on back pain is unknown. Higher quality studies with long-term follow-up and consistent reporting of outcomes are needed.
STUDY DESIGN: A systematic review of studies reporting pain as a long-term outcome after spinal fusion surgery for treatment of adolescent idiopathic scoliosis. OBJECTIVE: To identify studies that report pain after spinal fusion surgery for scoliosis based on the distal extent of fusion and to combine results to determine if there is an increased incidence of back pain in patients treated with fusion to the lower lumbar spine. SUMMARY OF BACKGROUND DATA: The methods and results of existing studies are inconsistent and only occasionally reach statistical significance. No thorough review of the available information has been published. METHODS: An electronic literature search was performed to identify studies that met predetermined eligibility criteria. Data extracted included number of cases fused to L3 or above, to L4 or L5, and the number of those cases experiencing pain. Further, when possible, the pain variable was stratified into severe or mild categories to allow a more specific subanalysis. RESULTS: Eight studies met inclusion criteria. The meta-analysis for occurrence of pain, the primary outcome, resulted in a final odds ratio of 1.29 (95% CI 0.91-1.82, n = 1,155). When pain was stratified according to severity and only those cases in the severe category considered for meta-analysis, the resulting odds ratio was 1.43 (95% CI 0.72-2.82, n = 900). Neither analysis reached statistical significance. CONCLUSIONS: Although there was a trend toward increased pain in patients whose fusion extended to L4 or L5, there was no statistically significant association between the distal level of fusion and incidence of subsequent back pain, both with and without stratification according to severity of back pain. Because of the limitations of published research, the effect of fusion into the lower lumbar spine on back pain is unknown. Higher quality studies with long-term follow-up and consistent reporting of outcomes are needed.