Abstract
Study design
Retrospective cohort study.
Objectives
To investigate the prevalence and incidence rate of rod fractures (RF) in patients undergoing surgery for correction of adult spinal deformity (ASD) with or without the use of interbody fusions in the caudal levels of the fusion construct.
Background
Data: Pseudarthrosis and rod fracture after long spinal fusion to the sacrum for correction of ASD remain a concern.
Methods
We reviewed clinical records of patients who underwent surgery for correction of ASD between 2004 and 2014. All cases were primary (no prior spine fusion) surgeries with long fusion to the sacrum and bilateral spinopelvic fixation. Patients were dichotomized into one of two groups based on whether an interbody fusion was performed at the caudal levels of the fusion construct. The primary outcome of interest was the prevalence and incidence rate of RFs.
Results
A total of 230 patients underwent a long segment fusion for correction of ASD with mean follow-up of 55 months. 117 patients had an interbody fusion (IF) while 113 patients did not (NIF). At last follow-up, there was no significant difference in the prevalence of RFs between the cohort of patients IF vs NIF (IF cohort: n = 20, 17.9% vs NIF cohort: n = 15, 14.2%, p = 0.49). However, the incidence rate for bilateral rod fractures was 1.6%/year for IF group vs 1.0%/year for NIF group (p = 0.02). Location of RF was different between the two groups; RF (unilateral and bilateral) above L4 was the most common location in the IF group (n = 17/20; 85%) compared to L4–S1 in the NIF group (n = 11/15; 73%) (p = 0.02).
Conclusion
Interbody fusion does not fully protect against rod failure in the lumbar spine in ASD patients with long posterior spinal fusion and may encourage failure at L2–L4, the levels above the interbody fusion.
Level of evidence
III.
Similar content being viewed by others
References
Lertudomphonwanit T, Kelly MP, Bridwell KH, Lenke LG, McAnany SJ, Punyarat P, Bryan TP, Buchowski JM, Zebala LP, Sides BA, Steger-May K, Gupta MC (2018) Rod fracture in adult spinal deformity surgery fused to the sacrum: prevalence, risk factors and impact on health related quality of life in 526 patients. Spine J 18(9):1612–1624
Kim YJ, Bridwell KH, Lenke LG, Rhim S, Cheh G (2006) Pseudarthrosis in long adult spinal deformity instrumentation and fusion to the sacrum: prevalence and risk factor analysis of 144 cases. Spine 31(20):2329–2336
Smith JS, Klineberg E, Lafage V, Shaffrey CI, Schwab F, Lafage R, Hostin R, Mundis GM Jr, Errico TJ, Kim HJ, Protopsaltis TS, Hamilton DK, Scheer JK, Soroceanu A, Kelly MP, Line B, Gupta M, Deviren V, Hart R, Burton DC, Bess S, Ames CP, The International Spine Study Group (2016) Prospective multicenter assessment of perioperative and minimum 2-year postoperative complication rates associated with adult spinal deformity surgery. J Neurosurg Spine 25:1–14
Hamilton DK, Buza JA III, Passias P, Jalai C, Kim HJ, Ailon T, Gupta M, Sciubba C, Jain A, Ames CP, Deviren V, Daniels A, Lafage V, Bess S, Klineberg E, Shaffrey CI, Smith JS, Hart R, The International Spine Study Group (2017) The fate of patients with adult spinal deformity incurring rod fracture after thoracolumbar fusion. World Neurosurg 106:905–911
Tsuchiya K, Bridwell KH, Kuklo TR, Lenke LG, Baldus C (2006) Minimum 5-year analysis of L5–S1 fusion using sacropelvic fixation (bilateral S1 and iliac screws) for spinal deformity. Spine 31(3):303–308
Cho W, Mason JR, Smith JS, Shimer AL, Wilson AS, Shaffrey CI, Shen FH, Novicoff WM, Fu K-MG, Heller JE, Arlet V (2013) Failure of lumbopelvic fixation after long construct fusions in patients with adult spinal deformity: clinical and radiographic risk factors. J Neurosurg Spine 19:445–453
Christensen, Laursen, Gelineck (2001) Interobserver and intraobserver agreement of radiograph interpretation with and without pedicle screw implants the need for a detailed classification system in posterolateral spinal fusion. Spine 26(5):538–544
Godzik J, Hlubek RJ, Newcomb AGUS, Lehrman JN, de Andrada PB, Farber SH, Lenke LG, Kelly BP, Turner JD (2019) Supplemental rods are needed to maximally reduce rod strain across the lumbosacral junction with TLIF but not ALIF in long constructs. Spine J 19(6):1121–1131
Rahman RK, Buchowski JM, Stephens B, Dorward IG, Koester LA, Bridwell KH (2013) Comparison of TLIF with rhBMP-2 versus no TLIF and higher posterolateral rhBMP-2 dose at L5–S1 for long fusions to the sacrum with sacropelvic fixation in primary adult deformity patients. Spine 38(26):2264–2271
Baldus C, Kelly MP, Drake BF, Ahmad A, Mesfin A, Bridwell K (2017) Incidence of cancer in spinal deformity patients receiving high-dose (≥ 40 mg) bone morphogenetic protein (rhBMP-2). Spine (Phila Pa 1976) 42(23):1785–1791
Mesfin A, Buchowski JM, Aronson AB, Bakhsh WR, Fogelson JL, Hershman S, Kim HJ, Zebala LP, Ahmad A, Bridwell KH (2013) High dose BMP-2 in adults: major and minor complications in 502 cases. J Bone Joint Surg Am 95:1546–1553
Funding
No funding was received in support of this study.
Author information
Authors and Affiliations
Contributions
MED: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. KB: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. OA: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. MS: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. JK: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. LGL: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. TL: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. MPK: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. MG: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Corresponding author
Ethics declarations
Ethical approval
IRB approval statement: Institutional review board approval was received for this study.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
El Dafrawy, M., Bridwell, K., Adogwa, O. et al. Rod fractures and nonunions after long fusion to the sacrum for primary presentation adult spinal deformity: a comparison with and without interbody fusion in the distal lumbar spine. Spine Deform 9, 231–237 (2021). https://doi.org/10.1007/s43390-020-00174-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s43390-020-00174-6