Abstract
Study Design/Setting
Matched cohort.
Objective
To evaluate thoracic and thoracolumbar sagittal Cobb angles in patients undergoing either selective thoracic fusion (STF) or nonselective thoracic fusion (NSTF) for Lenke 1C adolescent idiopathic scoliosis (AIS).
Summary of Background Data
The Lenke classification is used to guide fusion levels in AIS. For some curve types, including 1C, there is a disparity in practice regarding whether the thoracolumbar/lumbar curve should be included in the arthrodesis. The impact of performing an NSTF on sagittal parameters has not been adequately evaluated.
Methods
A multicenter database of AIS was queried for patients with right-sided 1C curves treated with posterior correction and fusion. A matched cohort for each group was created based on age, gender, preoperative Cobb angles, and Scoliosis Research Society—22R domain scores. Independent t tests for continuous variables and Fisher exact test for categorical variables were used to compare the STF and NSTF groups.
Results
Thirty-eight patients who underwent NSTF were matched to 38 patients in the STF. An average of 8.0 levels were fused in the STF group and 11.6 in the NSTF group (p <.001). Preoperative and radiographic variables were similar between the two groups.
Postoperatively, there was a statistically significant difference between the STF and NSTF sagittal Cobb in the thoracic spine, 26.9° and 21.7° (p =.013). The greatest difference was in the thoracolumbar sagittal Cobb, which increased to 4.3° kyphosis in the STF group and decreased to 9° of lordosis in the NSTF group (p <.001). Residual thoracolumbar/lumbar scoliosis was 25.5° in the STF group and 14.5° in the NSTF group (p <.001).
Conclusions
STF in 1C curves preserves lumbar motion segments but may be associated with an increase in thoracic and thoracolumbar kyphosis compared to NSTF. As expected, residual thoracolumbar/lumbar scoliosis was less in the NSTF group compared to the STF group.
Although the long-term implications of these changes are unknown, consideration of sagittal balance is critical. Following these patients in the medium and long term will provide important information to guide fusion levels.
Level of Evidence
II.
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References
Glassman SD, Bridwell KH, Dimar JR, et al. The impact of positive sagittal balance in adult spinal deformity. Spine 2005;30: 2024e9.
Glassman SD, Berven S, Bridwell KH, et al. Correlation of radio-graphic parameters and clinical symptoms in adult scoliosis. Spine 2005;30: 682e8.
Lenke LG, Betz RR, Harms J, et al. Adolescent idiopathic scoliosis: a new classification to determine extent of spinal arthrodesis. J Bone Joint Surg Am 2001;83-A:1169e81.
Crawford 3rd CH, Lenke LG, Sucato DJ, et al. Selective thoracic fusion in Lenke 1C curves: prevalence and criteria. Spine (Phila Pa 1976) 2013;38: 1380e5.
Lenke LG, Betz RR, Clements D, et al. Curve prevalence of a new classification of operative adolescent idiopathic scoliosis: does classification correlate with treatment? Spine 2002;27: 604e11.
Newton PO, Faro FD, Lenke LG, et al. Factors involved in the decision to perform a selective versus nonselective fusion of Lenke 1B and 1C (KingeMoe II) curves in adolescent idiopathic scoliosis. Spine 2003;28:S217e23.
Asher M, Min Lai S, Burton D, Manna B. The reliability and concurrent validity of the Scoliosis Research Society-22 patient questionnaire for idiopathic scoliosis. Spine 2003;28: 63e9.
Asher M, Min Lai S, Burton D, Manna B. Discriminationvalidity of the Scoliosis Research Society-22 patient questionnaire: relationship to idiopathic scoliosis curve pattern and curve size. Spine 2003;28: 74e8.
Asher M, Min Lai S, Burton D, Manna B. Scoliosis Research Society-22 patient questionnaire: responsiveness to change associated with surgical treatment. Spine 2003;28: 70e3.
Asher MA, Lai SM, Glattes RC, et al. Refinement of the SRS-22 Health-Related Quality of Life questionnaire Function domain. Spine (Phila Pa 1976) 2006;31: 593e7.
D’Agostino Jr RB. Propensity score methods for bias reduction in the comparison of a treatment to a non-randomized control group. Stat Med 1998;17: 2265e81.
Rosenbaum PR. Model-based direct adjustment. J Am Stat Assn 1987;82: 387e94.
Rosenbaum PR, Rubin DB. The central role of the propensity score in observational studies for causal effects. Biometrika 1983;70: 41e55.
Gu XS, Rosenbaum PR. Comparison of multivariate matching Methods structures, distances, and algorithms. J Comput Graph Stat 1993;2: 405e20.
Rosenbaum PR. Observational studies. 2nd ed. New York, NY: Springer-Verlag; 2002.
Rosenbaum PR, Rubin DB. Constructing a control group using multi-variate matched sampling methods that incorporate the propensity score. Am Stat 1985;39: 33e8.
Schwab FJ, Lafage V, Farcy JP, et al. Predicting outcome and complications in the surgical treatment of adult scoliosis. Spine (Phila Pa 1976) 2008;33: 2243e7.
Cil A, Yazici M, Uzumcugil A, et al. The evolution of sagittal segmental alignment of the spine during childhood. Spine (Phila Pa 1976) 2005;30: 93e100.
Bernstein PB, Hentschel S, Platzek I, et al. Thoracic flat back is a risk factor for lumbar disc degeneration after scoliosis surgery. Spine J 2013;14: 925e32.
Chang KW, Chang KI, Wu CM. Enhanced capacity for spontaneous correction of lumbar curve in the treatment of major thoracic-compensatory C modifier lumbar curve pattern in idiopathic scoliosis. Spine (Phila Pa 1976) 2007;32: 3020e9.
King HA, Moe JH, Bradford DS, et al. The selection of fusion levels in thoracic idiopathic scoliosis. J Bone Joint Surg Am 1983;65: 1302e13.
Larson AN, Fletcher ND, Daniel C, Richards BS. Lumbar curve is stable after selective thoracic fusion for adolescent idiopathic scoli-osis. Spine 2012;37: 833e9.
Lenke LG, Betz RR, Bridwell KH, et al. Spontaneous lumbar curve coronal correction after selective anterior or posterior thoracic fusion in adolescent idiopathic scoliosis. Spine 1999;24: 1663e71; discussion 1672.
Lenke LG, Bridwell KH, Baldus C, et al. Cotrel-Dubousset instrumentation for adolescent idiopathic scoliosis. J Bone Joint Surg Am 1992;74: 1056e67.
Bridwell KH, McAllister JW, Betz RR, et al. Coronal decompensation produced by Cotrel-Dubousset “derotation” maneuver for idio-pathic right thoracic scoliosis. Spine 1991;16: 769e77.
Richards BS. Lumbar curve response in type II idiopathic scoliosis after posterior instrumentation of the thoracic curve. Spine 1992;17(suppl):S282e6.
Richards BS, Birch JG, Herring JA, et al. Frontal plane and sagittal plane balance following Cotrel-Dubousset instrumentation for idio-pathic scoliosis. Spine 1989;14: 733e7.
Thompson JP, Transfeldt EE, Bradford DS, et al. Decompensation after Cotrel-Dubousset instrumentation of idiopathic scoliosis. Spine (Phila Pa 1976) 1990;15: 927e31.
Edwards CC, Lenke LG, Pelle M, et al. Selective thoracic fusion for adolescent idiopathic scoliosis with C modifier lumbar curves: 2-16 year radiographic and clinical results. Spine 2004;29: 536e46.
Suk S-I, Lee S-M, Chung E-R, et al. Selective thoracic fusion with segmental pedicle screw fixation in the treatment of thoracic idio-pathic scoliosis. Spine 2005;30: 1602e9.
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Author disclosures: PCC (none); LYC (none); LGL (none); DJS (receives royalties from AAOS YOC, outside the submitted work); SDG (none).
Institutional Review Board approval for all institutions was obtained before data collection.
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Celestre, P.C., Carreon, L.Y., Lenke, L.G. et al. Sagittal Alignment Two Years After Selective and Nonselective Thoracic Fusion for Lenke 1C Adolescent Idiopathic Scoliosis. Spine Deform 3, 560–565 (2015). https://doi.org/10.1016/j.jspd.2015.05.002
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DOI: https://doi.org/10.1016/j.jspd.2015.05.002