Associated factors with height gain in Lenke 3 adolescent idiopathic scoliosis undergoing posterior spinal correction surgery

English Keywords:Adolescent idiopathic scoliosis  Posterior spinal correction surgery  Height gain  Correlated factors

English Abstract:

  【Abstracts】 Objectives: To investigate the factors associated with height gain after posterior spinal correction surgery in Lenke 3 adolescent idiopathic scoliosis(AIS). Methods: A total of 90 Lenke 3 AIS patients undergoing posterior spinal correction surgery from January 2014 to June 2016 was retrospectively reviewed. The average age was 15.0±2.6 years. The pre-op and post-op Cobb angles of structural Cobb angle 1(main curve), Cobb angle 2(second main curve), spinal height(SH), thoracic kyphosis(TK) and lumbar lordosis(LL) were measured on standing whole spine X-rays. The correlations between ΔSH(post-op SH minus pre-op SH) and other parameters were assessed by using Pearson coefficients while the linear regression analysis was used for the predictive model of ΔSH. Results: The average ΔSH was 2.9±1.0cm. The Pearson correlation analysis showed that the ΔSH was significantly correlated with pre-op Cobb angle 1(P=0.000) and Cobb angle 2(P=0.000) of structural main curves and TK(P=0.023). The ΔSH was also significantly correlated with post-op Cobb angle 1(P=0.000), Cobb angle 2(P=0.000), LL(P=0.025), change in Cobb angle 1(P=0.000), change in Cobb angle 2(P=0.000), and change in TK(P=0.032). The linear regression model revealed that change in Cobb angle 1(P=0.017) and change in Cobb angle 2(0.001) were predictive for ΔSH(R2=0.333). The linear regression model also showed that the pre-op Cobb angle 1(P=0.006), Cobb angle 2(P=0.007) and TK(P=0.038) were the correlated factors for ΔSH(R2=0.595). Conclusions: The correlated factors of ΔSH include pre-op and post-op Cobb angles of main curves, pre-op TK, change in TK in Lenke 3 AIS. The correction of main curves is the most important correlated factor for ΔSH. The pre-op Cobb angle and TK are predictive factors for change in height gain in Lenke 3 AIS.