Shoulder-Level Asymmetry Pre- and Post-Posterior Spinal Fusion in Adolescent Patients with Idiopathic Scoliosis

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Abstract
Background: Posterior spinal fusion is the mainstay of treatment for Cobb angle over 50 degrees with satisfactory long-term results. In the surgical management of scoliosis, surgeons usually focus on the amount of coronal curvature correction because it can determine the surgical outcome. Nevertheless, there are many factors that contribute to patients’ satisfaction after surgery, and achieving shoulder balance is one of the most vital factors of a successful surgery. Our objective is to study the differences in managing idiopathic scoliosis with pedicle screws versus hybrid fixation with regard to shoulder imbalance postoperatively. Methods: Continuous variables were described using mean and standard deviation, whereas categorical variables were described using frequencies. The association between predictor independent variables with the analyzed outcomes were expressed as (beta coefficients) with their associated 95% confidence intervals. The Alpha significance level was considered at 0.050 level. Results: The mean angle of the clavicle measured a significant drop post-surgery compared to their pre-surgical measured mean clavicular angle, p-value < 0.001, and so did the coracoid height difference: p-value < 0.001. Furthermore, the participants had measured a significantly lower mean angle of the clavicle compared to their baseline; p-value = 0.029, regardless of their surgery type. The participants mean measured coracoid height difference score had correlated positively with their mean angle of the clavicle: beta coefficient = 1.654, p-value < 0.001; when the coracoid height difference increased, so did the mean angle of the clavicle. Conclusions: Posterior spinal fusion is effective in correcting coronal curvature and improving radiographic shoulder asymmetry in AIS. Significant improvements were observed in Cobb angle, clavicle angle, and coracoid height difference, with pedicle screw constructs providing superior curve correction. These findings reinforce the value of individualized surgical planning that considers coronal, sagittal, and cosmetic alignment goals.

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