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Chehrassan M, Nikouei F, Shakeri M, Azarnia G, Moeini J, Abiri F et al . Cervical Range of Motion Following Scheuermann Kyphosis Corrective Surgery. JROS 2025; 12 (2) :83-90
URL: http://jros.iums.ac.ir/article-1-2296-en.html

Background: Surgical correction of Scheuermann’s kyphosis is an effective treatment for severe deformities; however, its impact on cervical range of motion (ROM) remains underexplored, particularly in certain populations.
Objectives: This study aimed to evaluate the changes in cervical ROM following surgical correction of Scheuermann’s kyphosis and to identify factors influencing postoperative outcomes.
Methods: A total of 32 patients with Scheuermann’s kyphosis who underwent posterior spinal correction and fusion from July 2021 to October 2023 were included in this prospective study. Cervical ROM (flexion, extension, lateral bending, and rotation) was measured preoperatively and at 2-month, 6-month, and 1-year follow-ups using a standardized goniometer-based method. Demographic parameters, radiological measures, instrumentation details, and kyphosis apex levels were recorded. Statistical analysis was performed to assess correlations between cervical ROM reductions and surgical factors, including the upper instrumented vertebra (UIV), lower instrumented vertebra (LIV), and preoperative curve flexibility.
Results: Cervical ROM decreased significantly across all planes of motion one year postoperatively. Flexion and extension showed the highest reductions (20.33% and 19.84%, respectively), while right and left rotation exhibited the least changes (11.59% and 13.21%, respectively). Greater preoperative kyphosis severity and lower curve flexibility were associated with more significant ROM reductions, particularly in flexion and extension (P<0.05). Patients with UIV at T3 or T4 experienced greater reductions in flexion, right bending, and right rotation, while those with LIV at L4 had the most significant extension reduction (P=0.002). The type of instrumentation (screw vs. hook) at UIV did not significantly affect ROM outcomes.
Conclusion: Surgical correction of Scheuermann’s kyphosis results in a significant reduction in cervical ROM, particularly in flexion and extension. Preoperative kyphosis severity, curve flexibility, and instrumentation levels are key factors influencing these outcomes. These findings underscore the importance of individualized surgical planning and postoperative rehabilitation to mitigate cervical mobility loss and optimize patient function.