Efficacy Comparison of Multiplanar Deformity Reducer System and Direct Vertebral Rotation in Adolescent Idiopathic Scoliosis Corrective Surgery.

Objective: This study aims to evaluate the efficacy of the multiplanar deformity reducer (MDR) and direct vertebral rotation (DVR) techniques in surgically treating adolescent idiopathic scoliosis (AIS), focusing on surgical and radiographic outcomes.

Methods: A retrospective analysis was conducted on AIS patients who underwent surgery between December 2017 and August 2019, comparing the outcomes of those treated with MDR system and DVR technique. Data on demographics and surgical characteristics were collected, while radiographic parameters were measured manually by three spine surgeons and by EOS 3D analysis (EOS imaging, Paris, France).

Results: Nine patients were surgically corrected with the MDR system and 13 with DVR, who were predominantly females with an average age in their late teens. Despite more fusion levels in the MDR group (12.3±1.0) compared to the DVR group (10.0±3.2), operation time, blood loss, overall radiographic correction, and patient-reported outcome was comparable. Moreover, only the interrater reliability for manual apical vertebral rotation measurements was below good, which necessitates the use of EOS 3D analysis.

Conclusion: The MDR technique is effective and safe for AIS surgery, offering comparable corrective efficacy to the DVR technique. Furthermore, EOS 3D imaging was more reliable for assessing rotational deformities, which incorporates pelvic position.