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In vivo deformation of anatomically pre-bent rods in thoracic adolescent idiopathic scoliosis

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Title: In vivo deformation of anatomically pre-bent rods in thoracic adolescent idiopathic scoliosis
Authors: Sudo, Hideki Browse this author →KAKEN DB
Tachi, Hiroyuki Browse this author
Kokabu, Terufumi Browse this author
Yamada, Katsuhisa Browse this author
Iwata, Akira Browse this author
Endo, Tsutomu Browse this author
Takahata, Masahiko Browse this author
Abe, Yuichiro Browse this author
Iwasaki, Norimasa Browse this author
Issue Date: 16-Jun-2021
Publisher: Nature Research
Journal Title: Scientific reports
Volume: 11
Start Page: 12622
Publisher DOI: 10.1038/s41598-021-92187-y
Abstract: Some surgical strategies can maintain or restore thoracic kyphosis (TK); however, next-generation surgical schemes for adolescent idiopathic scoliosis (AIS) should consider anatomical corrections. A four-dimensional correction could be actively achieved by curving the rod. Thus, anatomically designed rods have been developed as notch-free, pre-bent rods for easier anatomical reconstruction. This study aimed to compare the initial curve corrections obtained using notch-free rods and manually bent, notched rods for the anatomical reconstruction of thoracic AIS. Two consecutive series of 60 patients who underwent anatomical posterior correction for main thoracic AIS curves were prospectively followed up. After multilevel facetectomy, except for the lowest instrumented segment, either notch-free or notched rods were used. Patient demographic data, radiographic measurements, and sagittal rod angles were analyzed within 1 week after surgery. Patients with notch-free rods had significantly higher postoperative TK than patients with notched rods (P<.001), but both groups achieved three-dimensional spinal corrections and significantly increased postoperative rates of patients with T6-T8 TK apex (P=.006 for notch-free rods and P=.008 for notched rods). The rod deformation angle at the concave side was significantly lower in the notch-free rods than in the notched rods (P<.001). The notch-free, pre-bent rod can maintain its curvature, leading to better correction or maintenance of TK after anatomical spinal correction surgery than the conventional notched rod. These results suggest the potential benefits of anatomically designed notch-free, pre-bent rods over conventional, manually bent rods.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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