Related Experiment Video
Updated: Apr 27, 2026
Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
Published on: November 8, 2024
Clinical outcomes of spinal osteotomy with preservation of the "hinge structure" for severe deformities: A
Ying Zhang1, Wugui Chen2, Chenhui Cai1
1Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400037, China.
Background:
Severe spinal deformities requiring Schwab grade 4-6 osteotomies carry high neurological risks due to instability during anterior column resection. Conventional temporary fixation fails to address shear stress in anterior-deficient scenarios, prompting our hinge preservation technique to maintain biomechanical continuity and reduce spinal cord strain.
Purpose:
To assess the safety and efficacy of a modified spinal osteotomy technique that preserves the biomechanical hinge in multilevel spinal osteotomies (Schwab grade 4-6) for severe deformities, aiming to answer the following questions: (1) Does the hinge preservation technique significantly reduce the incidence of intraoperative neuromonitoring (IONM) alerts compared to conventional osteotomy? (2) Does it lead to better early functional recovery or fewer long-term implant-related complications? (3) Does it achieve comparable radiographic correction rates?
Methods:
This retrospective analysis of 115 patients (June 2016-June 2023, 44 month follow-up) compared conventional osteotomies (n = 54) with hinge preservation techniques (n = 61). The innovative method emphasized preservation of concave vertebral cortex/anterior ligaments to maintain a protective biomechanical hinge during correction. Outcomes included IONM alerts, neurological complications, radiographic parameters (Cobb/kyphosis angles), and patient functional scores (VAS/SRS-22).
Results:
Baseline characteristics and operative metrics (time/blood loss) were similar between cohorts (P > 0.05). The hinge preservation group demonstrated significantly reduced IONM alerts (18% vs. 59%, P < 0.001) with a 3.3-fold lower alert risk (P < 0.05) and a trend toward shorter hospitalization (P = 0.05). Neurological complication rates were numerically lower (4.9% vs. 13%, P = 0.19). Both groups achieved comparable radiographic correction (Cobb: 53 ± 16% vs. 57 ± 16%; kyphosis: 63 ± 15% vs. 68 ± 15%, P > 0.05) and equivalent functional recovery/maintenance at final follow-up.
Conclusion:
The hinge preservation technique, which was systematically evaluated in this study, significantly reduces intraoperative neurological stress (evidenced by IONM data and lower complication rates) while achieving comparable deformity correction. This method offers a safe alternative for high-risk patients undergoing complex spinal osteotomies.
Level Of Evidence:
III; retrospective cohort study.
