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Wu T, Chen H, Sun Y, Xia T, Zhou F, Lu WW. Patient-specific numerical investigation of the correction of cervical kyphotic deformity based on a retrospective clinical case. Front Bioeng Biotechnol 2022; 10:950839. [PMID: 36159686 PMCID: PMC9500315 DOI: 10.3389/fbioe.2022.950839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 08/12/2022] [Indexed: 11/22/2022] Open
Abstract
Little research has been reported on evaluating the safety of the fixation construct in cervical kyphosis correction. In this study, we proposed a principal-strain criterion to evaluate the safety of the fixation construct and validated the modeling method against a retrospective case of anterior cervical discectomy fusion (ACDF). From C2 to T2 vertebra bodies, fixation instruments were reconstructed and positioned as per postoperative computed tomography (CT) scans. Head weight (HW) and various moments estimated from isometric strength data were imposed onto the C2. The postoperative stability of non-surgical segments, deformations surrounding the screw trajectories, and contact slipping on zygapophysial joints were analyzed. The model was validated against the reality that the patient had a good fusion and deformity correction. The ACDF restricted the range of motions (ROMs) of cervical segments and lent stability to vertebra fusion, no failure was found in the finite element (FE) model of cervical vertebrae. The deformation surrounding the screw trajectories were concentrated to the lateral sides of trajectories, recommending that the shape of the anterior cervical plate conforming to the curvature of the vertebra and screws fully inserted into vertebrae reduced the deformation concentration around the screw trajectories.
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Affiliation(s)
- Tianchi Wu
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong SAR, China
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Hongyu Chen
- Department of Orthopaedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Beijing, China
- Beijing Key Laboratory of Spinal Disease Research, Beijing, China
| | - Yu Sun
- Department of Orthopaedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Beijing, China
- Beijing Key Laboratory of Spinal Disease Research, Beijing, China
| | - Tian Xia
- Department of Orthopaedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Beijing, China
- Beijing Key Laboratory of Spinal Disease Research, Beijing, China
| | - Feifei Zhou
- Department of Orthopaedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Beijing, China
- Beijing Key Laboratory of Spinal Disease Research, Beijing, China
- *Correspondence: Feifei Zhou,
| | - William W. Lu
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong SAR, China
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, China
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