Biomechanical analysis of a novel bridging plate for treating Rockwood III acromioclavicular joint dislocation.
10.12122/j.issn.1673-4254.2025.05.24
- Author:
Yancai CHEN
1
;
Gaofeng ZHANG
2
;
Shubo LI
1
;
Nianxiang LUO
1
;
Yi ZHANG
3
Author Information
1. Spine and Joint Surgery, Xingtan Hospital Affiliated to Shunde Hospital of Southern Medical University, Foshan 528306, China.
2. Chongqing Sanyou Machinery Manufacturing Co., Ltd, Chongqing 400074, China.
3. Pan-Asia Business School, Yunnan Normal University, Kunming 650092, China.
- Publication Type:Journal Article
- Keywords:
acromioclavicular dislocation;
biomechanical property;
finite element model;
fixed mechanism;
new acromioclavicular joint plate
- MeSH:
Acromioclavicular Joint/surgery*;
Humans;
Bone Plates;
Biomechanical Phenomena;
Finite Element Analysis;
Joint Dislocations/surgery*;
Fracture Fixation, Internal/methods*
- From:
Journal of Southern Medical University
2025;45(5):1103-1112
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVES:To assess the biomechanical performance of a novel bridging plate for treating Rockwood III acromioclavicular joint dislocation.
METHODS:A novel bridging plate structure was designed based on CT data from a patient with Rockwood type III acromioclavicular joint dislocation, and a finite element model of the bridging plate-acromioclavicular joint interaction was constructed. The stress and deformation characteristics and biomechanical compatibility of the plate under post-reduction, normal loading, and impact loading conditions were analyzed to evaluate its fixation mechanism and clinical advantages.
RESULTS:The stiffness of the bridging system was 27.78 N/mm, close to that of acromioclavicular joint ligaments (26.05 N/mm) and meeting the requirements for flexible deformation. Under normal loading, the maximum stress in the bridging system was 88.29 MPa to sustain physiological activities; under impact loading, the maximum stress reached 480 MPa, and the cable underwent plastic deformation to dissipate energy and effectively buffer local stress concentrations, thereby reducing the risk of rigid bone fractures. The high-stress regions in the bone primarily occurred at the edges of the C1-C4 screw holes. The maximum bone stress was 0.762 MPa under normal loading and 5.963 MPa under impact loading, accounting for 2.86% and 1.66% of the corresponding bolt stresses, respectively.
CONCLUSIONS:The novel bridging plate is better adapted to biomechanical characteristics of the acromioclavicular joint compared to traditional internal fixation. This fixation system provides sufficient stability while allowing physiological micromotion to facilitate postoperative rehabilitation. Significant flexible deformation can occur at the connection between the fixation ring and the cable, and brittle materials should not be used in this region. The issue of stress concentration at the C1-C4 screw holes requires special attention in its clinical application.
