Biomechanical comparison of Gofried positive support reduction of Pauwels type III femoral neck fractures: A finite elements analysis.

Autor: Ding M; Wuxi 9th People's Hospital Affiliated to Soochow University, Wuxi 214023, China. Electronic address: dingming2017@163.com., Su Z; School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China. Electronic address: zhihaosu98@163.com., Wang D; Shanghai ZD Medical Technology Co., Ltd., Shanghai, 200131, China. Electronic address: dywang@zdmedtech.com., Mo L; Wuxi 9th People's Hospital Affiliated to Soochow University, Wuxi 214023, China. Electronic address: 107443060@qq.com., Mei J; Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affili-ated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200233, China. Electronic address: meijiong@sjtu.edu.cn., Sun W; Department of Orthopaedic Surgery, Pudong New Area Peoples' Hospital, Shanghai, 201299, China. Electronic address: 476773533@qq.com., Li S; Department of Orthopaedic Surgery, Pudong New Area Peoples' Hospital, Shanghai, 201299, China. Electronic address: lishuang527@126.com., Ni M; Department of Orthopaedic Surgery, Pudong New Area Peoples' Hospital, Shanghai, 201299, China; Department of Orthopaedic Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 200025, Shanghai, China. Electronic address: gendianqing@163.com.
Jazyk: angličtina
Zdroj: Injury [Injury] 2024 Dec; Vol. 55 (12), pp. 111979. Date of Electronic Publication: 2024 Oct 23.
DOI: 10.1016/j.injury.2024.111979
Abstrakt: Objective: This study aims to investigate the biomechanical characteristics of non-anatomical reduction and different screw positions on the stability of Pauwels type III femoral neck fractures.
Methods: Three-dimensional finite element models of femoral neck fractures were constructed using CT images. Four types of internal fixation methods were simulated, including biplane double-supported screw fixation (BDSF), three inverted triangular parallel cannulated screws (3CS), new parallel cannulated screws with posterior screws moving down (New 3CS), and two parallel cannulated screws (2CS). von Mises stress and total displacement were compared between the fracture models after the femoral head was subjected to an axial load of 2100 N. Stress and displacement data for the implants and the femur were recorded for each fixation method and compared.
Results: The results demonstrated that positive reduction of a Pauwels type III femoral neck fracture provided greater stability than neutral or negative reduction. Specifically, the BDSF group showed the lowest maximum von Mises stress in the femur (17.66 MPa) in positive reduction, compared to 3CS (21.08 MPa), New 3CS (22.14 MPa), and 2CS (36.57 MPa). The total displacement of positive reduction in the BDSF group was 0.3143 mm, which was lower than in the 3CS (0.3498 mm), New 3CS (0.3343 mm), and 2CS (0.4533 mm) groups. The stress distribution in the positive support reduction group was lower than that of the other groups, indicating better load distribution. Among the three-screw fixation methods, the New 3CS system exhibited the highest stress in the screws (with a peak of 28.62 MPa), while the 2CS group displayed the highest stresses overall, both in the femur and the screws.
Conclusion: For Pauwels type III femoral neck fractures, a positive support reduction with BDSF fixation exhibited superior biomechanical performance than negative reduction. Based on the finite element analysis conducted in this study, the positive support reduction with BDSF fixation can enhance fixation stability, suggesting that non-anatomical reduction is recommended.
Competing Interests: Declaration of competing interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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