Finite element analysis of new headless compression supporting screw for the treatment of unstable femoral neck fracture

Article type: Research Article

Authors: Xue, Yang^a; | Wang, Xiong-Fei^a; | Zhao, Fu-Long^a | Han, Da-Cheng^a | Long, An-Hua^a | Wang, Jin^b; | Zhang, Ya-Kui^a; | Wang, Xue-Fei^a;

Affiliations: [a] Department of Trauma and Orthopaedics, Beijing LuHe Hospital Affiliated to Capital Medical University, Beijing, China | [b] School of Chemistry and Chemical Engineering, Nantong University, Nantong, China

Correspondence: [*] Corresponding authors: Jin Wang, School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China. E-mail: wangjin110@ntu.edu.cn. Ya-Kui Zhang, Department of Trauma and Orthopaedics, Beijing LuHe Hospital Affiliated to Capital Medical University, Beijing 101100, China. E-mail: zhangyakui@vip.sina.com. Xue-Fei Wang, Department of Trauma and Orthopaedics, Beijing LuHe Hospital Affiliated to Capital Medical University, Beijing 101100, China. E-mail: xuefeiw@vip.sina.com

Note: [†] These authors contributed equally to this study.

Abstract: BACKGROUND:Femoral neck fracture is an unsolved challenge in orthopedics. The complication rate in particular is high. There remains a lack of consensus on the optimal choice of internal fixation for unstable femoral neck fracture. OBJECTIVE:The study aimed to develop a new headless compression supporting screw (HCSS) for the treatment of unstable foemoral neck fracture. METHODS:We designed a new HCSS and used a femoral neck fracture (Pauwels III fracture) model (left, fourth-generation composite, Sawbones) and three-dimensional finite element analysis to compare the biomechanical performance of HCSSs with that of cannulated compression screws (CCSs) for treatment of unstable femoral neck fracture. RESULTS:Maximum displacement, peak von Mises stress, peak strain, and rotation for the HCSS were smaller than those for the CCS. The stress was more widely distributed for the HCSS, whereas the stress was concentrated for the CCS. CONCLUSIONS:The HCSS resulted in better biomechanical stability than that from the CCS. For Pauwels III fractures the HCSS exhibits better resistance to shear forces and better support, providing a new clinical treatment.

Keywords: Femoral neck fracture, Pauwels III, fracture finite element analysis, cannulated compression screw, headless compression support screw

DOI: 10.3233/BME-211313

Journal: Bio-Medical Materials and Engineering, vol. 33, no. 4, pp. 279-292, 2022