Distal dynamic locking and distal static locking of proximal femoral bionic intramedullary nails: a biomechanical finite element analysis
10.3760/cma.j.cn115530-20231114-00196
- VernacularTitle:股骨近端仿生髓内钉远端不同锁定方式固定股骨转子间骨折的生物力学研究
- Author:
Yuchuan WANG
1
;
Xiaodong CHENG
;
Yanbin ZHU
;
Yonglong LI
;
Zhongzheng WANG
;
Yanjiang YANG
;
Wei CHEN
;
Yingze ZHANG
Author Information
1. 河北医科大学第三医院创伤急救中心，河北省骨科研究所，河北省骨科生物力学重点实验室，国家卫生健康委骨科智能器材实验室，石家庄 050051
- Keywords:
Finite element analysis;
Hip joint;
Fractures, stress;
Intertrochanteric fracture;
Proximal femur bionic nail
- From:
Chinese Journal of Orthopaedic Trauma
2024;26(2):138-142
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To characterize the biomechanics of distal dynamic locking and distal static locking of proximal femur bionic nails (PFBN) in fixation of intertrochanteric fractures by a finite element analysis.Methods:The CT image data from the hip to the upper tibia from an adult male volunteer were used to establish a three-dimensional model of the femur by Mimics 20.0 and Geomagic 2013 which was processed further into a model of Evans type I intertrochanteric fracture by software NX 12.0. With reference to the internal fixation parameters commonly used, 4 models of PFBN fixation were established: distal single transverse nail dynamic locking (model A), single oblique nail dynamic locking (model B), single nail static locking (model C) and double nail dynamic locking (model D). Abaqus 6.14 software was used to load and analyze the internal fixation stresses and displacements of fracture ends.Results:Under a 2100N loading, the peak stress was located upon the main nail in the 4 models. The smallest peak stress upon the main nail was in Model D (161.9 MPa), decreased by 15.9% compared with model A (192.5 MPa), by 15.6% compared with model B (191.9 MPa), and by 0.9% compared with model C (163.3 MPa). The peak stress upon the fixation screw was the largest in model A (95.3 MPa), the smallest in model B (91.5 MPa), and 91.5 MPa and 92.2 MPa in models C and D, respectively. The overall displacements of the implants, in a descending order, were 10.14 mm in model A, 10.10 mm in model B, 10.09 mm in model C, and 10.05 mm in model D. Similarly, the displacements of fracture ends were 0.125 mm in model A, 0.121 mm in model B, 0.110 mm in model C, and 0.098 mm in model D.Conclusion:Compared with dynamic locking, distal static locking of PFBN provides a better mechanical stability and reduces stress concentration upon internal fixation.
