A new pediatric femoral neck system for pediatric femoral neck fractures with a free fracture fragment: a biomechanical analysis
10.3760/cma.j.cn115530-20230609-00283
- VernacularTitle:新型儿童股骨颈系统固定带游离骨块的儿童股骨颈骨折的生物力学性能研究
- Author:
Jinchen CHEN
1
;
Dianhua HUANG
;
Yunan LU
;
Tianlai CHEN
;
Yuwei NING
;
Shunyou CHEN
Author Information
1. 福州市第二医院小儿骨科，福建省创伤骨科急救与康复临床医学研究中心，福州 350007
- Keywords:
Femoral neck fractures;
Fracture fixation, internal;
Internal fixators;
Biomechanics;
Free fracture fragments
- From:
Chinese Journal of Orthopaedic Trauma
2023;25(12):1074-1078
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the biomechanical properties of a new pediatric femoral neck system in the fixation of pediatric femoral neck fractures with a free fracture fragment.Methods:Ten Sawbones model bones were randomly divided into 2 even groups ( n=5), all of which were made into Delbet Type Ⅱ femoral neck fractures with a Pauwels angle of 70°. A free bone block was removed from the bottom at the proximal end of the fracture to simulate a femoral neck fracture with a free fragment. Group A were fixed with traditional inverted triangle cannulated screws, and group B with a new pediatric femoral neck system. After the 2 groups of specimens were placed on a biomechanical testing machine, each specimen was subjected to a static axial compression test, an anti-torsion test and a cyclic load test in turn. The biomechanical results were compared between groups A and B in aspects of axial compression stiffness, torsional stiffness and maximum displacement difference. Results:The axial compression stiffness [(321.718±5.770) N/mm] and torsional rigidity [(1.448±0.079) N·m/°] in group B were significantly higher than those in group A [(266.722±4.788) N/mm and (1.282±0.023) N·m/°] ( P<0.05). The maximum displacement difference in the cyclic load test in group B [(0.063±0.038) mm] was also significantly smaller than that in group A [(0.117±0.056) mm] ( P<0.05). Conclusion:In fixation of pediatric femoral neck fractures with a free fracture fragment, the new pediatric femoral neck system can lead to better biomechanical stability than the traditional inverted triangle cannulated screws.
