Comparison of Three Internal Fixation Constructs for AO/OTA 33-A3 Distal Femoral Fractures: A Biomechanical Study

作者：Wei Xie, Hui Liu, Shufen Chen, Weizhen Xu, Weibin Lin, Tianlai Chen, Lingqi Zhu, Wenliang Zhai, Jin Wu · 发表于：Bioengineering · 年份：2024 · DOI：10.3390/bioengineering11111110 · 被引用次数：5 · 研究领域：Bone fractures and treatments、Hip and Femur Fractures、Orthopaedic implants and arthroplasty

BACKGROUND: To compare the biomechanical performance of three internal fixation constructs for AO/OTA 33-A3 distal femoral fractures. METHODS: Thirty AO/OTA 33-A3 synthetic distal femoral fracture models were constructed and randomly divided into three groups. Group A (dual-plate construct) was fixed with a medial locking plate combined with a less invasive stabilization system (LISS). Group B was fixed with a retrograde femoral nail (RFN) combined with an LISS (RFN + LISS construct), and Group C was fixed with a retrograde tibial nail (RTN) combined with an LISS (RTN + LISS construct). The axial displacement, axial stiffness, torsional displacement, torsional stiffness and maximum failure load of different internal fixation constructs were recorded and statistically analyzed. RESULTS: In the axial compression test, the average stiffness of Group C was significantly higher than that of Groups A and B, and the average displacement of Group C was significantly smaller than that of Groups A and B. In the torsion test, the torsion degree of Group C was significantly lower than that of Groups A and B, and Group C had a higher torsional stiffness than Groups A and B. In the axial compression failure test, the average ultimate load (a displacement greater than 5 mm) of Group C was significantly higher than that of Groups A and B. CONCLUSION: The biomechanical strength of the RTN combined with a plate is higher than that of the RFN combined with plate and dual-plate constructs, which...