Biomechanical properties of retrograde interlocking intramedullary nail versus less invasive stabilization system plate in the repair of distal femoral fractures

doi:10.3969/j.issn.2095-4344.2016.44.006

Abstract

Abstract:

BACKGROUND: Distal femoral fractures are mainly treated with less invasive stabilization system (LISS) plate or retrograde interlocking intramedullary nail fixation, but choosing which method is controversial, and studies on their biomechanical properties are few.

OBJECTIVE: To compare the biomechanical stability of retrograde interlocking intramedullary nail and LISS plate fixation in the treatment of distal femoral fractures.

METHODS: Twelve male cadaveric femurs were collected, and the injured, with abnormal bone density and osteonosus specimens were excluded through X-ray examination, followed by randomly divided into two groups. Models of AO type A3 supracondylar fracture were prepared, and were fixed with LISS plate and retrograde interlocking intramedullary nail, respectively. The compressive stiffness and displacement values under axial compression and loading of 100, 300 and 500 N, as well as the bending strength of the specimens under bending load were observed.

RESULTS AND CONCLUSION: (1) The resistance to axial deformation capacity (compressive stiffness) of the LISS plate was superior to the retrograde interlocking intramedullary nail (P < 0.05); while the resistance to bending deformation capacity (flexural strength) of the retrograde interlocking intramedullary nail was not significantly greater than that of the LISS plate (P > 0.05). (2) Under axial compressive loading of 100, 300 and 500 N, the displacement values of LISS plate were significantly less than those of the retrograde interlocking intramedullary nail (P < 0.05). (3) In conclusion, in the distal femoral fracture fixation, the stiffness of the retrograde interlocking intramedullary nail is low. While the LISS plate not only has certain deformation, but also has strong rigidity with firm internal fixation, which provides excellent biological environment for fracture healing; thus it is a reliable treatment for distal femoral fractures.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Femoral Fractures, Internal Fixators, Biomechanics, Tissue Engineering

CLC Number:

R318

Zhang Hui-dong, Wang Jing-wei, Bai Jing. Biomechanical properties of retrograde interlocking intramedullary nail versus less invasive stabilization system plate in the repair of distal femoral fractures[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(44): 6577-6582.

Figures/Tables 3

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