Biomechanical characteristics of the modified memory alloy internal fixator for separation of pubic symphysis

doi:10.3969/j.issn.2095-4344.2908

Abstract

Abstract:

BACKGROUND: The memory alloy itself has unique shape memory properties and excellent histocompatibility, which is currently made into various internal fixators widely for the surgical treatment of the fretting joint and the fracture site.

OBJECTIVE: To investigate the biomechanical characteristics of the modified memory alloy internal fixator for separation of pubic symphysis.

METHODS: Models of pubic symphysis separation injury were established in 10 pelvic specimens and randomly divided into two groups for fixation. Models in the observation group were fixed with the modified memory alloy internal fixator for separation of pubic symphysis after reduction. The models in the control group were fixed with dynamic compression plate after reduction. A universal biomaterial testing machine was used for biomechanical testing. The horizontal, anteroposterior and vertical displacements of the pubic symphysis were recorded.

RESULTS AND CONCLUSION: (1) There was no loosening or fracture of internal fixation in both groups. (2) The horizontal displacement of the observation group was smaller than that of the control group under different loads (P < 0.05). (3) The anteroposterior displacement of the observation group was smaller than that of the control group under different loads (P < 0.05). (4) The vertical displacement of the observation group was smaller than that of the control group under different loads (P < 0.05). (5) The experimental results show that the tensile force of the modified memory alloy internal fixator for separation of pubic symphysis against horizontal and anteroposterior directions is better than that against dynamic compression plate, which resistance to vertical shear force is better than that of dynamic compression plate.

Key words: bone, implants, internal fixation, memory alloy, fixation, steel plate, mechanics, biomechanics

CLC Number:

Zhou Jun, Gong Yusuo, Li Shenghua, Zhu Yanguo. Biomechanical characteristics of the modified memory alloy internal fixator for separation of pubic symphysis[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(36): 5764-5767.

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