Biomechanical comparison and analysis of three kinds of fixators in the treatment of Lisfranc injuries
LIU Shuai, XU Yong-qing, ZHANG Xu-lin, SUN Pei-dong, LIANG Dong-zhu
Chinese Journal of Clinical Anatomy ›› 2018, Vol. 36 ›› Issue (2) : 215-220.
Biomechanical comparison and analysis of three kinds of fixators in the treatment of Lisfranc injuries
Objective To evaluate the stability of new Ni-Ti memory alloy four-corner fixator in treatment of Lisfranc injuries and conduct comparative analysis with dorsal plate and transarticular screw fixation. Methods 6 sides of lower limbs from fresh adult cadavers were chosen to test static rigidity under the condition of 600Naxial load by ElectroForce® 3510 system. Groups were set : (A) Control, Undamaged group ; (B) Damaged group without treatment ; (C) Damaged group fixed by new Ni-Ti memory alloy four-corner fixator ; (D) Damaged group fixed by dorsal Plate ; (E) Damaged group fixed by transarticular screw fixation. Group B , C and D were cyclically loaded at 5 Hz between 200 and 600 N for 3000 cycles to test the change of immediate stabilization and fatigue stabilization. Results Paired t test was applied to analyze the difference of each group themselves after fatigue , which turned out to be of no statistically significance (P＞0.05) . Integral rigidity in group B was less than that in group A (P＜0.05) . There was no significant difference among Group A , C and D (P＞0.05) , but their integral rigidity were less than that of group E (P＜0.05). Conclusion New Ni-Ti memory alloy four-corner fixator could provide significant fixation strength for the treatment of Lisfranc injuries , which lays the foundation for its clinical use.
/ Ni-Ti memory alloy / Four-corner fixator / Lisfranc injuries / Biomechanics
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