[Biomechanical comparison of three kinds of fixation instruments for calcaneal osteotomy]
Jiyue Bai1, Yongqing Xu2, Xiaoqing He3
1Graduate Management Brigade, Army Medical University, Chongqing, 400038, P.R.China.
Objective:
To compare the biomechanical characteristics of self-made nickel-titanium shape memory alloy stepped plate with calcaneal plate and cannulated compression screws in fixing calcaneal osteotomy.
Methods:
Calcaneal osteotomy was operated on 6 fresh-frozen lower limbs collected from donors. Then three kinds of fixation materials were applied in random, including the self-made nickel-titanium shape memory alloy stepped plate (group A), calcaneal plate (group B), and cannulated compression screws (group C). Immediately after fixation, axial loading of 20-600 N and 20 N/s in speed was introduced to record the biomechanical data including maximum displacement, elastic displacement, and maximum load. Then fatigue test was performed (5 Hz in frequency and repeat 3 000 times) and the same axial loading was introduced to collect the biomechanical data. Finally, the axial compression stiffness before and after fatigue test were calculated.
Results:
There was no significant difference in the axial compression stiffness between pre- and post-fatigue test in each group ( P>0.05). However, the axial compression stiffness was significant higher in group A than that in groups B and C both before and after fatigue test ( P<0.05). No significant difference was found between group B and group C ( P>0.05).
Conclusion:
Self-made nickel-titanium shape memory alloy stepped plate is better than calcaneal plate and cannulated compression screws in axial load stiffness after being used to fix calcaneal osteotomy.
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