Impact of fixiation spondylolysis using the aerofoil–shaped Ni-Ti alloy on the intervertebral disc
WANG Jian, ZHU Li-xin，YANG Hui，GU Qin-wen，PENG Dao-hu，LI Sen
Chinese Journal of Clinical Anatomy ›› 2018, Vol. 36 ›› Issue (6) : 674-677.
Impact of fixiation spondylolysis using the aerofoil–shaped Ni-Ti alloy on the intervertebral disc
Objective Application of Ni-Ti alloy fixation (AEROFOIL FIXATION) in spondylolysis has been successful. The aim of this study was to analyze its impact on the intervertebral disc using the finite element model. Methods A three-dimensional non-linear finite element(FE) model of spondylolysis has been developed. Von Mises stresses and distributions of intervertebral disc were analyzed in flexion, extension, left lateral bending and left axial rotation. Results Under different conditions, the maximum stresses of affected disc were increased to 105%、102%、101% and 111%，respectively. After direct repair by AEROFOIL FIXATION technique, the affected disc stresses decreased to 67%, 55%, 88% and 83%, respectively. Conclusions AEROFOIL FIXATION, due to its reasonable structure and excellent biomechanical properties that can prevent the anterior degeneration intervertebral disc and, should be promoted in clinical application, providing another choice for the treatment of lumbar spondylolysis.
Ni-Ti alloy; Spondylolysis / Intervertebral disc; Finite element
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