Effects of artificial disc replacement with angles on stress of adjacent intervertebral disc
10.3969/j.issn.1003-0034.2014.09.011
- VernacularTitle:角度人工椎间盘置换后对相邻下位椎间隙应力的影响
- Author:
Chuanyi BAI
1
;
Wei-Jie ZHANG
;
Wenbo WEI
;
Wei LING
;
Zhen-Xing TIAN
;
Xiao-Qian DANG
;
Kun-Zheng WANG
Author Information
1. 西安交通大学医学院第二附属医院骨一科
- Keywords:
Cervical vertebrae;
Intervertebral disk;
Biomechnics
- From:
China Journal of Orthopaedics and Traumatology
2014;(9):756-761
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate stress changes of intervertebral space and adjacent intervertebral space after artificial disc replacement with angles. Methods:Artificial disc replacement with angles were designed according to existing data. Axial pressure,flexion/extension,lateral bending and torsion loading were applied on finite element models of normal cervical discs on C4,5 segments,C4,5 segments with 0°artificial cervical discs and C4,5 segments with 10°artificial cervical discs,then stress changes of C4,5 space was observed. The same loadings were applied on finite element models of normal cervical discs on C 4-C6 segments,C4,5 segments with 0°,C4,5 segments with 10°,then stress changes of replaced segments space and adjacent segment space were observed. Results:For C4,5 segments,80 MPa/0°artificial discs and 80 MPa/10°artificial discs had the similar e-quivalent shear stress(Se),and were both larger than that of normal discs,when lateral bending were performed,80 MPa/0°ar-tificial discs were closed to normal discs when axial pressure and flexion/extension were carried out ,while 80 MPa/10°artifi-cial discs had a larger Se than that of normal ones,when torsion loading were applied,Szx/Szy stress of 80 MPa/0°and 80 MPa/10°artificial discs were closed to normal ones. For C4-C6 segments,the axial pressure,flexion/extension and lateral bend-ing of C5,6 were all lower than normal discs after C4,5 discs were replaced by 80 MPa/10°artificial discs,while Szx/Szy of torsion loading were closed to normal ones. Conclusion:Artificial discs with 10° have less influences on stress of adjacent interverte-bral space and closer to mechanical property after being implanted into intervertebral space.
