title: [Effects of artificial disc replacement with angles on stress of adjacent intervertebral disc].
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 degrees artificial cervical discs and C4,5 segments with 10 degrees 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 C4-C6 segments, C4,5 segments with 0 degrees, C4,5 segments with 10 degrees, then stress changes of replaced segments space and adjacent segment space were observed.
  
  
  RESULTS
  For C4,5 segments, 80 MPa/0 degrees artificial discs and 80 MPa/10 degrees artificial discs had the similar equivalent shear stress (Se), and were both larger than that of normal discs, when lateral bending were performed, 80 MPa/0 degrees artificial discs were closed to normal discs when axial pressure and flexion/extension were carried out, while 80 MPa/10 degrees artificial discs had a larger Se than that of normal ones,when torsion loading were applied, Szx/Szy stress of 80 MPa/0 degrees and 80 MPa/10 degrees artificial discs were closed to normal ones. For C4-C6 segments, the axial pressure, flexion/extension and lateral bending of C5,6 were all lower than normal discs after C4,5 discs were replaced by 80 MPa/10 degrees artificial discs, while Szx/Szy of torsion loading were closed to normal ones.
  
  
  CONCLUSIONS
  Artificial discs with 10 degrees have less influences on stress of adjacent intervertebral space and closer to mechanical property after being implanted into intervertebral space.
authors.affiliation: First Department of Orthopaedics, Affiliated  Hospital of Medical College, Xi'an Jiantong University, Shaanxi, China. baichuanyiys@sina.com
authors.forename: Chuan-Yi
authors.initials: CY
authors.lastname: Bai
authors.forename: Wei-Jie
authors.initials: WJ
authors.lastname: Zhang
authors.forename: Wen-Bo
authors.initials: WB
authors.lastname: Wei
authors.forename: Wei
authors.initials: W
authors.lastname: Ling
authors.forename: Zhen-Xing
authors.initials: ZX
authors.lastname: Tian
authors.forename: Xiao-Qian
authors.initials: XQ
authors.lastname: Dang
authors.forename: Kun-Zheng
authors.initials: KZ
authors.lastname: Wang
mesh_terms: D002574:Cervical Vertebrae / Q000601:surgery*; D006801:Humans; D013314:Stress, Mechanical; D059145:Total Disc Replacement / Q000379:methods*