title: [Correlation of the (rotation) traction force with the pressure in the nucleus pulposus in multiple segments of the cervical vertebra].
abstract: OBJECTIVE
  To study the correlation between cervical (rotation) traction force and the pressure in the cervical nucleus pulposus based on an examination of multiple segments of the cervical vertebra.
  
  
  METHODS
  The data obtained from our observation were processed by the exponential model, and the changes in the pressure reduction (P) in the cervical nucleus pulposus were analyzed.
  
  
  RESULTS
  When stretching followed by rotation was imposed on the cervical vertebra, an increase of P was first observed due to the stretching before a reduction in P caused by the rotation. The P of C(3-4) segments was constantly greater than that of C(5-6) segments, while the changes in P of C(4-5) followed different patterns.
  
  
  CONCLUSIONS
  Changes of P in each segment of the cervical vertebra are similar in response to the load force, and there is no correlation of monotonic increase or decrease between the changes of P and the location of the cervical vertebra.
authors.affiliation: Department of Biomedical Engineering, First Military Medical University, Guangzhou 510515, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhou
authors.forename: Yi-Kai
authors.initials: YK
authors.lastname: Li
authors.forename: Yue-Hua
authors.initials: YH
authors.lastname: Xu
mesh_terms: D002574:Cervical Vertebrae / Q000502:physiology*; D012044:Regression Analysis; D012399:Rotation; D013223:Statistics as Topic