The Influence of Surgical Herniation on the Viscoelastic Properties of the Intervertebral Joint.
Abstract
This thesis investigates the influence of surgical herniation on the viscoelastic properties of the intervertebral joint. The prepared specimen consisted of the intervertebral joint and the two adjacent vertebral centrums without either the posterior elements or associated soft tissues. The prepared specimen was subjected to a constant compressive load of sixty-seven newtons for eight hours followed by a relaxation of sixteen hours. The specimens were then subjected to various stages of herniation and the creep tests were repeated after each herniation. The analysis was also carried out in several phases. First the experimental data was graphed using a specially prepared plotting routine for the Cyber 750 machine. A mean displacement curve was then obtained for each set of creep tests by averaging the displacement vs. time curve of each test phase. Next, all specimens were dissected and measured to obtain data needed in formulating a finite element model. In the final phase of the analysis, a viscoelastic axisymmetric finite element model was used to quantify the experimental data. A three parameter Kelvin solid was employed in the finite element solution method.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA111097
Entities
People
- David R. Furlong
Organizations
- Air Force Institute of Technology