Kinesiology of the Locked Torso as a Function of Component Weight.
Abstract
Two subhuman primates were utilized to experimentally record the contribution of the musculoskeletal substructures to overall torso stability. Each specimen was euthenized and four small diameter surgical pins drilled into the spinous processes. A Stengstaken-Blakemore esophageal tube was threaded into the proximal esophagus and balloons inflated to define the diaphragm. One experiment consisted of static load application to the torso so that flextural, extensive and lateral bending were introduced. Abdominal pressure was taken from a transducer and multiple exposure photography used to measure the vertebral deformations corresponding to load increment from 0-2309 grams. A second experiment involved rotation of the pelvis, with the C-4, C-5 vertebrae fixed, from 0-110 deg and associated pressure recorded. For each experiment a progressive necropsy was accomplished and experimental steps repeated. Deformation measured, from scaled photographs, versus applied load was graphically compared. Both quantities were geometrically reduced along the axis of the spine and slope data tabulated. Relative reaction to loading for vertebrae C-4, T-3, T-8, L-2 and L-6 is tabulated for abdominal pressure and deformation in flexion, extension and side-bending and abdominal pressure from torsion. Castigliano's theorem was applied to a circular arc representation of the bent torso. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1978
- Accession Number
- ADA060837
Entities
People
- Arthur J. Nestle
Organizations
- Air Force Institute of Technology