Human Musculoskeletal Tolerance Limits to Ejection and Related High Mechanical Stress Environments.
Abstract
A scheme was devised for determining the mechanical stiffness of joints subjected to large displacements. A system for taking two simultaneous orthogonal x-rays was constructed. With successive bi-plane x-rays taken at different intensities and directions of loading, a stiffness matrix could be formulated. A second phase utilized a simple one-dimensional load cell which measured applied loads. Loads were recorded on an oscilloscope and strain gage amplifiers. Orientation of the force in three-dimensional space could be visualized on the bi-plane films, enabling a precise calculation of the geometry of the loading system to be made. The first series was conducted on fresh cadaver knees. Loads were applied so as to produce a varus and valgus displacement. Simultaneous bi-plane films were taken. Volunteers were selected for the same procedures excpet that no marker system would be utilized.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1977
- Accession Number
- ADA042864
Entities
People
- Albert H. Burstein
Organizations
- Case Western Reserve University