Biomechanics of Bones and Ligaments in Primates: The Effect of Immobilization on Ultimate Properties.
Abstract
Experiments were conducted to determine the effects of immobilization on bones and ligaments in Macaca mulata. Rehsus monkeys of similar size were divided into two groups--a group to serve as controls and a group to be immobilized for eight weeks in full body casts. Three types of tests were conducted for each group: tension of anterior cruciate bone-ligament-bone preparations, torsion of tibae, femora, and humeri, and four-point bending of second, third, and fourth metatarsals. All specimens were loaded to failure. Experimental apparatus and procedures are described. After eight weeks of immobilization bone-ligament-bone preparations are shown to experience a 26% reduction in structural strength, a shift in failure mode, and an increase in structural flexibility. Tibae, femora, and humeri undergo reductions in strength. Tibial and femoral fractures shift toward the knee; the percentage of bone involved in humeri fractures decreases. Structural flexibility is increased for femora and humeri and remains the same for tibae. Metatarsals are not affected with regard to structural properties. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1972
- Accession Number
- AD0769244
Entities
People
- Walter B. Hyde
Organizations
- Air Force Institute of Technology