Stiffening effects of cortical bone on vertebral cancellous bone in situ.

摘要: Study Design. This study tested a theory about vertebral cancellous bone stiffness by performing experimental tests and comparing the results with theoretical predictions. Objectives. To test experimentally prediction that appears stiffer than would be expected from isolated because of constraining effects cortical bone, to measure magnitude this strengthening effect its dependency on tissue composition density. Summary Background Data. Vertebral bodies are composed mainly surrounded thin shell much stronger bone. Little is known ways in which these two materials function synergistically produce strong but light structures why sometimes extensive damage has apparently little outward body strength. Methods. Cancellous 45 lumbar vertebrae homogeneous group pigs was compression both situ as an excised cylinder. The density were then measured correlation measurements. Results. when factor 4 (range, 1.6-12). No found between stiffness, either or isolation, density, although predicted entirely volume fractions water, organic, mineral phases. Conclusions. Combining low stiffer, more dense leads lightweight structure might properties components.