Osteoregulatory nature of mechanical stimuli: Function as a determinant for adaptive remodeling in bone

TLDR

The study investigates the capacity for functional adaptation within the skeleton using a functionally isolated turkey ulna preparation. The authors employed this isolated ulna model to examine bone remodeling responses to mechanical strain. Adaptive bone remodeling is highly sensitive to strain magnitude and distribution, requires dynamic loading, can be triggered by brief exposure, and each bone region is tuned to a specific optimal strain pattern.

Abstract

Abstract The capacity for functional adaptation within the skeleton was studied using the functionally isolated turkey ulna preparation. The results of this study would suggest that adaptive bone remodeling is extremely sensitive to alterations in both the magnitude and distribution of the strain generated within the bone tissue. At present, it appears that a loading regime can only influence bone remodeling when it is dynamic in nature. The full osteogenic potential of its influence is then achieved after only an extremely short exposure to this stimulus. The potency of the stimulus appears to be proportional to the magnitude of the strain engendered. As strain levels that are acceptable in one location induce adaptive remodeling in others, it would appear that each region of each bone is “genetically programmed” to accept a particular amount and pattern of intermittent strain as “normal.” Deviation from this “optimal strain enviroment” will stimulate changes in the bone's remodeling balance, resulting in adaptive increases or decreases in its mass.