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Related Experiment Videos

Bone "mass" and the "mechanostat": a proposal.

H M Frost1

  • 1Southern Colorado Clinic, Pueblo 81004.

The Anatomical Record
|September 1, 1987
PubMed
Summary

The mechanostat, a proposed bone-regulating mechanism, adapts bone mass to mechanical usage. It uses specific strain ranges to control bone growth and remodeling, influencing conditions like osteoporosis.

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Area of Science:

  • Bone biology and mechanobiology
  • Skeletal physiology
  • Biomechanical engineering

Background:

  • Bone mass is closely regulated by mechanical usage.
  • A regulatory mechanism, termed the mechanostat, is proposed to control bone mass.
  • This mechanism integrates mechanical signals to direct bone growth and remodeling.

Purpose of the Study:

  • To propose and describe the mechanostat hypothesis.
  • To explain how mechanical usage influences bone mass through specific biological activities.
  • To discuss the implications of the mechanostat in various bone diseases and conditions.

Main Methods:

  • Review and synthesis of existing in vivo studies on bone strain and mass.
  • Analysis of the anatomical distribution of mechanical effects on bone.
  • Discussion of evidence supporting the mechanostat model in different physiological and pathological states.

Main Results:

  • Bone modeling increases cortical bone mass at strains >= 1500 microstrain.
  • BMU-based remodeling removes bone at strains <= 300 microstrain.
  • The mechanostat model explains bone mass changes in conditions like postmenopausal osteoporosis and osteogenesis imperfecta.

Conclusions:

  • The mechanostat provides a unifying framework for understanding bone mass regulation.
  • Changes in mechanostat setpoints by disease or agents can explain observed bone pathologies.
  • Further experimental validation of the mechanostat is required.

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