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Bone mass, bone strength, muscle-bone interactions, osteopenias and osteoporoses
José Luis Ferretti1, Gustavo Roberto Cointry, Ricardo Francisco Capozza
1Center for P-Ca Metabolism Studies (CEMFoC), National University of Rosario, Buenos Aires, Argentina. jlferretti@arnet.com.ar
Mechanisms of Ageing and Development
|March 29, 2003
Summary
This review reconciles bone mass and biomechanical viewpoints, proposing that bone strength relies on material quality and architecture, not just mass. Densitometry and advanced imaging can differentiate bone diseases by assessing muscle-bone interactions.
Area of Science:
- Orthopedics and Sports Medicine
- Biophysics
- Gerontology
Background:
- The skeleton is viewed densitometrically as a regulated mass that declines with age, increasing fracture risk.
- Alternatively, biomechanically, the skeleton is a structure regulated by stiffness, material, and architectural properties.
- The bone 'mechanostat' system optimizes stiffness by modulating bone quality and architecture, influenced by mechanical stimuli like muscle contractions.
Purpose of the Study:
- To reconcile densitometric and biomechanical perspectives on bone health.
- To explore diagnostic methods for differentiating bone-weakening diseases.
- To analyze crucial muscle-bone interactions for differential diagnosis.
Main Methods:
- Review of existing literature on bone densitometry and biomechanics.
- Proposal of advanced imaging techniques (e.g., bone tomography, MRI) for assessing bone structure and strength.
- Analysis of muscle and bone mass and strength relationships.
Main Results:
- Densitometric 'mass' measurements offer insights but cannot directly assess bone strength.
- Biomechanical assessment of bone quality, architecture, and stiffness is crucial for understanding bone strength.
- Muscle-bone interactions are key determinants of skeletal health and disease.
Conclusions:
- A combined approach using densitometry and biomechanical assessment can differentiate between osteopenia and osteoporosis.
- Differential diagnosis of bone diseases requires evaluating intrinsic factors, mechanical stimulation, and systemic influences.
- Assessing bone and muscle mass and strength through advanced imaging provides a more comprehensive understanding of skeletal integrity.