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An approach for time-dependent bone modeling and remodeling-application: a preliminary remodeling simulation.
G S Beaupré1, T E Orr, D R Carter
1Rehabilitation Research and Development Center, Veterans Affairs Medical Center, Palo Alto, CA 94304.
Summary
This study models bone density distribution in the proximal femur using a time-dependent theory. It shows bone remodeling adapts to loading changes, influencing bone mass and structure.
Area of Science:
- Biomechanics
- Orthopedic Research
- Computational Biology
Background:
- Bone adapts its structure to mechanical loads through modeling and remodeling.
- Previous theories often simplify the complex, time-dependent nature of bone adaptation.
Purpose of the Study:
- To apply a time-dependent bone remodeling theory to predict bone density distribution in the proximal femur.
- To investigate functional adaptation of bone structure in response to altered loading histories.
- To compare linear and trilinear rate remodeling laws.
Main Methods:
- Utilized a time-dependent theory for bone modeling and remodeling.
- Employed 2D finite element models to simulate bone density changes.
- Assumed a fixed external geometry for the proximal femur.
- Simulated normal loading, reduced loading, and subsequent reinstatement of normal loading.
Main Results:
- Successfully generated a normal-appearing bone density distribution from a homogeneous state.
- Demonstrated regional bone atrophy following a reduction in loading.
- Observed a generalized increase in bone mass upon load reinstatement, with a slightly altered distribution compared to constant loading.
Conclusions:
- The time-dependent remodeling theory is effective for predicting bone density distribution and adaptation.
- Stress-related phenomena likely govern both normal bone development and adaptation to altered loading.
- The model supports the hypothesis that mechanical loading is a primary driver of bone structure changes.