Studying trabecular bone samples demonstrates a power law relation between deteriorated structure and mechanical...

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Mechanical Engineering

Background:

• Bone volume fraction (BV/TV) is crucial for trabecular bone mechanics.
• Previous studies lacked individualized analysis of structural deterioration and mechanical properties.
• Osteoporosis research requires better methods to assess bone strength and fracture risk.

Purpose of the Study:

• To investigate the mathematical relationship between structural deterioration and mechanical properties in trabecular bone.
• To overcome limitations of traditional methods by using 3D printing and micro-finite element analysis (μFEM).
• To establish a more precise understanding of how decreasing bone volume fraction affects bone strength.

Main Methods:

• 3D printing of structural-identical, BV/TV-attenuated trabecular bone samples from rat femurs.
• Compression mechanical testing of 3D printed samples.
• Establishment of μFEM models for simulation and analysis, with corrections for side artifacts.

Main Results:

• A significant power law function was observed between corrected tissue modulus, corrected strength, and corrected effective tissue modulus (Ez) with BV/TV.
• This relationship was confirmed in structural-identical but BV/TV-attenuated trabecular bone samples.
• The findings validate the long-known relationship between bone volume fraction and mechanical properties.

Conclusions:

• 3D printing enables the creation of standardized bone models for mechanical testing.
• The study confirms the power law relationship between BV/TV and bone mechanical properties.
• Future applications include improved bone strength evaluation and personalized fracture risk assessment for osteoporosis patients.