[Bone structure and mechanical resistance of the bone tissue]

Area of Science:

• Orthopedics
• Biomedical Engineering
• Radiology

Background:

• Bone strength is influenced by both macro-geometry and the micro-architecture of the trabecular network.
• Aging and conditions like osteoporosis can alter trabecular organization, leading to reduced bone integrity.
• Understanding these structural changes is crucial for assessing fracture risk.

Purpose of the Study:

• To review methods for evaluating trabecular bone structure and its relationship to bone strength.
• To highlight emerging techniques for assessing bone micro-architecture and mechanical properties.
• To explore the potential of non-invasive methods for predicting bone health.

Main Methods:

• Histomorphometry with stereologic techniques for 3D analysis of bone slices.
• High-resolution computed tomography (CT) and 3D magnetic resonance imaging (MRI).
• Fractal geometry analysis on radiographs and ultrasound (US) measurements (velocity, attenuation).
• Mechanical resistance tests and Finite Element Analysis (FEA) for mechanical behavior modeling.

Main Results:

• Fractal geometry analysis on radiographs shows promising results for evaluating trabecular network.
• Ultrasound measurements at the calcaneus or patella can distinguish osteoporosis cases from controls.
• FEA models can predict bone mechanical behavior and reaction to forces.

Conclusions:

• Trabecular bone architecture is a key determinant of bone strength.
• Advanced imaging and analysis techniques offer new avenues for assessing bone health.
• Non-invasive methods like ultrasound show potential for early detection and prediction of bone conditions such as osteoporosis.