Measuring Young's modulus of single trabeculae in cancellous bone using a two-point bending test

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Gerontology

Background:

• Surgical treatment of proximal humeral fractures is challenging, particularly in osteoporotic bone.
• Lack of suitable research models and structural data hinders optimization of osteosynthesis.
• Osteoporosis significantly impacts bone quality, affecting fracture healing and surgical outcomes.

Purpose of the Study:

• To determine the microscopic morphology of cancellous bone from human humeral heads.
• To measure the Young's modulus of cancellous bone in osteoporotic human humeral heads.
• To provide essential structural data for developing research models for osteosynthesis.

Main Methods:

• Micro-computed tomography (μCT) for structural analysis of cylindrical bone samples.
• Preparation and mechanical testing of individual trabeculae using a 2-point bending test.
• Axial rotation and stereo microscopy for extracting cross-sectional and moment of inertia data.

Main Results:

• A significant decrease in the ossified portion of cancellous bone with increasing age (p < 0.05).
• Average bone mineralization decreased with age, measuring 1.24 (±0.06) g/mm³.
• The determined Young's modulus of single trabeculae averaged 1.33 (±1.76) GPa.

Conclusions:

• The study identified verified structural parameters indicative of osteoporotic changes in human humeral heads.
• This research provides the first determination of Young's modulus for single trabeculae in osteoporotic human humeral bone.
• Non-destructive sample measurement prior to testing represents a methodological advancement for bone research.