Elastic Modulus of Osteoporotic Mouse Femur Based on Femoral Head Compression Test

Area of Science:

• Biomechanical testing
• Bone research
• Osteoporosis evaluation

Background:

• Biomechanical tests evaluate bone structural and pathological differences, including osteoporosis and fractures.
• Femoral head compression tests are crucial for assessing osteoporosis in the femoral neck.
• In vivo microcomputed tomography (micro-CT) enables longitudinal bone mineral density analysis.

Purpose of the Study:

• To analyze bone mineral density changes over time in an osteoporosis model.
• To determine the elastic modulus of the femur in normal and osteoporotic groups using finite element analysis (FEA) based on femoral head compression tests.
• To compare biomechanical properties between normal (CON) and osteoporotic (OVX) groups.

Main Methods:

• In vivo microcomputed tomography (micro-CT) for bone mineral density assessment.
• Femoral head compression testing to gather biomechanical data.
• Finite element analysis (FEA) to derive elastic modulus from compression test data.

Main Results:

• The osteoporotic (OVX) group exhibited significantly lower ultimate and yield loads compared to the normal (CON) group.
• Bone mineral density changes due to osteoporosis were more pronounced in the proximal femur than the diaphysis.
• FEA-derived elastic modulus showed no significant difference between the CON and OVX groups.

Conclusions:

• Femoral head compression tests effectively demonstrate reduced bone strength in osteoporosis.
• Despite decreased bone strength, the elastic modulus of the femur may not significantly change in this osteoporosis model.
• Osteoporosis impacts bone mineral density and structural integrity, particularly in the proximal femur.