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Biomechanics Overview   Torsion   Bending   Compression   Fracture  

Torsion tests are performed to measure the shear properties of the cortical bone of long bones or cores samples of cancellous bone from the femoral head. The ends of the bone are fixed within a custom-built torsion device and a torque is applied one end of the bone with a servomotor. The resulting rotation of the bone shaft is measured using a rotational linear voltage displacement transformer (LVDT) and the applied torque is measured with a torque-cell. The test is typically conducted until the torque is great enough that the bone's integrity is compromised and it shatters.


From the information obtained from this test, the maiximum shear stress, torsional stiffness (rigidity), shear modulus (elasticity) and maximum shear strain of the bone can be calculated.