Strain measurement of pure titanium covered with soft tissue using X-ray diffraction

Area of Science:

• Biomaterials Science
• Materials Science
• Medical Imaging

Background:

• Accurate measurement of stress and strain in biomedical implants is crucial for predicting fracture and assessing implant integration with bone.
• X-ray diffraction (XRD) is a viable technique for measuring strain in titanium (Ti) materials.

Purpose of the Study:

• To investigate the feasibility of using XRD to measure strain in titanium implants covered by biological tissues.
• To evaluate the effects of skin tissue and physiological saline on X-ray diffraction measurements.

Main Methods:

• Applied X-ray diffraction using Mo Kalpha characteristic X-rays to skin tissue-covered titanium specimens.
• Investigated X-ray absorption and scattering effects caused by 1 mm of skin tissue.
• Conducted strain measurements under bending loads using a parallel beam arrangement.

Main Results:

• Skin tissue caused X-ray absorption and scattering from physiological saline, creating a background pattern in the diffraction profile.
• Despite tissue interference, distinct diffraction peaks for titanium (010, 002, 011, 110) were clearly identified.
• Strain measurements of the (110) lattice planes showed minimal difference with or without the skin tissue cover.

Conclusions:

• Mo Kalpha X-ray diffraction can successfully measure the strain of titanium implants beneath intact skin tissue.
• The technique holds potential for in vivo monitoring of implant strain and adaptation.