Combining Electrostimulation with Impedance Sensing to Promote and Track Osteogenesis within a Titanium Implant

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Biomedical Engineering

Background:

• Electrical stimulation shows promise for enhancing bone fracture healing.
• Current methods lack real-time monitoring of osteogenesis during electrical stimulation.
• A combined approach using titanium implants and impedance sensing is proposed.

Purpose of the Study:

• To develop a method for real-time monitoring of osteogenesis during electrical stimulation for bone healing.
• To integrate electrical stimulation and impedance sensing on a titanium implant.
• To enable personalized adjustment of electrical stimulation parameters based on individual fracture healing progress.

Main Methods:

• Osteogenic differentiation was monitored using electric cell-substrate impedance sensing (ECIS) on a titanium implant.
• Cells were subjected to continuous or pulsatile electrical stimulation (0.7 V AC/20 Hz) for at least seven days.
• Impedance parameter Alpha (α) was remodeled to differentiate proliferation from osteogenic events.

Main Results:

• A novel impedance parameter, Alpha (α), was identified to track osteogenic differentiation.
• Pulsatile electrical stimulation led to an increase in α-values over time.
• Increased α-values correlated with known morphological changes indicative of osteogenesis.

Conclusions:

• This study provides a foundation for a dual-function fracture therapy device.
• The device can both induce osteogenesis and monitor its progress in real-time.
• This enables adaptive electrical stimulation for optimized fracture healing.