A Non-Invasive Method for Monitoring Osteogenesis and Osseointegration Using Near-Infrared Fluorescent Imaging: A...

Area of Science:

• Biomedical Engineering
• Materials Science
• Medical Imaging

Background:

• Conventional imaging techniques like CT and X-ray radiography produce metal artifacts around implants.
• These artifacts can lead to misdiagnoses of bone maturation and peri-implantitis.
• Developing methods to mitigate these artifacts is crucial for accurate implant assessment.

Purpose of the Study:

• To develop and evaluate a novel near-infrared fluorescence (NIRF) molecular imaging system.
• To address the challenge of metal artifacts in imaging bone maturation around implants.
• To monitor osteogenesis and bone formation around orthopedic implants with high specificity.

Main Methods:

• Design of a specific nanoprobe, osteogenic biomarker, and nano-Au-Pamidronate.
• Implantation of titanium alloy screws in Sprague Dawley rats (n=12) across three groups: X-ray/CT, NIRF, and sham.
• Acquisition of X-ray, CT, and NIRF images 28 days post-implantation.

Main Results:

• X-ray imaging revealed metal artifacts at the implant-bone interface, despite tight tissue surrounding the implant.
• NIRF imaging showed a distinct fluorescence signal around the implant site, correlating with histological findings.
• The NIRF system effectively identified image loss caused by metal artifacts.

Conclusions:

• The novel NIRF molecular imaging system accurately detects image loss due to metal artifacts.
• This system is applicable for monitoring bone maturation around orthopedic implants.
• It offers a new approach for evaluating implant osseointegration and assessing novel implant materials or surface treatments.