# Towards MRI Study of Biointegration of Carbon-Carbon Composites with Ca-P Coatings

## TL;DR

This study explores how MRI can track how carbon-carbon composites integrate into mouse tissue, with and without coatings.

## Contribution

The paper introduces MRI criteria to non-invasively assess biointegration of C-C composites in vivo.

## Key findings

- MRI scans showed increased volume of connective tissue capsules around implants at 6 and 12 weeks.
- Coated implants showed distinct tissue capsule characteristics compared to uncoated ones.
- MRI criteria successfully differentiated loose and dense connective tissue around implants.

## Abstract

The development of specific MRI criteria to monitor the implantation process may provide valuable information of individual tissue response. Using MRI and histological methods, the biointegration of carbon-carbon (C-C) composites into the subcutaneous tissues of BDF1 mice and their biocompatibility were investigated. The study focused on autopsy specimens containing C-C composite implants, both uncoated and coated with synthetic hydroxyapatite (Ca-P) via electrodeposition or detonation techniques, assessed at 6 and 12 weeks post-implantation. The results revealed that the radiological characteristics of the connective tissue capsule surrounding the implants allowed for the differentiation between loose and dense connective tissues. Fat-suppressed T1-weighted MRI scans showed that the volume of both loose and dense connective tissue in the capsule increased proportionally at 6 and 12 weeks, with distinct ratios observed between the coated and uncoated specimens. The proposed MRI criteria provided a strategy for evaluating the density and homogeneity of the connective tissue capsule. This approach could be valuable for further non-invasive in vivo studies on implant biointegration.