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.

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.

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