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3D histopathological grading of osteochondral tissue using contrast-enhanced micro-computed tomography
H J Nieminen1, H K Gahunia2, K P H Pritzker3
1Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada; Department of Physics, University of Helsinki, Helsinki, Finland; Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland.
Histopathological grading of osteochondral tissue for osteoarthritis research can now be performed using contrast-enhanced microCT (CEmicroCT). This new method overcomes limitations of traditional histology, offering a reliable 3D imaging approach for evaluating osteoarthritis pathology.
Area of Science:
- Biomedical Imaging
- Osteoarthritis Research
- Tissue Engineering
Background:
- Histopathological grading of osteochondral (OC) tissue is crucial for osteoarthritis (OA) research and diagnostics.
- Traditional methods using thin tissue sections have limitations including destructiveness, processing artifacts, loss of 3D structural information, and subjectivity.
- Contrast-enhanced microCT (CEmicroCT) was developed to visualize the collagenous extracellular matrix (ECM) of articular cartilage (AC).
Purpose of the Study:
- To demonstrate the feasibility of histopathological scoring of OC tissue using CEmicroCT.
- To establish a novel, semi-quantitative microCT grading system for OA in OC tissue.
- To overcome the limitations associated with traditional 2D histopathology in OA research.
Main Methods:
- Development and application of contrast-enhanced microCT (CEmicroCT) for visualizing osteochondral tissue.
- Histopathological grading of osteochondral tissue using CEmicroCT images.
- Validation of CEmicroCT findings against traditional histology.
- Establishment of a new semi-quantitative microCT grading system for osteoarthritis.
Main Results:
- Pathological features in articular cartilage (AC) and subchondral bone (SB) were clearly visualized with microCT and verified by histology.
- Excellent intra-class correlation (ICC) of 0.92 was found when comparing CEmicroCT grades with histology-based OARSI grades.
- A new microCT grading system achieved an excellent reader-to-reader ICC of 0.78 for cross-method (microCT vs. histology) assessment.
Conclusions:
- Histopathological information relevant to osteoarthritis can be reliably obtained from CEmicroCT images.
- The developed CEmicroCT grading system offers a feasible and reliable alternative to traditional histology for OA assessment.
- This new grading system can serve as a reference for 3D imaging and analysis techniques for volumetric evaluation of OA pathology in research and clinical settings.
