Magnetic Resonance Imaging in Cartilage Repair Assessment
Summary
Magnetic resonance imaging (MRI) has become the cornerstone for non-invasive evaluation of cartilage repair, combining high-resolution morphological assessment with advanced quantitative techniques to characterise tissue structure and composition. Conventional morphological MRI sequences permit detailed visualisation of surface integrity, defect fill and subchondral bone changes, while quantitative biomarkers such as T2 and T1ρ relaxation times, delayed gadolinium enhancement and diffusion metrics reveal cartilage hydration, collagen orientation and proteoglycan content. Scoring systems, notably the Magnetic Resonance Observation of Cartilage Repair Tissue (MOCART) and Whole-Organ Magnetic Resonance Imaging Score (WORMS), standardise morphological readouts across repair techniques, including microfracture, autologous chondrocyte implantation and osteochondral transplantation. Texture analysis applied to relaxometry maps has further enhanced sensitivity to collagen network organisation, enabling differentiation of repair tissue maturation. Globally, these MRI approaches guide surgical planning, monitor graft integration and predict long-term outcomes by linking imaging biomarkers to clinical performance measures. Integration of morphological and quantitative data supports personalised treatment strategies, facilitates multi-centred trials and accelerates translation of novel biomaterials and cell-based therapies into clinical practice.
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Magnetic Resonance Imaging in Cartilage Repair Assessment publication trend
The graph below shows the total number of articles in magnetic resonance imaging in cartilage repair assessment across all publications each year (not limited to Nature Index journals).
Technical terms
Morphological MRI: Conventional imaging sequences that visualise cartilage surface, defect fill and subchondral bone morphology.
Quantitative MRI: Imaging techniques that measure biophysical properties of cartilage, including relaxation times and diffusion coefficients, to infer tissue composition.
T2 mapping: A quantitative MRI method that assesses collagen integrity and water content by measuring T2 relaxation times voxel-wise.
MOCART 2.0 score: A structured scoring system for evaluating cartilage repair morphology, including defect fill, integration and subchondral changes, with improved reliability.
Bone marrow oedema-like signal (BMELS): Hyperintense areas in subchondral bone on fluid-sensitive sequences, often reflecting mechanical or biochemical stress after repair.
Grey-level co-occurrence matrix (GLCM) texture analysis: A method to quantify spatial relationships of pixel intensities in maps (e.g. T2 maps) to characterise tissue microstructure.
References
- Bone marrow edema-like signal after cartilage repair does not affect outcomes in a five-year follow-up. European Radiology (2024).
- Reliability of the MOCART (Magnetic Resonance Observation of Cartilage Repair Tissue) 2.0 knee score for different cartilage repair techniques—a retrospective observational study. European Radiology (2021).
- Differentiation of Cartilage Repair Techniques Using Texture Analysis from T2 Maps. Cartilage (2021).
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