Related Experiment Video
Updated: Mar 15, 2026
05:20
Development of a Rabbit Chronic-Like Rotator Cuff Injury Model for Study of Fibrosis and Muscular Fatty Degeneration
Published on: March 31, 2023
1.9K
Validation of Three-Dimensional Magnetic Resonance Imaging-Based Volumetric Quantification for Fatty Infiltration in
Jieun Kwon1, Hyeon Jang Jeong2, Sheng-Chen Han3
1Department of Orthopaedic Surgery, Ewha Womans University College of Medicine, Ewha Womans University Mokdong Hospital, Seoul 07985, Republic of Korea.
Diagnostics (Basel, Switzerland)
|March 14, 2026
Summary
This study validates a new 3D MRI method for quantifying fatty infiltration in rotator cuff muscles. The advanced technique shows strong correlation with histology, offering a more reliable assessment than traditional grading systems.
Area of Science:
- Orthopedics and Sports Medicine
- Radiology and Imaging
- Biomedical Engineering
Background:
- Fatty infiltration (FI) of rotator cuff (RC) muscles is a key prognostic indicator following surgical repair.
- The current Goutallier-Fuchs grading system for FI lacks consistent reproducibility.
- A validated, objective method is needed to accurately assess RC muscle fatty infiltration.
Purpose of the Study:
- To validate a novel three-dimensional (3D) magnetic resonance imaging (MRI)-based volumetric quantification method for assessing fatty infiltration (FI).
- To compare the accuracy of this 3D MRI method against histologic findings.
- To evaluate the method in a rabbit model of chronic rotator cuff tears (RCT).
Main Methods:
- A chronic rotator cuff tear (RCT) model was established in 18 rabbit shoulders (9 rabbits).
- Shoulders were assigned to repair, chronic tear, or control groups.
- High-resolution 7.0T MRI was used for semi-automated 3D volumetric fat quantification; histologic fat proportion was measured using Oil Red O staining.
Main Results:
- MRI-based and histologic fat proportions were significantly higher in the repair and chronic tear groups compared to controls (p < 0.001).
- Muscle weight and volume were reduced in the chronic tear group compared to controls (p < 0.05).
- A strong positive correlation (r = 0.784, p < 0.001) was found between 3D MRI and histologic measurements of fatty infiltration.
Conclusions:
- The 3D MRI-based volumetric quantification method reliably assesses rotator cuff muscle fatty infiltration.
- Histologic validation confirms the accuracy of this objective imaging approach.
- This method offers a potential improvement over the subjective qualitative grading systems for fatty infiltration.
