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Updated: Jun 23, 2026
06:31
Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography
Published on: October 6, 2023
The development of EERA: software for assessing rheumatic joint erosions
Patrick D Emond1, Abram Choi, John O'Neill
1St Joseph's Hospital, McMaster University, Hamilton, Ontario, Canada. edmondpd@mcmaster.ca
Summary
A new software program enhances the accuracy of scoring bone erosions in metacarpophalangeal joints, improving reliability for less experienced readers in rheumatoid arthritis assessments.
Area of Science:
- Rheumatology
- Medical Imaging
- Orthopedics
Background:
- Rheumatoid arthritis (RA) commonly affects the metacarpophalangeal (MCP) joints.
- Accurate assessment of bone erosions in RA is crucial for monitoring disease progression and treatment efficacy.
- Current manual scoring methods can suffer from inter-reader variability, especially among less experienced clinicians.
Purpose of the Study:
- To develop a segmentation program for defining bones in dynamic 3D images of the MCP joint.
- To improve inter-reader agreement for bone erosion scores among non-musculoskeletal or junior fellows.
- To enhance the reliability of rheumatoid arthritis magnetic resonance imaging (RAMRIS) scoring.
Main Methods:
- A custom segmentation program was developed to process 2D magnetic resonance (MR) images of the MCP joints.
- Fifteen participants' second to fifth metacarpal heads and phalangeal bases were assessed.
- Two readers, one trained and one untrained, scored the images using the RAMRIS system, with the untrained reader utilizing the segmentation software in the second comparison.
Main Results:
- The segmentation software demonstrated a marginal increase in inter-reader reliability for MCP joint bone erosion scoring.
- A substantial increase in reliability was observed specifically for the second metacarpal head.
- Future research directions include improving image acquisition and erosion delineation techniques.
Conclusions:
- Software utilizing dynamic 3D imaging aids in standardizing MCP joint erosion scoring.
- Relatively untrained users can achieve expert-level scoring accuracy for MCP joint erosions with this software.
- This tool has the potential to improve diagnostic consistency in RA management.
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