Developing a magnetic resonance imaging scoring system for peripheral psoriatic arthritis

Area of Science:

• Rheumatology
• Radiology
• Medical Imaging

Background:

• Psoriatic arthritis (PsA) is a chronic inflammatory disease affecting joints and entheses.
• Accurate assessment of PsA activity is crucial for patient management.
• Standardized imaging scoring systems are needed for objective evaluation.

Purpose of the Study:

• To describe the initial development of an Outcome Measures in Rheumatology (OMERACT) magnetic resonance imaging (MRI) scoring system for peripheral PsA.
• To assess inter-reader reliability for various MRI features of PsA.

Main Methods:

• Utilized a preexisting MRI dataset of finger joints from 10 PsA patients.
• Four readers scored specific features: bone erosion, bone edema, synovitis, tendinopathy, and extracapsular inflammation (including enthesitis).
• Scoring was performed according to predefined criteria.

Main Results:

• Inter-reader reliability was moderate to high for bone edema and erosion.
• Reliability was lower for soft tissue inflammation, including synovitis, tendinopathy, and enthesitis.
• Identified areas for improvement in future scoring system development.

Conclusions:

• The initial steps in developing an OMERACT MRI scoring system for peripheral PsA show promise.
• Further refinement is needed to improve reliability for soft tissue inflammation assessment.
• Future work will focus on enhancing definitions and reader calibration to improve scoring consistency.