Atlas for the OMERACT thumb base osteoarthritis MRI scoring system (TOMS)

Area of Science:

• Rheumatology
• Radiology
• Medical Imaging

Background:

• Thumb base osteoarthritis is a common condition affecting hand function.
• Standardized MRI assessment is crucial for clinical trials in osteoarthritis.
• The Outcome Measures in Rheumatology Clinical Trials (OMERACT) group develops standardized outcome measures.

Purpose of the Study:

• To present an atlas for the OMERACT thumb base osteoarthritis MRI scoring system (TOMS).
• To provide standardized reference images for grading key features of thumb base osteoarthritis on MRI.
• To facilitate consistent and reliable MRI scoring in patients with hand osteoarthritis.

Main Methods:

• Development of a reference atlas with images for each grade (0-3) of TOMS features.
• Inclusion of features such as synovitis, bone defects, osteophytes, cartilage, and subluxation.
• Focus on the first carpometacarpal and scapho-trapezio-trapezoid joints.

Main Results:

• The atlas contains reference images for all TOMS features and grades.
• Images cover specific joints relevant to thumb base osteoarthritis.
• The atlas serves as a guide for scoring thumb base MRIs.

Conclusions:

• The OMERACT TOMS MRI atlas provides a standardized tool for assessing thumb base osteoarthritis.
• This atlas will enhance the reliability and consistency of MRI evaluations in research and clinical practice.
• It supports the accurate scoring of hand osteoarthritis using the TOMS system.