Ami Ben-Artzi , Gurjit S. Kaeley and Veena K. Ranganath
Ultrasound Scoring of Joint Synovitis
Objective Quantification of Articular Inflammation
1st ed. 2021
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Ami Ben-Artzi
Cedars-Sinai Medical Center, Beverly Hills, CA, USA
Gurjit S. Kaeley
College of Medicine, University of Florida, Jacksonville, FL, USA
Veena K. Ranganath
Ronald Reagan UCLA Medical Center, Los Angeles, CA, USA
ISBN 978-3-030-43271-3 e-ISBN 978-3-030-43272-0
https://doi.org/10.1007/978-3-030-43272-0
Springer Nature Switzerland AG 2021
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Synovitis Atlas
Dear Atlas User,
We began work on this atlas in 2014, describing the LAJAX US-34 (pronounced Lay-Jax, based on Los Angeles - Jacksonville) scoring methodology. While contemporary synovitis atlases are impressive, and continue to make valuable contributions to musculoskeletal ultrasound applications in rheumatology, we found they have some limitations, especially when applied to clinical trials.
We introduce this atlas, to complement the existing body of synovitis atlases, and address some specific challenges presented when they are applied to a multi-center clinical trial using ultrasound findings as an outcome measure. We began with the widely accepted semiquantitative scale of scoring for grayscale synovitis (03) and Doppler signal (03), but then defined the grades using more objective terms than our contemporaries. Recent publications have found that Doppler signal has much more profound clinical implications than grayscale synovitis. For this reason, the proposed atlas has a novel approach to the grading of synovitis: grayscale synovitis is not seen as an important variable on its own, it only serves to define the region where Doppler signal can be interpreted. This atlas is unique in its focus on the Doppler signal interpretation. The new grade definitions aim to accomplish three goals:
Reduce intra-observer variability in Doppler signal interpretation
Reduce inter-observer variability in Doppler signal interpretation
Increase sensitivity to change in Doppler signal over time
To achieve these aims, this atlas compromises on two fronts:
The proposed grading of grayscale synovitis is not always clinically relevant or accurate. But, it serves to outline the region where Doppler signal is interpreted.
To attain a more reproducible, objective grading system, in certain situations, the atlas will compromise on the clinical relevance of the Doppler signal grading.
While the proposed grading system can be applied to clinical practice, it is designed to perform in multi-center clinical trials that seek to detect change in intra-articular Doppler signal over time. This contribution can complement the synovitis atlas publications currently available.