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Research ArticleOMERACT 10: 10th International Consensus Conference on Outcome Measures in Rheumatology, Kota Kinabalu, Borneo - May 4–8, 2010

The OMERACT Ultrasound Task Force — Status and Perspectives

ESPERANZA NAREDO, RICHARD J. WAKEFIELD, ANNAMARIA IAGNOCCO, LENE TERSLEV, EMILIO FILIPPUCCI, FREDERIQUE GANDJBAKHCH, PHILIPPE AEGERTER, SIBEL AYDIN, MARINA BACKHAUS, PETER V. BALINT, GEORGE A.W. BRUYN, PAZ COLLADO, STEPHANIE FINZEL, JANE E. FREESTON, MARWIN GUTIERREZ, FREDERICK JOSHUA, SANDRINE JOUSSE-JOULIN, DAVID KANE, HELEN I. KEEN, INGRID MOLLER, PETER MANDL, SARAH OHRNDORF, CARLOS PINEDA, WOLFGANG A. SCHMIDT, MARCIN SZKUDLAREK, PHILIP G. CONAGHAN and MARIA-ANTONIETTA D’AGOSTINO
The Journal of Rheumatology September 2011, 38 (9) 2063-2067; DOI: https://doi.org/10.3899/jrheum.110425
ESPERANZA NAREDO
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RICHARD J. WAKEFIELD
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ANNAMARIA IAGNOCCO
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LENE TERSLEV
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EMILIO FILIPPUCCI
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FREDERIQUE GANDJBAKHCH
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PHILIPPE AEGERTER
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SIBEL AYDIN
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MARINA BACKHAUS
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PETER V. BALINT
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GEORGE A.W. BRUYN
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PAZ COLLADO
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STEPHANIE FINZEL
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JANE E. FREESTON
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MARWIN GUTIERREZ
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FREDERICK JOSHUA
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SANDRINE JOUSSE-JOULIN
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DAVID KANE
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HELEN I. KEEN
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INGRID MOLLER
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PETER MANDL
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SARAH OHRNDORF
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CARLOS PINEDA
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WOLFGANG A. SCHMIDT
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MARCIN SZKUDLAREK
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PHILIP G. CONAGHAN
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MARIA-ANTONIETTA D’AGOSTINO
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  • For correspondence: maria-antonietta.dagostino@apr.ap-hop-paris.fr
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Abstract

This article reports the most recent work of the Outcome Measures in Rheumatology (OMERACT) Ultrasound Task Force, and highlights the future research priorities discussed at the OMERACT 10 meeting. Results of the following studies were presented: (1) intra- and interobserver reliability of ultrasound detecting and scoring synovitis in different joints of patients with rheumatoid arthritis (RA); (2) systematic review of previous ultrasound scoring systems of synovitis in RA; (3) enthesitis systematic review and Delphi definition exercise in spondyloarthritis enthesitis; (4) enthesitis intra- and interobserver reliability exercise; and (5) Delphi definition exercise in hand osteoarthritis, and reliability exercises. Study conclusions were discussed, and a future research agenda was approved, notably further validation of an OMERACT ultrasound global synovitis score (GLOSS) in RA, emphasizing the importance of testing feasibility, predictive value, and added value over standard clinical variables. Future research areas will include validating scoring systems for enthesitis and osteoarthritis, and testing the metric qualities of ultrasound for evaluating tenosynovitis and structural damage in RA.

Key Indexing Terms:
  • ULTRASOUND
  • POWER DOPPLER
  • SYNOVITIS
  • ENTHESITIS
  • STANDARDIZATION
  • OMERACT

Since 2004 an international collaborative group of ultrasound experts known as the OMERACT Ultrasound Task Force has worked to address the metric qualities of ultrasound in rheumatoid arthritis (RA) and other arthritides, according to criteria specified by the OMERACT filter. Despite its widespread use in daily practice, ultrasound has been perceived as an imaging technique that lacks validity1,2,3. In order to address such validity issues, the group has worked on standardizing ultrasound as applied to the most common rheumatic diseases. Over the last 6 years, the research work of the group has mainly focused on the development of a reliable standardized scoring system for synovitis in RA, which combines gray-scale (GS) and power Doppler (PD) in a 0–3 scale that is applicable to all joints and is consistent between machines. We started at OMERACT 7 by presenting results of a general systematic literature, leading to our development of preliminary consensus definitions for ultrasound-defined inflammatory pathology4. The evaluation of the reliability of the technique was considered a priority and subsequently, a number of projects were undertaken to assess the reliability of ultrasound in inflammatory arthritis, but with a particular focus on RA5,6,7.

Results of those exercises highlighted specific problems of standardization of the acquisition and interpretation of ultrasound images. The exercises followed were focused on metacarpophalangeal (MCP) joint synovitis in RA using the OMERACT definition and the same type of ultrasound machine. These iterative projects tested and retested interobserver and intraobserver reliability for both interpretation and acquisition of images of the MCP joint, including a newly introduced semiquantitative scoring at the joint level that combined PD, effusion, and synovial hypertrophy8. Results confirmed that the OMERACT ultrasound definitions and scoring system of synovitis combined with a standardized acquisition protocol provided good intra- and interobserver reliability. This work was presented at OMERACT 89.

The validity of this scoring system at the MCP level was then tested by using different machines and multiple observers. The results varied according to the machine used, and confirmed the good reliability among experts concerning the definitions and the scoring system10. The definition and scoring system of synovitis were also evaluated on other joints commonly involved in RA, including static images of proximal interphalangeal (PIP), wrist, metatarsophalangeal (MTP), and knee joints. Interobserver reliability results ranged from good to excellent for both single pathologies and combined synovitis definitions11. Two reliability studies of the shoulder were also conducted to compare ultrasound with magnetic resonance imaging for the detection of inflammatory and mechanical pathologies and to assess the intra- and interobserver reliability of ultrasound for detecting these lesions. The results were good, but underlined the difficulties for detecting and scoring mechanical-related abnormalities, such as rotator cuff lesions12,13. For finalizing work on RA synovitis the group decided to develop recommendations for detecting and scoring synovitis including the production of an atlas with representative images for different joints (manuscript in preparation).

Finally, through group discussions and feedback sessions, the concept of developing an ultrasound-based global synovitis score in RA (RA GLOSS) was agreed on. This decision was based on the need for integrating the components of synovitis (i.e., synovial hypertrophy, effusion, and synovial Doppler signal) in a unique global score of joint inflammatory activity in RA. This ultrasound scoring system at patient level would permit physicians to objectively follow patients under treatment in clinical and research practice, by using a feasible and economical tool that would be more representative of disease activity in RA patients than conventional clinical measures. In addition, the group decided to focus research on standardization of enthesitis in spondyloarthritis (SpA) and joint-related abnormalities in osteoarthritis (OA).

At OMERACT 10 in Kota Kinabalu, Malaysia, in May 2010, during a Special Interest Group session, the results of activities post-OMERACT 9 were presented and the future research agenda was discussed and endorsed by participants, as follows.

1. Intra- and interobserver reliability of ultrasound detection and scoring of synovitis in different RA joints

The group presented the intra- and interobserver reliability results of an exercise for scoring synovitis in non-MCP RA joints. After a consensus session on a synovitis scoring system at the joint level and training on images, 6 RA patients were scanned by 12 observers (2 rounds). The following joints were included: PIP, wrists, knees, tibiotalar, and MTP joints. Intra- and interobserver reliability for detecting and scoring effusion, synovial hypertrophy, PD signal, and PD ultrasound (PDUS) global synovitis (joint-level) were assessed according to OMERACT rules and usual ultrasound practice using standard κ-coefficient and weighted κ-coefficient with absolute weighting [κ(w)] for semiquantitative grades. According to Landis and Koch14, κ values < 0.40 were considered poor, 0.40–0.60 moderate, 0.60–0.80 good, and 0.80–1 excellent. The results showed a moderate to excellent intraobserver reliability (κ-coefficient range 0.43–0.98) and a moderate to good interobserver reliability (κ-coefficient range 0.49–0.76) for detection of synovitis components (i.e., effusion, synovial hypertrophy, and PD signal) and grading. In addition, intra- and interobserver reliability for both PDUS global synovitis according to OMERACT rules and usual ultrasound clinical practice were good to excellent (κ-coefficient range 0.58–0.86). This demonstrated that OMERACT rules for PDUS scoring of MCP synovitis were valuable for detecting and scoring synovitis in other joints, and they are now implemented in usual ultrasound practice.

2. Ultrasound-based global synovitis score in RA (RA GLOSS)

Moving from joint level to patient level, the group developed an OMERACT ultrasound global synovitis score. For this objective, further evaluation is needed of how many and what joints should be assessed and how to produce a cumulative score. The results of a systematic review in the field of previous ultrasound scoring systems of synovitis in RA were presented (e.g., joint studied, grading used, construct and predictive validity, discrimination, and feasibility) during the Sharp symposium15. The results from 2 published multicenter longitudinal studies were discussed in more detail. The first, from Naredo and colleagues, compared an ultrasound 44-joint count with a number of reduced counts. It concluded that a 12-joint count was feasible and sensitive to change16. The second, from Backhaus and colleagues, proposed a 7-joint synovial recess count17. Both reduced joint counts demonstrated good responsiveness; however, correlation between ultrasound scores and clinical and laboratory findings varied according to the number and size of joints examined. The group agreed that both reduced joint counts required further testing in other multicenter longitudinal studies that also applied the recently devised OMERACT scoring system. For this purpose, a multicenter international study is under way in order to test, first, the sensitivity to change of the OMERACT synovitis scoring system at joint level, and second, to validate a reduced joint count (12 or 7 joints).

During the group discussions and feedback session, a need was expressed to develop the RA GLOSS systems by separating diagnostics from monitoring. For each system, it would be important to know what ultrasound findings and which joints should be assessed. For diagnosis, a large number of joints might need to be assessed, while for monitoring a smaller number is required.

3. Spondyloarthritis-associated enthesitis systematic review and Delphi definition exercise

A number of scoring methods for the peripheral enthesitis in SpA have been described18,19,20,21, with limited data on their psychometric properties. Our group focused on standardization of peripheral enthesitis scores. Preliminary work on standardizing ultrasound enthesitis had already been performed by some members of the group22,23, and this was used as a starting point. A systematic literature review of definition of enthesitis and its component lesions was presented during OMERACT 10. The results showed that most studies used variable definition of enthesitis and its components, making comparison of results difficult. Doppler assessment was included in only a few studies. Reliability, sensitivity, and specificity, and responsiveness were assessed in a minority of studies. A number of enthesitis scoring systems at the patient level have been used but all need consensus and validation. In order to produce a consensual definition of ultrasound enthesitis and elementary components, a Delphi exercise was conducted; the exercise focused on ultrasound elementary lesions and definitions among group members (26 ultrasonographers). The Delphi questionnaire included 4 main areas: (1) Definition of normal ultrasound enthesis and other anatomical structures; (2) Which lesions in GS and PD to include; (3) Ultrasound definition of elementary lesions; and (4) Which lesions reflect inflammation and damage. There was high agreement (> 80%) for definitions of normal enthesis and normal bursa and for separating both. There was also high agreement for assessing the following ultrasound elementary lesions: hypoechogenicity and increased thickness of tendon insertion, enthesophytes, calcifications, erosions, and Doppler signal at enthesis insertion.

The number of entheses to evaluate was discussed but it was suggested that we should evaluate 6 bilateral areas. These included quadriceps insertion, patellar tendon (proximal and distal), Achilles tendon, plantar fascia, and lateral epicondyle. In terms of scoring systems, agreement was obtained to develop one for diagnostic purposes and one for monitoring.

4. Preliminary results of an enthesitis intra- and interobserver reliability exercise in SpA patients

The group presented the intra- and interobserver reliability results of an exercise for detecting elementary components of enthesitis in SpA patients. Prior to this exercise, a consensus session on which lesions and sites to include and a training session on images were conducted. Six SpA patients were scanned by 12 observers (2 rounds). The assessed elementary components were as follows: cortical erosions, enthesophytes, increased thickness, hypoechogenicity, PD at cortical insertion, PD outside insertion, bursitis, and calcifications. The following bilateral sites were assessed for the presence of the above components and global enthesitis: epicondyle, Achilles tendon, and patellar ligament (both insertions). Intra- and interobserver reliability for detecting the above components were assessed using standard κ-coefficient and weighted κ-coefficient, with absolute weighting [κ(w)] for semiquantitative grades14. The results showed a variable intra- and interobserver reliability for detecting the elementary components (better for PD than for GS). However, enthesitis as global definition was more reliable than single components (interobserver κ-coefficient, 0.67; intraobserver κ-coefficient range 0.45–0.80).

The results of an additional Web-based intra- and inter-reader reliability exercise on ultrasound detection of SpA enthesitis were also presented. We tested the elementary components and the definition of enthesitis in a large group of sonographers (18 participants, 120 ultrasound images). The results were variable but comparable to the reliability exercise in patients (interobserver κ-coefficient, 0.61; intraobserver κ-coefficient range 0.20–0.70).

5. Preliminary results of a Delphi definition exercise in hand OA and subsequent reliability exercise

The ultrasound group had previously decided to focus on standardization of joint-related pathologies in OA. After a systematic review of the literature24, an OMERACT/OARSI US sub-task force focused on hand OA. A Delphi exercise focusing on ultrasound elementary lesions and definitions in OA was conducted among group members (21 sonographers). The Delphi process aimed at reaching consensus on ultrasound elementary lesions, definitions, and ultrasound scanning technique. The results showed high to good agreement (> 80%) for evaluating cartilage, osteophytes, bone erosions, cortical irregularities, synovial membrane, and synovial fluid. It was suggested to differentiate ultrasound inflammation and structural damage.

The group undertook 2 reliability exercises in patients with early and late hand OA. There was a high variability in the detection of all elementary lesions in the former exercise, with moderate improvement in detection of some structural damage lesions in the second exercise. The results of these exercises highlighted specific problems of interpretation of cartilage lesions and cortical abnormalities.

FUTURE ACTIVITIES

Rheumatoid Arthritis; Synovitis

A multicenter international study is currently under way that aims to test the responsiveness of the composite RA OMERACT synovitis scoring system (GS + PD) as applied to different core sets of joints. In addition, group work has begun to focus on the use of ultrasound for evaluating tenosynovitis and structural damage (i.e., bone erosions and tendon damage) in RA. Testing the added value, predictive value in relation to disease-centered (e.g., erosions), and patient-centered (e.g., function) outcomes, as well as the diagnostic value of ultrasound in clinical trials, is a priority objective. Future research directions also include further validation of global ultrasound scoring of synovitis at the patient level for diagnostic purposes and for monitoring in RA.

Spondyloarthritis Enthesitis

After reaching consensus on preliminary selection and definition of the elementary lesions that should be evaluated in peripheral SpA enthesitis, the group is investigating scoring systems at joint level and at patient level with differentiation of elementary lesions useful for activity assessment and damage assessment. The group is also planning further research on the development of reliable and feasible scoring systems for early diagnosis and monitoring of SpA.

Osteoarthritis

Agreement on OA lesions using an image-based Web exercise is being pursued in order to improve ultrasound reliability. The group is also testing the reliability of ultrasound detection and grading of tenosynovitis in RA. The development of a global ultrasound scoring system to use in a longitudinal observational study in early hand and knee OA is also on the agenda.

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    1. Keen HI,
    2. Wakefield RJ,
    3. Conaghan PG
    . A systematic review of ultrasonography in osteoarthritis. Ann Rheum Dis 2009;68:611–9.
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The Journal of Rheumatology
Vol. 38, Issue 9
1 Sep 2011
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The OMERACT Ultrasound Task Force — Status and Perspectives
ESPERANZA NAREDO, RICHARD J. WAKEFIELD, ANNAMARIA IAGNOCCO, LENE TERSLEV, EMILIO FILIPPUCCI, FREDERIQUE GANDJBAKHCH, PHILIPPE AEGERTER, SIBEL AYDIN, MARINA BACKHAUS, PETER V. BALINT, GEORGE A.W. BRUYN, PAZ COLLADO, STEPHANIE FINZEL, JANE E. FREESTON, MARWIN GUTIERREZ, FREDERICK JOSHUA, SANDRINE JOUSSE-JOULIN, DAVID KANE, HELEN I. KEEN, INGRID MOLLER, PETER MANDL, SARAH OHRNDORF, CARLOS PINEDA, WOLFGANG A. SCHMIDT, MARCIN SZKUDLAREK, PHILIP G. CONAGHAN, MARIA-ANTONIETTA D’AGOSTINO
The Journal of Rheumatology Sep 2011, 38 (9) 2063-2067; DOI: 10.3899/jrheum.110425

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The OMERACT Ultrasound Task Force — Status and Perspectives
ESPERANZA NAREDO, RICHARD J. WAKEFIELD, ANNAMARIA IAGNOCCO, LENE TERSLEV, EMILIO FILIPPUCCI, FREDERIQUE GANDJBAKHCH, PHILIPPE AEGERTER, SIBEL AYDIN, MARINA BACKHAUS, PETER V. BALINT, GEORGE A.W. BRUYN, PAZ COLLADO, STEPHANIE FINZEL, JANE E. FREESTON, MARWIN GUTIERREZ, FREDERICK JOSHUA, SANDRINE JOUSSE-JOULIN, DAVID KANE, HELEN I. KEEN, INGRID MOLLER, PETER MANDL, SARAH OHRNDORF, CARLOS PINEDA, WOLFGANG A. SCHMIDT, MARCIN SZKUDLAREK, PHILIP G. CONAGHAN, MARIA-ANTONIETTA D’AGOSTINO
The Journal of Rheumatology Sep 2011, 38 (9) 2063-2067; DOI: 10.3899/jrheum.110425
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