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The aim of our study was to describe the distinct features of inflammatory bowel disease (IBD) in juvenile idiopathic arthritis (JIA) patients and to identify risk factors for its development.Data from the German biologics in paediatric rheumatology registry (Biologika in der Kinderrheumatologie (BiKeR)) collected between 2001 to 2021 were analysed retrospectively.In 5009 JIA patients, 28 developed confirmed IBD before the age of 18 years: 23 (82.1%) with Crohn's disease (CD), 4 (14.3%) with ulcerative colitis (UC) and 1 (3.6%) with IBD-unclassified. The incident rate of IBD during 20 years of observation was 0.56% (0.46% for CD, 0.08% for UC, 0.02% for IBD-U), of whom 20.3% were HLA-B27 positive, 25% had enthesitis-related arthritis and 14.3% psoriatic arthritis. Within 90 days before IBD diagnosis, 82.1% (n=23) received treatment with etanercept (ETA), 39.3% (n=11) NSAID, 17.9% (n=5) systemic corticosteroids, 8 (28.6%) methotrexate (MTX), 14.3% (n=4) sulfasalazine, 10.7% (n=3) leflunomide, and 3.6% (n=1) adalimumab and infliximab, respectively. The incidence of IBD was lower in patients treated with MTX, but higher in patients treated with ETA except if ETA was combined with MTX. Also in patients on leflunomide or sulfasalazine, the IBD incidence was higher.In our JIA cohort, an increased IBD incidence is observed compared to the general population, and the ratio of CD to UC is markedly higher hinting at a distinct phenotype of IBD. Pre-treatment with MTX seems to be protective. Treatment with ETA does not prevent IBD development and JIA patients treated with leflunomide and sulfasalazine may be at an increased risk for IBD development.An infographic is available for this article at: http://links.lww.com/MPG/C985.

ZusammenfassungDer Artikel gibt einen Überblick zum aktuellen Stand der Ultraschallbefundung in der Kinderrheumatologie und geht insbesondere auf den praktischen Einsatz und die technischen Aspekte der Gelenksonografie ein. Dabei werden auch die wissenschaftlichen Entwicklungen der letzten Jahre zusammengefasst und berücksichtigt. Neben der Gelenksonografie wird die Ultraschalltechnik in der Kinderrheumatologie zunehmend auch auf weitere Körperregionen und -organe ausgeweitet, die für die kinderrheumatologische Diagnostik relevant sind.

ZusammenfassungSchmerzhafte Bewegungseinschränkungen und Gelenkschwellungen, der Nachweis von entzündlichen Veränderungen in der Sonografie oder Kernspintomografie sowie unauffällige laborchemische Untersuchungen sind typische Befunde der juvenilen idiopathischen Arthritis. Allerdings müssen in der differenzialdiagnostischen Abklärung von Arthropathien auch sehr seltene, nicht entzündliche hereditäre Skelettdysplasien in Betracht gezogen werden. Wir berichten über 3 Patienten aus 2 Familien mit einer multiplen epiphysären Dysplasie Typ 4 (MED4). Zwei der Patienten wurden unter dem Verdacht auf ein primär entzündliches Geschehen zunächst antiinflammatorisch behandelt. Die entzündlichen Veränderungen stellten sich jedoch als sekundär, infolge einer bereits fortgeschrittenen Osteoarthrose, heraus. Exemplarisch werden weitere, primär nicht entzündliche Skelettdysplasien vorgestellt, welche sich im Kindes- und Jugendalter manifestieren und mit einem initial normalen Längenwachstum, unauffälligen Körperproportionen, einer unauffälligen Facies sowie einer normalen kognitiven Entwicklung einhergehen.

To evaluate healthcare services for patients with juvenile idiopathic arthritis (JIA) from the parent-proxy perspective and to identify factors associated with perceived deficits in care.Patients with JIA from 11 paediatric rheumatology units were enrolled in an inception cohort within the first 12 months after diagnosis. Healthcare services were assessed using The Child Healthcare Questionnaire on satisfaction, utilisation and needs. Factors associated with deficits in care were identified by logistic regression analysis.Data from parents of 835 JIA-patients were included in the analysis. At the assessment (4.7 months after diagnosis), 85% of the patients received drug treatment, and 50% had received multi-professional care. The most frequently used services were physiotherapy (84%), occupational therapy (23%), and telephone counselling (17%). Almost one-third of families reported that they had not received the services that they needed, with health education being the most frequently reported need. Most parents (93%) were satisfied with the overall healthcare provided for their children, especially regarding doctors' behaviour. However, approximately 1 in 3 consumers were dissatisfied with the time to JIA diagnosis and the school services. The lower the child's quality of life, the higher the chance was that the child and the family received multi-professional care, perceived unmet needs, and were dissatisfied with care.According to parents' experience and satisfaction with their child's care, performance at the system level can be further improved by diagnosing JIA earlier, providing additional information at disease onset, and ensuring that the child's social environment is taken into account.

Objective Analysis of etanercept biosimilars in pediatric patients with juvenile idiopathic arthritis (JIA) in comparison with the etanercept originator in terms of efficacy and safety. Methods Patients diagnosed with JIA who started treatment with either the etanercept originator or a biosimilar after January 1, 2017, were selected from the German BIKER registry (Biologics in Paediatric Rheumatology Registry). Furthermore, patients who started therapy with the originator and switched to a biosimilar during the course of therapy were identified. For both patient groups, disease activity and safety were examined and compared separately. Results After January 1, 2017, 348 patients started treatment with the etanercept originator (n = 293) or a biosimilar (n = 55). Another 57 patients switched to a biosimilar during the course of therapy. A significant decrease or a stable remission of disease activity was observed in both patient groups. The safety profiles were comparable, and frequencies and types of adverse events (AEs) and serious AEs were similar in patients starting therapy with the originator or a biosimilar. Only injection site reactions occurred slightly more frequently under biosimilar therapy, without having an impact on therapy adherence. In patients who switched therapy, the AE rate per 100 patient-years was comparable before (26.4) and after (32.1) the switch. Conclusion In patients with JIA who require treatment with etanercept, the originator is still used much more frequently. However, our study highlights the equivalence of etanercept biosimilars for therapy for JIA. Increased use of these biosimilars in pediatric patients can therefore be recommended without hesitation.

Auf dem Strategiemeeting im September 2020 wurde vom Vorstand und Beirat der Gesellschaft für Kinder- und Jugendrheumatologie (GKJR) vorgeschlagen, regelmäßig über die Arbeit in den Kommissionen und Arbeitskreisen zu berichten. Im Jahr 2021 erschienen in den Verbandsnachrichten Beiträge der Kommission Sport und Bewegung (Heft 1), der Kommission Pharmakotherapie und Leitlinien (Heft 2) und der Kommission Patientenschulung (Heft 3). Mit dem Bericht der Kommission Qualitätssicherung und Versorgung wird die Reihe nun wieder aufgenommen.

In unserem Artikel werden aktuelle Bedeutung und Entwicklung der Gelenksonografie als fester Bestandteil eines „Treat-to-Target“-Konzeptes bei der Behandlung der juvenilen idiopathischen Arthritis (JIA) dargestellt und diskutiert. Dabei nimmt die Gelenksonografie neben der klinischen Untersuchung eine entscheidende Rolle in der fruhen Diagnosestellung einer JIA ein mit dem Ziel, dem Patienten so fruh wie moglich eine effiziente Therapie zukommen zu lassen (Window of Opportunity). Zusatzlich kann die Gelenksonografie, eingebettet in das „Treat-to-Target“-Konzept, eine wichtige Rolle in der Verlaufskontrolle und Evaluation einer subklinischen Entzundungsaktivitat spielen. Bisherige etablierte Diagnose-, Verlaufs- und auch Remissionskriterien einer JIA lassen stringente und objektivierbare bildgebende Kriterien vermissen, obwohl sich Qualitat und Erfahrung bei der Gelenksonografie stetig verbessern. Neben den sonografischen Kriterien haben sich inzwischen auch verschiedene Biomarker zur Beurteilung der Krankheitsaktivitat etabliert. Mit der Entwicklung der Sonografie und sicheren Testung von Biomarkern konnte sich in Zukunft zur fruhen Diagnosestellung und sicheren Remissionseinschatzung eine Kombination aus immunologischen und sonografischen Kriterien etablieren, die das bisherige „Treat-to-Target“-Konzept bei der JIA unterstutzen und verbessern. In this article the current role and development of musculoskeletal ultrasound as a central component of treat-to-target management of JIA is discussed. Musculoskeletal ultrasound alongside clinical examination plays a significant role in the early diagnosis of JIA, with the aim of initiating treatment as soon as possible and within the “window of opportunity”. Including ultrasound in treat-to-target strategies could play an important role in the monitoring and evaluation of clinical as well as subclinical inflammation. However, despite continuous improvements in the quality and experience of ultrasound capabilities, existing diagnostic, prognostic and remission criteria are still lacking objective imaging-specific criteria. Other than ultrasound, immunological biomarkers have also shown utility for the evaluation of clinical activity. The development of ultrasound and routine testing of biomarkers, and potentially both combined, could allow earlier diagnosis and more accurate prediction of disease remission, thereby supporting and improving the ability to treat JIA to target.

Objective To investigate the impact of additionally given MTX on biologic treatment of polyarticular JIA in terms of effectiveness, safety and drug survival. Methods Patients suffering from polyarticular JIA and treated with either monotherapy with a first biologic or a combination of a biologic and MTX were selected from the BIKER registry. The TNF-α inhibitors (TNFi) adalimumab, etanercept and golimumab and the IL-6 inhibitor tocilizumab were considered. Upon a non-randomized study design, we adjusted the different cohorts using propensity score matching to improve comparability. Results A total of 2148 patients entered the analysis, who were treated by either combination therapy (n = 1464) or monotherapy (n = 684). Disease activity declined significantly more in patients upon combination therapy than upon biologic monotherapy. Comparison of adjusted cohorts revealed that patients who received TNFi gained more benefit from additionally given MTX than patients treated with tocilizumab. Median survival time of therapy with biologics was significantly longer upon combination therapy (3.1 years) than with monotherapy (2.7 years), as demonstrated by a Kaplan–Meier analysis (log rank test: P = 0.002). The safety profile was moderately affected by additional MTX due to increased incidence of gastrointestinal and hepatic adverse events. Serious adverse events occurred at an equal rate of 3.6 events per 100 patient-years in both cohorts. Conclusion Additionally given MTX improves the effectiveness of biologic treatment in polyarticular JIA without seriously compromising treatment safety. Especially TNFi benefit from combination, while no improvement in outcome has been observed by combining tocilizumab with MTX.

BackgroundDespite the worldwide increasing request of education on paediatric musculoskeletal ultrasound (PedMSUS), content, conduct and format of PedMSUS courses have never been internationally agreed.ObjectivesTo produce educational procedures for the conduct, content and format of EULAR/PReS PedMSUS courses.MethodsAfter a systemic literature review and expert opinion collection, a panel of items for the development of procedures on PedMSUS courses was identified. Agreement on the items was assessed through Delphi surveys among a taskforce of 24 members, which included 18 experts in PedMSUS (8 rheumatologists, 1 radiologist, 9 paediatric rheumatologists), 1 methodologist and rheumatologist expert in MSUS, 2 patient research partners, 1 health professional in rheumatology and 2 EMEUNET/EMERGE members, from 8 different European countries. Each item was assessed through a 5-point Likert scale (0, full disagreement; 5, full agreement); agreement was reached for >75% of answers rating 4–5. All items with agreement were included in the preliminary core set of educational procedures, which underwent external assessment by a broader Consensus group (Faculty and Tutors of previous EULAR PedMSUS courses and PReS Imaging Working Party members), through Delphi survey.ResultsTwo Delphi surveys produced the preliminary core set of procedures for basic, intermediate, advanced and teach-the-teachers (TTT) PedMSUS courses. A Delphi survey within the Consensus group produced agreement on the proposed procedures.ConclusionsShared EULAR/PReS procedures for the conduct, content and format of basic, intermediate, advanced and TTT PedMSUS courses were identified on international basis.

This article reviews the role of musculoskeletal ultrasound (MSUS) for the diagnosis, monitoring and treat-to-target management of JIA. Technological advancements in MSUS allow more precise evaluation of arthritis, tenosynovitis and enthesitis versus clinical examination alone, which may assist treatment decisions. In adult studies, serum and synovial biomarkers have correlated with MSUS findings. Within paediatric rheumatology, significant developments in the definition of normal and pathology, a necessity for the future integration of MSUS into treat-to-target management, have already been reached or are underway, which in turn could allow tighter control of disease activity and earlier identification of treatment response and failure, bringing the goal of ‘precision medicine’ closer. Additionally, the utility of MSUS for the evaluation of subclinical disease remains an unexamined area of interest. ‘Ultrasound remission’ combined with clinical assessment and immunological markers could therefore potentially improve the treat-to-target management of JIA.

Der Einsatz bildgebender Methoden hat in der Kinderrheumatologie in den vergangenen 15 Jahren deutlich zugenommen. Heute kann man mit sensitiven bildgebenden Methoden erganzend zur physikalischen Untersuchung das Fruhstadium einer kindlich rheumatischen Erkrankung erfassen.

Background Defining of gray scale ultrasound standard reference values of the shoulder joint in childhood and adolescence during maturation. Patients: We examined 445 healthy girls and boys between 1 year and 18 years of age. Method A cross-sectional multicentre grey-scale ultrasound study was performed to examine the shoulder joint on both sides. The children were divided according to their gender and were further classified into six age groups, which constituted three-year age ranges, to record anatomical development changes. We measured the capsule-bone distance (BCD) as a representation of the intracapsular cavity, as well as the thickness of the joint capsule and joint cartilage. Values were expressed in mean±standard deviation (SD) and minimum-maximum (min-max). The shape of the joint capsule and capsule-bone junction zone was qualitatively analysed. Results The joint cartilage thickness decreased with increasing age in all joints independently from sex and body side. However, the BCD and the capsule thickness increased with age. There was no intraarticular fluid visible. The joint capsule had a predominantly concave form, whereas the capsule-bone junction was mostly sharp. Discussion This study is the first describing age-related normal values of the intracapsular cavity, joint capsule and cartilage thickness as well as their respective shape in a large cohort of healthy children. Conclusion The findings could be helpful to differentiate between physiological and pathological joint conditions and thereby distinguishing age-related variations from alterations caused by inflammation.

Objective To determine the intra- and inter-observer reliability of ultrasound (US)-detected age-related joint vascularization and ossification grading in healthy children. Methods Following standardized image acquisition and machine setting protocols, 10 international US experts examined four joints (wrist, second metacarpophalangeal joint, knee, and ankle) in 12 healthy children (divided into four age groups: 2–4, 5–8, 9–12, and 13–16 years). Grey-scale was used to detect the ossification grade, and power Doppler (PD) US was used to detect physiological vascularization. Ossification was graded from grade 0 (no ossification) to grade 3 (complete ossification). A positive PD signal was defined as any PD signal inside the joint. Kappa statistics were applied for intra- and inter-observer reliability. Results According to the specific joint and age, up to four solitary PD signals (mean, 1.5) were detected within each joint area with predominant localization of the physiological vascularization in specific anatomic positions: fat pad, epiphysis, physis, and short bone cartilage. The kappa values for ossification grading were 0.87 (range, 0.85–0.91) and 0.58 for intra- and inter-observer reliability, respectively. The bias-adjusted kappa values for intra- and inter-observer reliability were 0.71 (range, 0.44–1.00) and 0.69, respectively. Conclusion Detection of normal findings (i.e., grading of physiological ossification during skeletal maturation and identification of physiological vessels) can be highly reliable by using clear definitions and a standardized acquisition protocol. These data will permit development of a reliable and standardized US approach for evaluating paediatric joint pathologies. This article is protected by copyright. All rights reserved.

Musculoskeletal ultrasound (MSUS) of paediatric wrists and hands can be a challenge due to age-specific physiological development and findings. MSUS of the hands and wrists is an important tool to diagnose inflammatory conditions, and the examiner must be highly knowledgeable about the normal age-related findings in these anatomic regions. This chapter covers the most important standard scans of paediatric wrists and hands and gives an overview of the normal paediatric sonoanatomy. In this chapter, basic pathologic findings are demonstrated by examples from paediatric rheumatology.

Ultrasound imaging guidance of needles introduced for the purpose of joint aspiration or joint injection is becoming increasingly popular. The use of ultrasound increases the safety and efficacy of joint injections in pediatric rheumatology. Needle guidance may be important for diagnostic purposes (fluid aspiration) as well as injections in juvenile idiopathic arthritis (JIA) for short-term relief via intraarticular corticosteroid (CS) injections or longer-term management of limited disease and treatment-resistant multi-joint disease. Ultrasound guidance can also be used to inject steroids into tendon sheaths or around entheses in inflammatory conditions. The following chapter gives an overview of typical indications for ultrasound-guided intraarticular injections in pediatric rheumatology and describes the procedures used for ultrasound guidance of CS injections in specific anatomic regions.

The Second author’s name was incorrectly published in the original article. The correct name is Hartwig Wilhelm Lehmann.

Objective. Musculoskeletal (MS) ultrasound (US) is increasingly being used as an extension of paediatric clinical practice, particularly in the clinical management of children with juvenile idiopathic arthritis (JIA). MSUS is most commonly used in the assessment of effusion and synovial hypertrophy and detection of soft tissue disorders. It can also be used to visualise other structures, such as hyaline cartilage and bone surfaces. Given the unique anatomy of the growing skeleton, many of the difficulties encountered in its use result from misinterpretation of MSUS images. Thus, a detailed knowledge of anatomy in healthy children, both in B-mode and Doppler mode, is mandatory. Additionally, as US is the most operator-dependent imaging modality, the experience and expertise of the examiner will determine the value of the diagnostic information obtained from this technique. Incorrect acquisition and interpretation of images may result in inappropriate disease management. Thus, a systematic scanning method and a standardised evaluation procedure are essential in children.

Due to maturation of joints, various changes take place, not only in the field of paediatric rheumatology but also in paediatric orthopaedics musculoskeletal ultrasound plays an important role in both the diagnosis and the follow-up of diseases in this field. To differentiate between physiological and pathological findings, the knowledge of reference values of joint structures is indispensable. The objective was to define B-mode ultrasound age- and sex-related reference values for the elbow joint in healthy children and adolescents during maturation. In a cross-sectional, multicentre ultrasound study we examined both sides of the elbow joints of 437 healthy children and adolescents (194 boys/243 girls) being between one and less than 18 years old. The children were classified into six equal age groups and divided according to their gender. We measured the distance between the outer margin of the joint capsule and the bone surface to define the bone-capsule distance (BCD), the thickness of the joint cartilage as well as the thickness of the joint capsule. The bone–capsule junction zone and the shape of the joint capsule were analysed qualitatively. The bone capsule distance and the capsule thickness increased with age. In contrast, the joint cartilage thickness decreased. In most cases the junction zone was peaked. The joint capsule showed mostly a concave shape. Intra- and interobserver reliabilities were good. We propose B-mode ultrasound age- and sex-related reference values for the elbow joint in a large number of healthy children and adolescents for the first time. By applying these standard values to the ultrasound examination of the elbow joint, it may be possible to achieve greater certainty in the diagnosis of pathological processes.

Background Ultrasound (US) was found to have face and content validity for detecting synovitis in juvenile idiopathic arthritis (JIA) with higher sensitivity than clinical examination. In order to test validity and improve the applicability of US in JIA, the OMERACT US pediatric subtask force recently published preliminary definitions for the sonographic features of synovitis in children. Objectives Aim of this study was to confirm and improve B-mode and color power/Doppler (PD) US definitions for synovial components and grading in children, by using an image and patient based exercise. Methods The definitions were confirmed and modified in a multi-step process. In the 1st step, definitions were developed in multi-round Delphi web based consensus process were ≥80% of participants would need to reach ≥80% of agreement on a Likert scale from 1–5 (1 strongly disagree, 2 disagree, 3 neutral, 4 agree, 5 strongly agree). In the 2nd step, in a face to face meeting, a subgroup of these experts revised the definitions for final wording and performed intra- and inter-observer reliability exercise study in JIA patients as the final 3rd phase of the process. The definitions were tested in four joints (wrist, 2nd MCP, knee and ankle) of JIA patients divided in four age groups following standardized image acquisition and machine setting protocol. Statistics program R (version 3.3.0) was used for the statistical analyses. For intra-rater agreement Cohen kappa and for inter-rater agreement prevalence and bias adjusted kappa (PABAK) were calculated if needed. Results Reliability exercise included 20 JIA patients (distributed in equal numbers by age groups), 14 observers, 4 joints/observer, 3 observers/joint, 360 intra- and 360 inter-observer tests. A 0–3 semi-quantitative B-mode and color power/Doppler US definitions for synovial components and grading, were agreed (presented in Figure 1). Conclusions The proposed synovitis grading for children showed to be reliable why the next step should be to test sensitivity to change in order to possibly be used as an outcome tool in JIA. Disclosure of Interest None declared

Background Joint destruction in rheumatoid arthritis (RA) is comprised of hyaline cartilage and bone damage, with the former more clearly associated with irreversible physical disability than bony damage. Objectives To test the reliability of a semiquantitative scoring system for the assessment of cartilage by musculoskeletal ultrasound (US) in a web-based exercise as well as a patient-based reliability study of patients with RA. Methods Static images of metacarpophalangeal (MCP) joints 2–5 in RA patients and healthy controls were acquired and a dataset of 123 anonymized images including 25 duplicate images was circulated among an international EULAR-OMERACT taskforce of 25 rheumatologist experts in US who independently scored the images using a semiquantitative scoring system. Subsequently 12 taskforce members participated in a patient-based reliability study. During this meeting MCP joints 2–5 of 6 patients with RA were assessed twice on the same day by all experts using US machines (GE) equipped with high-frequency transducers (18–22MHz) with presets calibrated for the appropriate assessment of cartilage. Participants assessed metacarpal cartilage both in the standardized longitudinal midline scan as well as by freehand technique utilizing multiple planes and scored by the semiquantitative scoring system. Intraobserver reliability was assessed by Cohen9s kappa and interobserver reliability by Fleiss9 kappa. Results The three-grade semiquantitative (Grade 0, normal cartilage; Grade 1, minimal change; Grade 2, severe change) scoring system demonstrated excellent (kappa: 0.87) to good (kappa: 0.73) intraobserver reliability in the web-based exercise and the patient-based reliability study respectively. Interobserver reliability was good in the web-based exercise (kappa: 0.64) and moderate (kappa: 0.49) in the patient-based reliability study. The dynamic technique performed slightly better than the longitudinal midline scan alone. Conclusions A semiquantitative scoring system demonstrated good intra- and moderate to good inter-observer reliability in a web-based exercise and patient-based reliability study. Our study demonstrates that US is a reliable tool for evaluating cartilage and supports the use of a new semiquantitative US scoring system for evaluating cartilage change in RA. Acknowledgements The patient-based reliability study was supported by a research grant from UCB. Disclosure of Interest None declared

OBJECTIVES This study aimed to evaluate normal blood flow in the vertebral arteries and the basilar artery of preterm and term neonates by Doppler sonography. METHODS Blood flow in both vertebral arteries and the basilar artery was examined in 102 neonates between the biological ages of 28 and 41 weeks. Fifty-one boys and 51 girls underwent Doppler sonography. Measurements were usually undertaken at 6 days old. Systolic and diastolic flow velocities, including the resistive index, were measured and analyzed, taking into consideration biological age, weight, and sex. Anatomic aberrations of the vertebral arteries were recorded. RESULTS Mean blood flow values ± SD in the basilar artery were 35.2 ± 7.4 cm/s (systolic velocity) and 10.9 ± 3.5 cm/s (diastolic velocity). Mean blood flow values in the right vertebral artery were 26.8 ± 9.3 cm/s (systolic velocity) and 8.0 ± 3.7 cm/s (diastolic velocity). Mean blood flow values in the left vertebral artery were 28.6 ± 8.3 cm/s (systolic velocity) and 8.7 ± 3.3 cm/s (diastolic velocity). Systolic and diastolic blood flow in both vertebral arteries was significantly higher from 38 to 41 weeks compared with 28 to 32 and 33 to 37 weeks (P < .05). Regression analysis of systolic and diastolic blood flow velocities in the vertebral arteries versus biological age yielded significant results (P < .05). CONCLUSIONS Sonography is an excellent tool for examining blood flow in the basilar and vertebral arteries of premature and term neonates. Mean systolic and diastolic blood flow velocities in the vertebral arteries increase significantly with age.

We evaluated postnatal skeletal development of the proximal femoral epiphysis, distal femoral epiphysis (DFE) and proximal tibial epiphysis (PTE) in 178 premature and mature newborns, between 25 and 47 wk of biological age, using high-resolution B-mode musculoskeletal ultrasound. Approximate age-related values were determined based on the ossification center size and epiphyseal cartilage thickness. The earliest onsets of visible mineralization were at 30 wk of maturity in the DFE, 31 wk in the PTE and 43 wk in the proximal femoral epiphysis. In preterm and term neonates, significant correlations were observed for transverse and longitudinal length of the DFE and PTE with biological age (R² = 0.35-0.50, p

Objectives To produce ultrasound (US) consensus-based definitions of cartilage change in rheumatoid arthritis (RA) and assess its intraobserver and interobserver reliability in a web-based exercise. Methods We conducted a Delphi study on US defined cartilage change and a proposed semiquantitative (SQ) US scoring system for cartilage change in RA. A written Delphi questionnaire was developed based on a systematic literature review and expert international consensus and was distributed via consecutive written questionnaires by email to a group 35 rheumatologists from 17 countries with experience in musculoskeletal US. Taskforce members performed US B mode examination of the metacarpal cartilage in metacarpophalangeal joints 2–5 in RA patients and the images were collected in an electronic database. A reference image atlas of cartilage changes was developed for scoring 123 anonymized images including 25 duplicate images. These were sent to the participants who independently scored the images. Intraobserver reliability was assessed by Cohen9s kappa and interobserver reliability by Fleiss9 kappa. Results Group agreement (76–100%) was reached for 6 statements concerning: i) MSUS definition and assessment of normal hyaline cartilage, ii) elementary cartilage lesions in MSUS and iii) grading of elementary cartilage lesions in patients with RA in a two-round Delphi consensus process. A three-grade SQ (0–2) scoring system (grade 0, normal cartilage; grade 1, minimal change: blurring of outer and/or subchondral margin, focal thinning or incomplete loss of homogeneity of echostructure; grade 2, severe: diffuse thinning or complete loss of homogeneity of echostructure) was agreed for scoring cartilage damage in RA. Both intra- and inter-observer reliability were good (κ value of 0.87 and 0.64 respectively). Conclusions This study demonstrates that US is a reliable tool for evaluating cartilage in RA and strongly supports the use of a new reliable semiquantitative MSUS scoring system for cartilage change. Disclosure of Interest None declared