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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.

Objective: To standardize ultrasound (US) in enthesitis. Methods: An initial Delphi exercise was undertaken to define US-detected enthesitis and its core components. These definitions were subsequently tested on static images taken from spondyloarthritis patients in order to evaluate their reliability. Results: Excellent agreement (>80%) was obtained for including hypoechogenicity, increased thickness of the tendon insertion, calcifications, enthesophytes, erosions, and Doppler activity as core elementary lesions of US-detected enthesitis. US definitions were subsequently obtained for each elementary component. On static images, the intraobserver reliability showed a high degree of variability for the detection of elementary lesions, with kappa coefficients ranging from 0.13-1. The interobserver kappa values were variable, with the lowest kappa coefficient for enthesophytes (0.24) and the highest coefficient for Doppler activity at the enthesis (0.63). Conclusion: This is the first consensus-based US definition of enthesitis and its elementary components and the first step performed to ensure a higher degree of homogeneity and comparability of results between studies and in daily clinical work.

Objective Various methods are utilized in daily practice to obtain optimal information on effusion in the knee. Our aim is to investigate which scanning position provides the best information about synovial fluid in the knee by using ultrasound and to evaluate the magnitude of difference for measuring synovial fluid in 3 major recesses (suprapatellar, medial parapatellar, and lateral parapatellar) of the knee according to various degrees of flexion. Methods Sonographers in 14 European centers documented bilateral knee joint ultrasound examinations on a total of 148 knee joints. The largest sagittal diameter of fluid was measured in scans corresponding to the 3 major recesses at different (0°, 15°, 30°, 45°, 60°, and 90°) degrees of flexion of the knee. The difference of measurement of effusion according to transducer position, knee position, and the interaction between them was investigated by analysis of variance followed by Tukey's test. Results No correlation was noted between patient characteristics and ultrasound detection of effusion. The sagittal diameter of synovial fluid in all 3 recesses was greatest at 30° flexion. Analysis of variance and Tukey's test revealed that the suprapatellar scan and 30° flexion is the best combination for detecting effusion as confirmed by receiver operator characteristic curve analysis. Conclusion The suprapatellar scan of the knee in 30° flexion was the most sensitive position to detect fluid in knee joints. Sagittal diameter of fluid in all 3 recesses increased with the knee in the 30° flexed position as compared to the extended position.