Competency-based Assessment in Musculoskeletal Ultrasound- a Validity Study

Early diagnosis and rapid treatment initiation are of most importance to prevent joint damage in patients with arthritis. Musculoskeletal ultrasound (MSUS) is becoming an integrated part of rheumatology routine care and is more sensitive than clinical examination for detecting synovitis even in the early stage of disease.

However, MSUS is highly operator dependent and competences are needed to ensure correct image interpretation. Traditionally competences are evaluated on how many examinations the trainees have performed, but the gold standard has now shifted towards competency-based education where objective assessment tools are the key element. A previous study has developed a scale for assessment of ultrasound competence, The Objective Structured Assessment of Ultrasound skills (OSAUS). Although expert consensus supports evidence of content validity of the assessment instrument, it is not known if the OSAUS scale can discriminate differences in performance scores between different levels of MSUS experience in rheumatology in a reliable way.