The hip is a large joint where MRI is widely used; however, musculoskeletal ultrasound (MSKUS) is also often used both in children and adults for selected clinical indications. According to the European Society of Musculoskeletal Radiology, hip MSKUS is indicated for several clinical conditions involving the joint, soft tissues, and nerves. For some clinical circumstances such as fluid detection and signs related to osteoarthritis such as synovitis, effusions, and synovial cysts, MSKUS is highly indicated with an evidence level of A (consistent randomized controlled clinical trial, cohort study, all or none clinical decision rules validated in different populations) according to expert consensus. The article of Tagliafico et al. (2017) present some frequent and less frequent conditions where MSKUS is usually performed in adult hips.
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