Not surprisingly (because we do so much MSKUS), we prefer US in this context because of 1) the ability to apply color Doppler for detection of hyperemia, 2) the ability to detect synovial proliferation, 3) the ability to detect confounding conditions (tendinopathy/calcium deposition/OA), 4) the logistical convenience of the technique and rapidity of results, and 5) lower cost/no GAD exposure