title: The case of the repetitious ripple.
authors.affiliation: Fairview Hospital, Great Barrington, Mass, USA.
authors.forename: N J
authors.initials: NJ
authors.lastname: Martin
mesh_terms: D000328:Adult; D016477:Artifacts; D004868:Equipment Failure; D005260:Female; D006801:Humans; D011859:Radiography / Q000295:instrumentation; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging*; D012447:Sacrum / Q000000981:diagnostic imaging*