The epiphyseal spur.
A small spur seen at the edge of an open epiphyseal line indicates the presence of an open epiphysis when this is not clear radiographically. In addition, the spur should not be mistaken for an avulsion fracture.
D000293:Adolescent; D000328:Adult; D002357:Cartilage Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging*; D002648:Child; D004838:Epiphyses / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging; D008297:Male; D008663:Metacarpus / Q000000981:diagnostic imaging; D011859:Radiography; D011884:Radius / Q000000981:diagnostic imaging