Boogard's angle is measured by drawing a line from basion to opisthion and another line along the plane of the clivus to the basion intersecting the first line - the angle between these two lines is measured.
The normal angle is 126° +/- 6°. If the angle measures more than 136° it is indicative of platybasia.
History and etymology
J A Boogard, Professor of Pathological Anatomy at Leiden University, described his eponymous angle in 1865 2.
- 1. Berry. Diagnostic Radiology: Neuroradiology: Head and Neck Imaging. Jaypee Brothers Medical Publishers (P) Ltd. (2006) ISBN:8180616363. Read it at Google Books - Find it at Amazon
- 2. Boogard JA. De Indrukking der Grondvlakte van Schedel Dorr de Werwelkolom, Hare Oorzaken en Gevolgen (translation: Basilar Impression: Its Causes and Consequences). Nederl. Tysdschr. v. Geneesk. Bd. 1. Tweede: Afedling;1865;2:81-108.