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Am J Dis Child. 1920;19(1):1-37. doi:10.1001/archpedi.1920.01910190009001.
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INTRODUCTION  Ita P. appeared in the orthopedic outpatient department of the Children's Hospital for treatment because of a "bunch" on her back. As usual, a roentgen-ray examination was made. The plates showed widely separated vertebral bodies with a peculiar wedge-shaped vertebra at the point of the "bunch." As this did not seem to be due to any of the more common processes, further study was instituted.Following this, Jansen's "Achondroplasia" was studied, and it was while studying this that the idea suggested itself that the peculiar wedge-shaped vertebra might easily be a result of his "amnio pressure," although he makes no mention of this condition. Furthermore, the significance of the following statement of G. Elliot Smith (of the University of Manchester) became evident. "His (Jansen's) hypothesis cannot fail to serve the even greater purpose of stimulating research, by giving a new point of view, an illuminating suggestion, which is certain


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