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Survey about achondroplasia
We have designed a questionnaire with the purpose to better know the population connected to achondroplasia.
The questionnaire is optional and anonymous. The data obtained will be used for statistical purposes and to better understand the natural history of achondroplasia. Please consider answering.
If you would like to take the survey later, you can click on the link at the top "Register at BA"
Click on the sections below to access the respective growth charts:

7 8 BMI clear

hc clear foramen magnum 3

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Foramen magnum transverseForamen magnum sagittal
Curves for the growth of the foramen magnum in the transverse (a) and sagittal (b) dimensions for both children with achondroplasia (lower curves in both graphics) and of average height (upper curves in both graphics) from age 0 to 18 years of age (in months). The curves for both populations don't overlap.
Credits: Hecht, et al.


  1. Hecht, J.T., et al., Growth of the foramen magnum in achondroplasia. Am J Med Genet, 1989. 32(4): p. 528-35. Available from:
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