Moreover, it will be found, if a number of brachydactylous persons are examined, that no two of them are affected to exactly the same degree.    From Wordnik.com.  [Applied Eugenics] Reference

It tends to affect the entire skeleton, and in a family where one child is markedly brachydactylous, that child is generally shorter than the others.    From Wordnik.com.  [Applied Eugenics] Reference