MedGen

Any brachydactyly type A1 in which the cause of the disease is a mutation in the BMPR1B gene. [from MONDO]

Acrocapitofemoral dysplasia (ACFD) is an autosomal recessive skeletal dysplasia characterized by postnatal-onset disproportionate short stature, relatively large head, narrow thorax, lumbar lordosis, short limbs, and brachydactyly with small broad nails (Ozyavuz Cubuk and Duz, 2021). [from OMIM]

A congenital malformation with apparent shortness (or absence) of the middle phalanges of all digits and occasional fusion with the terminal phalanges. The proximal phalanges of the thumbs and big toes are short. Tendency to be of short stature in adulthood. Inherited as an autosomal dominant trait. [from SNOMEDCT_US]

Hypoplastic (short) proximal phalanx of the thumb. In contrast to the proximal phalanges of the digits 2-5, the proximal phalanx of the thumb is embryologically equivalent to the middle phalanges of the other digits, whereas the first metacarpal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the other digits. [from HPO]