An osteochondrodysplasia characterized by prenatal onset of disproportionate short stature, shortening of the limbs, joint hyperlaxity and/or dislocations, micrognathia, cleft palate, brachydactyly, short metacarpals, supernumerary carpal ossification centers and dysmorphic facial features that has_material_basis_in homozygous or compound heterozygous mutation in IMPAD1 on chromosome 8q12.