Pseudodiastrophic dysplasia: a distinct newborn skeletal dysplasia.

Pseudodiastrophic dysplasia is a distinct disorder that differs from diastrophic dysplasia on the basis of clinical, radiographic, and chondro-osseous histopathologic findings. In addition to the rhizomelic shortening of the limbs and severe clubfoot deformity, which suggest the diagnosis of diastrophic dysplasia, distinguishing features are elbow and proximal interphalangeal joint dislocations, platyspondyly, and scoliosis, which are observed in infancy. This disorder has been reported previously in three infants, all of whom died in the first year of life. Two of these were sisters, suggesting autosomal recessive inheritance. We report four new patients with this distinct skeletal dysplasia, including two children now older than 4 years of age. In both of these patients neonatal contractures have improved with physical therapy and scoliosis has progressed significantly.