 Pseudoachondroplasia is an osteochondrodysplasia made distinctive by disproportionate short stature, hip and knee deformities, brachydactly (short fingers) and ligamentous laxity.It affects at least 1 in 20,000 individuals.Pseudoachondroplasia is inherited in an autosomal dominant manner and is caused solely by mutations in the cartilage oligomeric matrix protein COMP gene.