Abstract: @@ Achondroplasia (ACH) is the most common form of skeletal dysplasia characterized by disproportionately short stature, lumbar lordosis, relative macrocephaly and other skeletal anomalies resulting from a defect in the maturation of the chondrocytes in the growth plate of the cartilage. The combined frequency of the disease has been estimated to be 1 in 15 000 live births.1 ACH is inherited in autosomal dominant fashion with a complete penetrance, more than 80% of affected individuals have de novo mutations associated with increased paternal age.