Achondroplasia, one of the most common form of dwarfism, among the Morquio's disease, cretinism, rickets, diastrophic dwarfism and mongolism, is a skeletal inborn error in which the subjects characteristically presents;

1. a pronounced shortness of the extremities (micromelia)

2. some enlargement of the head, associated with a conspicuous depression at the root of the nose.

Though the actual cause is unknown, it is resulted from disturbance of enchondral bone formation, and has a tendency to be transmitted as a hereditary, congenital and familial disturbance. They have also well developed musculature and average mental capacity, and therefore, they often appear as circus freaks.

Though they have been presented for long ago, there was no report for morphological analysis of them in Korea. Now, we report morphological analysis of 6 cases of achondroplasia on height, sitting height, length of each extremity and skeletal deformities with clinical measures as well as roentgenogram.

Age distribution is from 26 to 65 years, old. They ranged from 118.5cm to 153cm in height, from 67cm to 87cm in sitting height, and have shortening and deformities of the long bones by roentgenogram.