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An osteochondrodysplasia, [note 1] or skeletal dysplasia, is a disorder of the development of bone and cartilage. [1] Osteochondrodysplasias are rare diseases . About 1 in 5,000 babies are born with some type of skeletal dysplasia. [ 2 ]
Pseudoachondroplasia (also known as PSACH, pseudoachondroplastic dysplasia, and pseudoachondroplastic spondyloepiphyseal dysplasia syndrome) is an osteochondrodysplasia that results in mild to severely short stature due to the inhibition of skeletal growth primarily in the limbs. [2]
Over 100 specific skeletal dysplasias have been identified. Chondrodystrophy is found in all races and in both females and male and occurs in around one of every 25,000 children. Chondrodystrophy and achondroplasia are the most common forms of genetic hyaline disorders.
Achondrogenesis, type 2 is an uncommon skeletal dysplasia that is autosomal dominant and occurs at a frequency of approximately 0.2 per 100,000 births. [1] Also known by the name Langer-Saldino achondrogenesis, it is one of the fatal short-limbed dwarfisms linked to structural mutations in type II collagen.
Platyspondylic lethal skeletal dysplasia, Torrance type is a severe disorder of bone growth. [1] People with this condition have very short arms and legs, a small chest with short ribs, underdeveloped pelvic bones , and unusually short fingers and toes ( brachydactyly ).
Conradi–Hünermann syndrome is a form of chondrodysplasia punctata, a group of rare genetic disorders of skeletal development involving abnormal accumulations of calcium salts within the growing ends of long bones. Conradi–Hünermann syndrome is commonly associated with mild to moderate growth deficiency, disproportionate shortening of long ...
Many of the features of SADDAN are similar to those seen in other skeletal disorders, specifically achondroplasia and thanatophoric dysplasia. Achondroplasia is a form of short-limbed dwarfism. This type of dwarfism is caused by the inability of the cartilage of the skeleton to ossify and turn to bone. [5]
Genetic skeletal dysplasias or Osteochondrodysplasia frequently lead to short stature, occasionally termed dwarfism, which is classified into proportionate and disproportionate short stature. Disproportionate short stature is further classified short-limb short stature and short-trunk short stature.
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