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Diastrophic dysplasia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Conditions

Diastrophic dysplasia

Diastrophic dysplasia is a rare genetic disorder of cartilage and bone development that causes short stature, joint deformities, and other skeletal abnormalities.

Overview and Symptoms

Diastrophic dysplasia is a disorder of cartilage and bone development. Affected individuals have short stature with very short arms and legs. Most also have early-onset joint pain (osteoarthritis) and joint deformities called contractures, which restrict movement. These joint problems often make it difficult to walk and tend to worsen with age.

Additional features of diastrophic dysplasia include:

  • An inward- and upward-turning foot
  • Progressive abnormal curvature of the spine
  • Unusually positioned thumbs (hitchhiker thumbs)
  • An opening in the roof of the mouth (a cleft palate), present in about half of affected infants
  • Swelling of the external ears in newborns, which can lead to thickened, deformed ears

The signs and symptoms of diastrophic dysplasia are similar to those of another skeletal disorder called atelosteogenesis type 2; however, diastrophic dysplasia tends to be less severe. Although some affected infants have breathing problems, most people with diastrophic dysplasia live into adulthood.

Frequency

Although the exact prevalence of diastrophic dysplasia is unknown, researchers estimate that it affects about 1 in 500,000 newborns in the United States. This condition is more common in Finland, where it affects about 1 in 33,000 newborns.

Causes

Diastrophic dysplasia is one of several skeletal disorders caused by mutations in the SLC26A2 gene. This gene provides instructions for making a protein that is essential for the normal development of cartilage and for its conversion to bone. Cartilage is a tough, flexible tissue that makes up much of the skeleton during early development. Most cartilage is later converted to bone, except for the cartilage that continues to cover and protect the ends of bones and is present in the nose and external ears. Mutations in the SLC26A2 gene alter the structure of developing cartilage, preventing bones from forming properly and resulting in the skeletal problems characteristic of diastrophic dysplasia.

Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Other Names for This Condition

  • Diastrophic dwarfism
  • DTD

Frequently Asked Questions

Diagnosis is typically confirmed through genetic testing that identifies mutations in the SLC26A2 gene. Prenatal diagnosis is possible via ultrasound, which can reveal characteristic skeletal abnormalities such as short limbs, curved bones, and cleft palate, or through chorionic villus sampling and amniocentesis for direct genetic analysis if a family history exists.
The condition is inherited in an autosomal recessive pattern, meaning both parents must carry one copy of the mutated SLC26A2 gene. If both parents are carriers, there is a 25% chance with each pregnancy that the child will be affected, a 50% chance the child will be an unaffected carrier, and a 25% chance the child will not carry the mutation. Genetic counseling is recommended for families with a history of the disorder.
Most individuals with diastrophic dysplasia have normal intelligence and cognitive development. While some infants may experience breathing difficulties due to chest wall abnormalities, the majority survive into adulthood. Life expectancy is generally not significantly reduced, though quality of life can be impacted by chronic pain and mobility limitations.
Management focuses on physical therapy to maintain range of motion and prevent further stiffening, along with the use of orthopedic braces to support joints and correct deformities. Pain management may involve non-steroidal anti-inflammatory drugs (NSAIDs) or other analgesics, and in severe cases, surgical interventions such as osteotomies or joint replacements may be considered to improve mobility and reduce pain.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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