Overview
Gnathodiaphyseal dysplasia (GDD) is a rare inherited bone disorder that mainly affects the jaw (gnath- means jaw) and the middle sections of the long bones in the arms and legs (diaphyseal refers to the shaft of a bone). It is sometimes called gnathodiaphyseal sclerosing dysplasia. The condition causes bones to become unusually dense and thick in some areas while also being fragile and prone to breaking. People with GDD often experience repeated fractures of the long bones, even from minor injuries, as well as serious problems with the jawbones, including infections of the jaw bone (osteomyelitis) that can be difficult to treat. The jaw problems are a hallmark of this disease. Affected individuals may develop painful swelling, open sores in the mouth, and loss of teeth due to bone infections in the jaw. The long bones of the arms and legs may bow or curve over time. Bone density scans often show areas of abnormal thickening alongside areas of weakness. Treatment focuses on managing symptoms rather than curing the disease. This includes surgical care for jaw infections, fracture management, and medications to support bone health such as bisphosphonates. A team of specialists is usually needed to provide the best care. Because GDD is so rare, treatment is largely guided by individual case experience rather than large clinical trials.
Also known as:
Key symptoms:
Repeated fractures of the arm and leg bones, often from minor injuriesPainful jaw bone infections (osteomyelitis of the jaw)Swelling and open sores in the mouth or jaw areaLoss of teeth due to jaw bone diseaseBowing or curving of the long bones in the arms and legsAbnormal thickening and increased density of certain bonesDifficulty chewing or opening the mouth fullySlow healing of jaw wounds after dental proceduresBone pain, especially in the legs and jaw
Clinical phenotype terms (7)— hover any for plain English
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Childhood
Begins in childhood, roughly ages 1 to 12
Treatments
No FDA-approved treatments are currently listed for Gnathodiaphyseal dysplasia.
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Specialists
View all specialists →No specialists are currently listed for Gnathodiaphyseal dysplasia.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Gnathodiaphyseal dysplasia.
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What genetic testing do you recommend to confirm the diagnosis, and should other family members be tested?,How often should I have imaging of my bones and jaw to monitor for changes?,What precautions should I take before any dental procedure to reduce the risk of jaw infection?,Are bisphosphonate medications appropriate for me, and what are the risks and benefits?,What are the warning signs of a jaw infection that should prompt an emergency visit?,Are there any clinical trials or research studies I could participate in?,What specialists should be part of my long-term care team?
Common questions about Gnathodiaphyseal dysplasia
What is Gnathodiaphyseal dysplasia?
Gnathodiaphyseal dysplasia (GDD) is a rare inherited bone disorder that mainly affects the jaw (gnath- means jaw) and the middle sections of the long bones in the arms and legs (diaphyseal refers to the shaft of a bone). It is sometimes called gnathodiaphyseal sclerosing dysplasia. The condition causes bones to become unusually dense and thick in some areas while also being fragile and prone to breaking. People with GDD often experience repeated fractures of the long bones, even from minor injuries, as well as serious problems with the jawbones, including infections of the jaw bone (osteomyeli
How is Gnathodiaphyseal dysplasia inherited?
Gnathodiaphyseal dysplasia follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Gnathodiaphyseal dysplasia typically begin?
Typical onset of Gnathodiaphyseal dysplasia is childhood. Age of onset can vary across affected individuals.