Overview
This Orphanet entry (code 328269) is labeled as 'OBSOLETE' and refers to a former grouping category called 'Rare bone disease with limb reduction defect.' This was not a single specific disease but rather an umbrella classification that Orphanet once used to organize a group of rare bone conditions in which one or more limbs (arms or legs) are shorter than normal, partially missing, or completely absent. These limb reduction defects can range from a missing finger or toe to the absence of an entire arm or leg. They may occur on their own or as part of a broader genetic syndrome. Because this category has been retired (marked obsolete), patients and families who were previously classified under this heading are now directed to more specific diagnoses. Examples of conditions that fall under limb reduction defects include Roberts syndrome, Holt-Oram syndrome, thrombocytopenia-absent radius (TAR) syndrome, ectrodactyly, phocomelia, and various forms of longitudinal or transverse limb deficiency. Each of these has its own genetic cause, inheritance pattern, and treatment approach. If you or your child has been told you have a 'rare bone disease with limb reduction defect,' it is important to work with a clinical geneticist to identify the specific underlying condition. A precise diagnosis allows for better medical management, genetic counseling, and connection to the right patient support communities. Treatment generally focuses on orthopedic interventions, prosthetics, physical therapy, and surgical correction when appropriate, though the exact plan depends entirely on the specific diagnosis.
Also known as:
Key symptoms:
Shortened arms or legsMissing fingers or toesAbsent or underdeveloped limbsDifferences in limb length between left and right sidesMissing forearm or lower leg bonesFused or webbed fingers or toesReduced grip strength or hand functionDifficulty with walking or balanceJoint stiffness or limited range of motionAbnormal bone shape visible on X-ray
Variable
Can be inherited in different ways depending on the underlying gene
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for OBSOLETE: Rare bone disease with limb reduction defect.
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Specialists
View all specialists →No specialists are currently listed for OBSOLETE: Rare bone disease with limb reduction defect.
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 OBSOLETE: Rare bone disease with limb reduction defect.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
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 is the specific diagnosis causing my child's limb difference?,Is genetic testing recommended, and what might it tell us?,Are there other organs or body systems we should check?,What is the chance this could happen again in a future pregnancy?,Would my child benefit from a prosthetic limb, and when should we start?,What therapies are recommended to help with daily function?,Are there clinical trials or new treatments being studied for this condition?
Common questions about OBSOLETE: Rare bone disease with limb reduction defect
What is OBSOLETE: Rare bone disease with limb reduction defect?
This Orphanet entry (code 328269) is labeled as 'OBSOLETE' and refers to a former grouping category called 'Rare bone disease with limb reduction defect.' This was not a single specific disease but rather an umbrella classification that Orphanet once used to organize a group of rare bone conditions in which one or more limbs (arms or legs) are shorter than normal, partially missing, or completely absent. These limb reduction defects can range from a missing finger or toe to the absence of an entire arm or leg. They may occur on their own or as part of a broader genetic syndrome. Because this
At what age does OBSOLETE: Rare bone disease with limb reduction defect typically begin?
Typical onset of OBSOLETE: Rare bone disease with limb reduction defect is neonatal. Age of onset can vary across affected individuals.