Overview
Unilateral amelia of the lower limb is a rare congenital condition in which a baby is born with one leg completely missing. The term 'amelia' comes from the Greek word meaning 'without a limb.' In this specific form, only one lower limb is absent, while the other leg and both arms develop normally. This condition is present at birth and is typically detected during prenatal ultrasound or immediately after delivery. The cause can vary — it may occur as an isolated birth defect with no clear genetic cause, or it may be part of a broader syndrome involving other birth differences. In some cases, environmental factors during early pregnancy, such as certain medications (notably thalidomide historically), vascular disruptions, or amniotic band syndrome, may play a role. Because this Orphanet entry is marked as 'OBSOLETE,' it has likely been reclassified or merged into a broader category of limb reduction defects. Patients and families should work with their medical team to determine the most current and accurate diagnosis. Treatment focuses on prosthetic fitting, physical therapy, and rehabilitation to maximize mobility and independence. Surgical interventions may sometimes be needed to shape the residual limb for better prosthetic use. With modern prosthetics and supportive care, many individuals with this condition lead active, fulfilling lives.
Key symptoms:
Complete absence of one leg from birthAsymmetry in body structureDifficulty with balance and mobilityPossible associated birth differences in some casesChallenges with walking and standing without assistive devicesPotential hip or pelvic differences on the affected side
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: Amelia of lower limb, unilateral.
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Specialists
View all specialists →No specialists are currently listed for OBSOLETE: Amelia of lower limb, unilateral.
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: Amelia of lower limb, unilateral.
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.Is my child's limb absence isolated, or could it be part of a syndrome?,Should we pursue genetic testing to look for an underlying cause?,When should my child be fitted for their first prosthesis?,What type of physical therapy will be most helpful at each stage of development?,Are there any associated health concerns we should screen for?,How often will the prosthesis need to be replaced as my child grows?,Can you recommend support groups or peer connections for families in our situation?
Common questions about OBSOLETE: Amelia of lower limb, unilateral
What is OBSOLETE: Amelia of lower limb, unilateral?
Unilateral amelia of the lower limb is a rare congenital condition in which a baby is born with one leg completely missing. The term 'amelia' comes from the Greek word meaning 'without a limb.' In this specific form, only one lower limb is absent, while the other leg and both arms develop normally. This condition is present at birth and is typically detected during prenatal ultrasound or immediately after delivery. The cause can vary — it may occur as an isolated birth defect with no clear genetic cause, or it may be part of a broader syndrome involving other birth differences. In some cases,
At what age does OBSOLETE: Amelia of lower limb, unilateral typically begin?
Typical onset of OBSOLETE: Amelia of lower limb, unilateral is neonatal. Age of onset can vary across affected individuals.