Overview
Isolated absence of both lower leg and foot is a rare congenital limb deficiency present at birth. In this condition, a baby is born without the lower parts of both legs (the area below the knee) and both feet. The term 'isolated' means this limb difference occurs on its own, without other major birth defects or syndromes affecting other organ systems. This condition is also sometimes referred to as bilateral congenital absence of the lower leg, bilateral apodia with tibial and fibular absence, or bilateral terminal transverse deficiency of the lower limbs. The condition is apparent immediately at birth. Because both lower legs and feet are missing, the child will face significant challenges with mobility and will typically require prosthetic legs to stand and walk. With modern prosthetic technology and rehabilitation, many children with this condition can achieve a good level of mobility and independence. Early intervention with pediatric orthopedic specialists and prosthetists is essential to help the child reach developmental milestones like standing and walking. The exact cause of this condition is not always known. In most cases, it appears to occur sporadically, meaning it happens by chance during fetal development without a clear genetic cause. Possible contributing factors may include disruptions in blood supply to the developing limbs during pregnancy, environmental exposures, or in rare cases, genetic factors. Treatment focuses on fitting the child with appropriate prosthetic devices, physical therapy to build strength and balance, and ongoing orthopedic care as the child grows. Psychological support for both the child and family is also an important part of comprehensive care.
Key symptoms:
Absence of both lower legs below the knee at birthAbsence of both feet at birthInability to stand or walk without assistive devicesShortened limbs on both sidesPossible residual limb sensitivity or discomfortDifficulty with balanceDelayed motor milestones such as standing and walkingNeed for prosthetic legsPossible skin irritation at the residual limb from prosthetic usePotential emotional or psychological challenges related to limb difference
Sporadic
Usually appears on its own, not inherited from a parent
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Isolated absence of both lower leg and foot.
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Specialists
View all specialists →No specialists are currently listed for Isolated absence of both lower leg and foot.
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 Isolated absence of both lower leg and foot.
Community
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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 caused my child's limb difference, and is there a risk it could happen again in future pregnancies?,At what age should my child be fitted with their first prosthetic legs?,How often will the prosthetics need to be replaced as my child grows?,What types of physical therapy will help my child learn to walk and stay active?,Are there any genetic tests recommended to rule out an underlying syndrome?,What resources are available for emotional and psychological support for my child and our family?,Are there specialized sports or activity programs for children with limb differences?
Common questions about Isolated absence of both lower leg and foot
What is Isolated absence of both lower leg and foot?
Isolated absence of both lower leg and foot is a rare congenital limb deficiency present at birth. In this condition, a baby is born without the lower parts of both legs (the area below the knee) and both feet. The term 'isolated' means this limb difference occurs on its own, without other major birth defects or syndromes affecting other organ systems. This condition is also sometimes referred to as bilateral congenital absence of the lower leg, bilateral apodia with tibial and fibular absence, or bilateral terminal transverse deficiency of the lower limbs. The condition is apparent immediate
How is Isolated absence of both lower leg and foot inherited?
Isolated absence of both lower leg and foot follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Isolated absence of both lower leg and foot typically begin?
Typical onset of Isolated absence of both lower leg and foot is neonatal. Age of onset can vary across affected individuals.