Overview
Split foot, unilateral (also called unilateral ectrodactyly or lobster claw foot on one side) is a rare congenital limb malformation in which one foot has missing central toes and a deep cleft that divides the front of the foot into two parts, giving it a claw-like appearance. The term 'OBSOLETE' in the Orphanet classification means this specific entry has been retired or merged into a broader category of split hand/foot malformations (ectrodactyly). In this condition, only one foot is affected, while the other foot appears normal. The condition is present at birth and results from abnormal development of the limb bud during early pregnancy. The severity can vary widely. Some people have a mild cleft with only minor toe abnormalities, while others may have significant missing bones and a deep split in the foot. Walking and balance may be affected depending on how much of the foot structure is altered. Many individuals adapt well, especially with supportive footwear or orthotics. In some cases, surgery can improve the shape and function of the foot. Split foot can occur as an isolated finding (meaning no other body parts are affected) or as part of a broader genetic syndrome. When it occurs on its own and on just one side, it may arise sporadically without a family history, though genetic factors can still play a role. Treatment focuses on improving function and comfort, and may involve orthopedic surgery, custom shoes, physical therapy, and ongoing monitoring during growth.
Key symptoms:
Deep cleft or split in the middle of one footMissing toes, especially the central toesFoot that looks like a lobster claw on one sideFused or webbed remaining toesAbnormally shaped foot bonesDifficulty fitting into standard shoesAltered walking pattern or gaitBalance difficultiesOne foot appearing normal while the other is affectedPossible mild leg length difference
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: Split foot, unilateral.
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Specialists
View all specialists →No specialists are currently listed for OBSOLETE: Split foot, 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: Split foot, unilateral.
Community
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Caregiver Resources
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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.Is my child's split foot isolated, or could it be part of a genetic syndrome?,Should we pursue genetic testing, and what would it tell us?,What surgical options are available, and when is the best time for surgery?,Will my child be able to walk and run normally?,What type of shoes or orthotics do you recommend?,How often should we schedule follow-up visits during growth?,Are there any risks that this could affect future children in our family?
Common questions about OBSOLETE: Split foot, unilateral
What is OBSOLETE: Split foot, unilateral?
Split foot, unilateral (also called unilateral ectrodactyly or lobster claw foot on one side) is a rare congenital limb malformation in which one foot has missing central toes and a deep cleft that divides the front of the foot into two parts, giving it a claw-like appearance. The term 'OBSOLETE' in the Orphanet classification means this specific entry has been retired or merged into a broader category of split hand/foot malformations (ectrodactyly). In this condition, only one foot is affected, while the other foot appears normal. The condition is present at birth and results from abnormal de
At what age does OBSOLETE: Split foot, unilateral typically begin?
Typical onset of OBSOLETE: Split foot, unilateral is neonatal. Age of onset can vary across affected individuals.