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Living with Ulna hypoplasia-intellectual disability syndrome

A very rare genetic condition with short forearms, club feet, small or missing nails, and developmental delay.

Understanding Ulna hypoplasia-intellectual disability syndrome

Ulna hypoplasia-intellectual disability syndrome is a very rare condition with short forearms, club feet on both sides, missing or small nails, and developmental delay.

People have severely delayed development and intellectual disability. It is noticed in the newborn period or infancy.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Underdeveloped forearm bone (ulna)
  • Short forearms
  • Club feet
  • Small or missing fingernails and toenails
  • Global developmental delay and intellectual disability
  • Severe short stature

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include bone and joint specialists, brain and nervous system specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Would genetic counseling help our family?
Which specialists, such as an orthopedic specialist, should we see?
What therapies could help with development and movement?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive

GARD says this condition is autosomal recessive, so a child inherits a changed copy of a gene from each parent. It doesn't name a specific gene.

GeneticNeurological

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Ulna hypoplasia-intellectual disability syndromeGARD ID 5398 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Ulna hypoplasia-intellectual disability syndrome.

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  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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