Skip to content
knowrare
HealthSignal
Your condition community

Living with Radial hemimelia

A rare limb difference present from birth in which the radius, a forearm bone, is partly or fully missing.

Understanding Radial hemimelia

Radial hemimelia is a rare limb difference present from birth in which the radius bone of the forearm is partly or completely missing.

It often affects the thumb and the wrist bones, and the hand or fingers may bend toward the forearm. GARD lists onset during pregnancy, at birth, or in infancy.

Signs & symptoms

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

  • Missing or underdeveloped radius bone
  • Thumb differences
  • Missing first hand bone
  • Wrist bone differences
  • Hand or fingers turned toward the forearm

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 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); 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
Is genetic testing available to find the cause?
What surgery or therapy can improve hand and arm function?
Should other body systems, like the heart or kidneys, be checked?

Quick facts

Symptoms usually startduring Pregnancy, at Birth, and as an Infant
InheritanceX-Linked

GARD says gene changes cause this condition and lists X-linked inheritance. It doesn't name a gene here.

Genetic

Also known as: congenital longitudinal deficiency of the radius; longitudinal deficiency of radius; longitudinal reduction defect of radius; radial clubhand; radial longitidinal meromelia; radial ray agenesis

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Radial hemimeliaGARD ID 225 · 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 Radial hemimelia.

Explore the Radial hemimelia blog

Explore research for Radial hemimelia

Explore actively recruiting Radial hemimelia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Radial hemimelia with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Radial hemimelia studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

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

Get Signals for Radial hemimelia

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Radial hemimelia

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Radial hemimelia experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.