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Living with Humeral agenesis/hypoplasia

A rare limb difference at birth in which the upper arm bone is missing or underdeveloped, leaving a short arm.

Understanding Humeral agenesis/hypoplasia

Humeral agenesis/hypoplasia is a rare limb difference in which the upper arm bone (humerus) is missing or underdeveloped.

It is not part of a larger syndrome. One or both arms are short. The forearm may look attached directly to the shoulder, with no shoulder or elbow joints. The radius may bow, the ulna may be short, and the hand may tilt at the wrist.

Signs & symptoms

GARD doesn't list specific symptoms for this condition. Its summary describes:

  • Short arm on one or both sides
  • Missing or small upper arm bone
  • Forearm appears attached to shoulder
  • No elbow joint
  • Bowed radius and short ulna
  • Hand tilted at the wrist

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
What therapy or devices could help with arm use?
Would an orthopedic specialist or hand surgeon be right for us?
Would genetic counseling help our family?

Quick facts

Changes in genes (also called variants) cause this condition. GARD doesn't list a specific gene or inheritance pattern.

Genetic

Also known as: congenital absence of humerus; congenital hypoplasia of humerus; congenital short humerus; humeral intercalary meromelia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Humeral agenesis/hypoplasiaGARD ID 21192 · 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 Humeral agenesis/hypoplasia.

Explore the Humeral agenesis/hypoplasia blog

Explore research for Humeral agenesis/hypoplasia

Explore actively recruiting Humeral agenesis/hypoplasia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Humeral agenesis/hypoplasia 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

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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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