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Living with Upper limb mesomelic dysplasia

A rare bone condition present at birth with a small ulna and a strongly bowed radius in the forearm, with normal height.

Understanding Upper limb mesomelic dysplasia

Upper limb mesomelic dysplasia is a rare bone condition that affects only the forearms, with an underdeveloped ulna and a strongly bowed radius.

People have normal height. It is noticed at birth.

Signs & symptoms

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

  • Underdeveloped ulna (forearm bone)
  • Strongly bowed radius (forearm bone)
  • Fingers that bend toward the little finger

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
Would genetic counseling help our family?
Which specialists, such as an orthopedic specialist, should we see?
What options help with forearm and hand function?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Dominant

GARD says changes in genes (variants) cause this condition and that it is autosomal dominant, so one changed copy of a gene can be enough. It doesn't name a specific gene.

Genetic

Also known as: fryns-hofkens-fabry syndrome; mesomelic dysplasia of upper limb; ulna hypoplasia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Upper limb mesomelic dysplasiaGARD ID 2408 · 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 Upper limb mesomelic dysplasia.

Explore the Upper limb mesomelic dysplasia blog

Explore research for Upper limb mesomelic dysplasia

Explore actively recruiting Upper limb mesomelic dysplasia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Upper limb mesomelic dysplasia 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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