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Living with Multiple synostoses syndrome 2

A rare inherited condition in which joints in the fingers, wrists, ankles, and neck slowly fuse, with hearing loss.

Understanding Multiple synostoses syndrome 2

Multiple synostoses syndrome 2 (SYNS2) is a rare inherited condition in which joints slowly fuse together.

Joints in the fingers, wrists, ankles, and neck bones (cervical spine) fuse over time. People also have distinct facial features, including a broad, tube-shaped nose, and hearing loss that slowly gets worse (conductive). It is autosomal dominant.

Signs & symptoms

GARD doesn't list common symptoms for this condition yet. It lists these as less common features:

  • Club feet
  • Fused wrist bones (carpal synostosis)
  • Fused ankle bones
  • Fused finger bones

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
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
Which specialists should follow my joints and hearing?
How often should hearing be checked?
Is genetic testing available for our family?

Quick facts

InheritanceAutosomal Dominant

GARD doesn't list a cause for this condition yet. It is autosomal dominant, which means one changed copy of a gene can be enough to cause it.

Also known as: gdf5 multiple synostoses syndrome; multiple synostoses syndrome caused by mutation in gdf5; multiple synostoses syndrome type 2; syns2

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Multiple synostoses syndrome 2GARD ID 9916 · 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 Multiple synostoses syndrome 2.

Explore the Multiple synostoses syndrome 2 blog

Explore research for Multiple synostoses syndrome 2

Explore actively recruiting Multiple synostoses syndrome 2 studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Multiple synostoses syndrome 2 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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