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Living with Fibular dimelia-diplopodia syndrome

A very rare genetic limb condition present from birth in which the fibula is doubled and the foot has a mirror-image extra toe.

Understanding Fibular dimelia-diplopodia syndrome

Fibular dimelia-diplopodia syndrome is a very rare genetic limb condition present from birth with a duplicated fibula bone.

It comes with a mirror-image extra toe (pre-axial mirror polydactyly) on the foot. It may occur alone or with other differences, such as a doubled ulna, facial differences, and a tumor at the base of the spine (sacrococcygeal teratoma).

Signs & symptoms

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

  • Doubled fibula bone
  • Mirror-image extra toes
  • Missing shin bone (tibia)
  • Facial differences
  • Tumor at the base of the spine (sacrococcygeal teratoma)

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
Which orthopedic specialists treat limb differences?
Does my child need imaging for other differences?
Is genetic counseling useful for our family?

Quick facts

Symptoms usually startNewborn

Changes in genes cause it. GARD doesn't name a gene or describe how it is inherited.

Genetic

Also known as: fibular dimelia diplopodia syndrome; leg duplication mirror foot syndrome; leg duplication-mirror foot syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Fibular dimelia-diplopodia syndromeGARD ID 18746 · 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 Fibular dimelia-diplopodia syndrome.

Explore the Fibular dimelia-diplopodia syndrome blog

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Explore actively recruiting Fibular dimelia-diplopodia syndrome studies with HealthSpark.

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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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