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Living with Spondyloepiphyseal dysplasia tarda, Kohn type

A rare bone condition with a short trunk, spine and joint changes, and mild to moderate learning difficulty.

Understanding Spondyloepiphyseal dysplasia tarda, Kohn type

Spondyloepiphyseal dysplasia tarda, Kohn type is a rare bone condition with a short trunk and learning difficulty.

People have short stature with a short trunk. The spine and the ends of the long bones are increasingly affected over time. GARD also lists mild to moderate intellectual disability. Signs may begin in childhood.

Signs & symptoms

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

  • Short stature with a short trunk
  • Flattened spine bones (platyspondyly)
  • Stiff large joints
  • Hip, knee, and ankle bone differences
  • Pelvis bone differences
  • Mild intellectual disability

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, brain and nervous system specialists and genetic specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    Little People of America may keep lists of experts for this condition.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: Little People of America
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 Little People of America
  • 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 learning supports could help my child?
How can we monitor the spine and joints over time?
Is genetic testing available for our family?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Recessive

Changes in genes (variants) cause this condition. It is autosomal recessive, meaning a child inherits a changed copy of a gene from each parent. GARD doesn't list which gene.

GeneticNeurological

Patient organizations

Source: NIH GARD · Spondyloepiphyseal dysplasia tarda, Kohn typeGARD ID 16995 · 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 Spondyloepiphyseal dysplasia tarda, Kohn type.

Explore the Spondyloepiphyseal dysplasia tarda, Kohn type blog

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  • Eligibility is confirmed by the study team

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