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Living with Spondylometaphyseal dysplasia, Kozlowski type

A genetic bone condition with a short trunk, bow legs, a waddling walk, and early joint wear.

Understanding Spondylometaphyseal dysplasia, Kozlowski type

Spondylometaphyseal dysplasia, Kozlowski type is a bone condition that causes short stature mainly in the trunk.

It usually starts in early childhood with poor growth, bow legs, and a waddling walk. Early arthritis is common. Hands and fingers are small, and the spine may be curved. X-rays show short spine bones and changes in the pelvis and hips.

Signs & symptoms

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

  • Severe short stature with a short trunk
  • Bow legs (genu varum)
  • Early arthritis
  • Curved spine (scoliosis)
  • Short fingers and toes
  • Flattened spine bones (platyspondyly)

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. Consider genetic testing

    Changes in TRPV4 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  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); 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
How can we monitor the legs, hips, and spine?
What can help protect the joints from early wear?
Would TRPV4 gene testing help our family?

Quick facts

Symptoms usually startInfant
InheritanceAutosomal Dominant
GenesTRPV4

Changes in the TRPV4 gene cause this condition. It is autosomal dominant, meaning one changed copy of the gene can cause it.

Genetic

Also known as: dysmorphism arthrogryposis skeletal maturation advanced; jequier-kozlowski syndrome; kozlowski spondylometaphyseal dysplasia; skeletal dysplasia jequier-kozlowski type; smd kozlowski type; smdk

Patient organizations

Source: NIH GARD · Spondylometaphyseal dysplasia, Kozlowski typeGARD ID 3047 · 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 Spondylometaphyseal dysplasia, Kozlowski type.

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