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Klippel-Feil syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Klippel-Feil syndrome

Klippel-Feil syndrome is a bone disorder present from birth characterized by the abnormal fusion of two or more spinal bones in the neck.

Overview

Klippel-Feil syndrome involves the abnormal joining (fusion) of cervical vertebrae. The condition is classified into three types based on the number and arrangement of fused vertebrae. While many individuals have no symptoms, others experience significant health challenges.

Symptoms

The three classic features are a short neck, a low hairline at the back of the head, and limited neck range of motion. Other potential symptoms include:

  • Chronic headaches and muscle pain.
  • Torticollis (involuntary neck tensing causing head tilt).
  • Increased risk of spinal cord damage due to neck instability.
  • Narrowing of the spinal canal.
  • Skeletal abnormalities, such as rib defects, scoliosis, or Sprengel deformity (abnormally high shoulder blades).
  • Facial asymmetry, hearing loss, or cleft palate.
  • Heart or kidney abnormalities.
  • Neurological issues, including synkinesia (mirrored involuntary movements).

Causes

Variants in genes such as GDF6, GDF3, and MEOX1 are associated with the condition. These genes are involved in early bone development and the separation of vertebrae. In many cases, the exact cause is unknown, and researchers suspect a combination of genetic and environmental factors, such as disrupted blood flow during development.

Inheritance

Klippel-Feil syndrome is often sporadic. When caused by GDF6 or GDF3 variants, it follows an autosomal dominant inheritance pattern. When caused by MEOX1 variants, it follows an autosomal recessive pattern.

Frequently Asked Questions

Surgery is considered if there is progressive neurologic deficit, spinal cord compression, severe cervical instability, or deformity causing functional limitation. Procedures may include posterior cervical fusion to stabilize the spine, decompression of the spinal canal, or corrective osteotomies. Timing is individualized, often delayed until the child is older than 5 years unless urgent neurologic compromise exists.
Children with Klippel‑Feil should avoid high‑impact contact sports (e.g., football, rugby, gymnastics) and activities that involve rapid neck flexion/extension or heavy lifting, as these increase the risk of spinal cord injury. Low‑impact activities such as swimming, walking, and stationary biking are generally safe, but a cervical‑spine specialist should evaluate any new activity.
Most cases are sporadic, but when a pathogenic variant is identified in GDF6 or GDF3, the inheritance is autosomal dominant with a 50 % chance of transmission to each child. If MEOX1 variants are present, the pattern is autosomal recessive, giving a 25 % recurrence risk for each pregnancy when both parents are carriers. Genetic counseling and testing of at‑risk family members are recommended.
Diagnosis begins with the classic triad (short neck, low posterior hairline, limited neck motion) and is confirmed by imaging. Cervical spine X‑rays show fused vertebrae; CT or MRI provides detailed anatomy and assesses spinal canal width. Additional studies (echocardiogram, renal ultrasound) are often ordered because of associated organ anomalies.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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