What is Klippel-Feil Syndrome
Klippel-Feil syndrome (KFS) is a rare congenital disorder characterized by abnormal fusion of two or more cervical vertebrae, resulting in limited neck mobility and a constellation of associated anomalies. 1, 2
Core Pathophysiology
The hallmark feature is congenital cervical vertebral fusion, which occurs during embryological development 3. The etiology remains incompletely understood, though the condition is now recognized as more prevalent than historically described 3.
Clinical Presentation
Classic Triad (Not Always Present)
The traditional clinical triad includes:
- Shortened neck
- Low posterior hairline
- Limited cervical range of motion
Important caveat: Not all patients exhibit all three features of the triad 1. Many patients may present with only one or two components, making clinical suspicion critical.
Associated Manifestations
KFS is a multisystem disorder with diverse presentations:
Musculoskeletal:
- Scoliosis
- Sprengel's deformity (elevated scapula)
- Hypermobility in non-fused cervical segments leading to adjacent segment disease 3
Otolaryngological: 2
- Hearing loss
- Dysphagia
- Cleft palate
- Jaw disorders
- Thyroid abnormalities
- Ear malformations
Cardiovascular:
- 72% of cases report congenital heart disease 4
- Various cardiac defects and abnormalities
Neurological:
- Chronic neck pain
- Limb numbness or weakness
- Potential for myelopathy or radiculopathy 5, 3
- May coexist with Chiari 1 malformation 5
Spinal cord malformations:
- Can be associated with split cord malformations, particularly in certain cases 6
Classification
The Samartzis classification system is used to categorize vertebral fusion patterns, with Type III representing the most extensive fusion profile and correlating with more severe symptoms 2, 4.
Clinical Implications
Risk Stratification
- Patients with craniocervical abnormalities and upper cervical instability are at increased risk for spinal cord injury after minor trauma and should avoid contact sports 3
- More severe vertebral fusions correlate with more serious symptoms 2
- Hypermobility in non-fused segments may lead to disc herniation and myelopathy after minor trauma 3
Management Approach
Most patients are asymptomatic and can be managed nonoperatively 3.
Conservative management indications:
- Patients without neurological deficits
- Includes corrective collar, cervical traction, and targeted physiotherapy 7
Surgical intervention reserved for:
- Pain refractory to medical management
- Instability
- Myelopathy or radiculopathy
- Severe adjacent segment disease 3
Diagnostic Considerations
Clinicians should maintain high suspicion for KFS when patients present with:
- Neck masses and pain
- Hearing loss
- Dysphagia
- Scoliosis
- Sprengel's deformity
- Other musculoskeletal abnormalities 2
Screening recommendations: