Juvenile ankylosing spondylitis

Area of Science:

• Rheumatology
• Pediatric Rheumatology
• Immunogenetics

Background:

• Ankylosing spondylitis (AS) is a chronic inflammatory disease primarily affecting the axial skeleton.
• Juvenile-onset AS (JAS) presents unique diagnostic challenges, often differing from adult-onset disease.
• Early identification is crucial for managing long-term outcomes in pediatric patients.

Purpose of the Study:

• To characterize the clinical and radiographic features of juvenile ankylosing spondylitis.
• To differentiate JAS from other pediatric rheumatic conditions, particularly juvenile rheumatoid arthritis.
• To evaluate the prevalence of HLA B27 in affected children.

Main Methods:

• Retrospective review of clinical histories and radiographs.
• Analysis of presenting symptoms, disease progression, and joint involvement.
• Radiographic assessment of spinal and appendicular joints.
• HLA B27 antigen testing in a subset of patients.

Main Results:

• All 28 patients developed symptoms before age 17.
• Appendicular joint complaints were more common presenting symptoms than low back pain.
• The disease showed progressive spinal and sacroiliac joint involvement, with severe appendicular joint changes.
• HLA B27 antigen was positive in 8 of 9 tested patients.

Conclusions:

• Juvenile ankylosing spondylitis typically manifests in early adolescence with peripheral joint symptoms.
• Progressive axial and peripheral joint involvement is characteristic.
• Distinguishing JAS from juvenile rheumatoid arthritis requires comprehensive evaluation, including radiographic and laboratory findings.