Risk factors for atlantoaxial dislocation in rheumatoid arthritis: A comparative study.

Area of Science:

• Rheumatology
• Orthopedics
• Radiology

Background:

• Rheumatoid arthritis (RA) can lead to atlantoaxial dislocation (AAD), a serious complication affecting the upper cervical spine.
• Understanding the clinical and imaging features differentiating RA-AAD from RA without AAD (RA-C) is crucial for timely diagnosis and management.

Purpose of the Study:

• To compare clinical and imaging characteristics of RA patients with and without atlantoaxial dislocation (RA-AAD vs. RA-C).
• To identify factors associated with the development of atlantoaxial dislocation in rheumatoid arthritis patients.

Main Methods:

• Retrospective comparative study of 120 RA patients (78 RA-AAD, 42 RA-C), matched for age, gender, and RA duration.
• Data collected included general information, RA characteristics, AAD features, and treatment modalities.
• Statistical analysis, including multivariate analysis, was used to identify predictive factors for AAD.

Main Results:

• RA-AAD patients exhibited significantly higher rates of rheumatoid factor (RF), extra-articular manifestations (including osteoporosis), coxitis, and higher Disease Activity Score (DAS28) and Health Assessment Questionnaire (HAQ) scores.
• Imaging revealed pathological PADI (<14 mm) in 51.6% and pathological AADI (>3 mm) in 100% of RA-AAD cases, with anterior dislocation being most common (85.4%).
• Multivariate analysis identified coxitis, osteoporosis, high baseline DAS28, and high RF positivity as significant predictors of AAD.

Conclusions:

• Predictive factors for AAD in RA are linked to increased disease activity and structural damage.
• Early detection and aggressive management of RA, focusing on disease control and patient education for treatment adherence, may help prevent AAD.