Ankle arthritis - an important signpost in rheumatologic practice

Area of Science:

• Rheumatology
• Orthopedics
• Clinical Medicine

Background:

• Ankle arthritis serves as a crucial diagnostic indicator in rheumatic diseases.
• Unique biomechanical and cartilage properties may protect the ankle joint compared to the knee.
• Ankle osteoarthritis (OA) prevalence is low, often resulting from trauma.

Purpose of the Study:

• To provide a comprehensive overview of ankle arthritis differential diagnosis.
• To explore the etiological factors and diagnostic approaches for various ankle arthritides.
• To distinguish true ankle joint involvement from periarticular conditions.

Main Methods:

• Review of clinical presentations and etiological factors of ankle arthritis.
• Comparison of ankle joint characteristics with other joints like the knee.
• Analysis of differential diagnoses for inflammatory, degenerative, and infectious arthropathies.

Main Results:

• Primary ankle OA warrants investigation for underlying causes such as hemochromatosis.
• Inflammatory mono/oligoarthritis of the ankle is more commonly undifferentiated arthritis or spondyloarthritis than rheumatoid arthritis (RA) or crystal-induced arthropathies (gout vs. CPPD).
• Septic arthritis of the ankle is frequently bacterial, viral (chikungunya, HIV), but rarely tuberculous. Periarticular swelling can mimic ankle arthritis.

Conclusions:

• Accurate diagnosis of ankle arthritis requires consideration of its unique pathophysiology.
• Differentiating between primary OA, inflammatory conditions, septic arthritis, and mimics is essential for effective management.
• Understanding the prevalence and typical causes of ankle arthritis guides clinical investigation.