Effusion | Common (warmth) | Common (warmth and erythema) | Common (warmth) | Common (warmth and erythema) |
No. of joints involved | Monoarticular (63%) ≥ 2 Active joints (27%) | Monoarticular (80% to 90%) | Oligoarticular Monoarticular | Oligoarticular (50% to 60%) Polyarticular (15% to 25%) |
Most commonly involved joints | Knee (> 90%) Ankle (25%) Knee and ankle (56%) | Knee (> 50% in adults) Hip (15% in adults) | Hip Knee Ankle | Knee Wrist Ankle |
Refusal or inability to weight bear | Uncommon | Common | Common | Uncommon |
Pain with passive range of motion | Mild | Severe | Moderate to severe | Mild to moderate |
Fever (> 38.5°C) | Uncommon | Common | Uncommon | Uncommon |
Rash | Might have remote history; rash not concurrent with arthritis (erythema migrans) | Common (localized redness of affected joint) | Common (erythema nodosum, keratoderma blennorrhagicum) | Uncommon |