This is rheumatology decision tool.
Articular vs Nonarticular Characteristics

1. Anatomic Structures: Juxtaarticular bone, Articular cartilage, Intraarticular ligaments, Menisci (knee), Synovial fluid, Synovium, Joint capsule
2. Symptoms and Signs
a. Pain/tenderness: Localized to joint, Deep and poorly localized, Specific referral patterns
b. Pain on Movement: With active and passive movement, With movement in many planes, Localized to joint
c. Swelling: Common, Related to articular structure; Synovial effusion, Synovial thickening, Bony enlargement
d. Limitation of Motion: Frequent on both passive and active range of movement, Related to mechanical derangement or joint pain
e. Crepitation: May be present
f. Instability: May be present
g. Locking of joint: May be present
h. Deformity: May be present, Localized to joint, Secondary to joint damage
3. Radiographic changes: Common in chronic conditions, Uncommon in acute conditions except trauma
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