Joints:

• RA: MCP>PIPwrist.
• OA: DIP>PIPspinehipknee.
• AnS: sacroiliac jointsneck.

Classic deformities:

• RA: swan neckulnar deviationwrist subluxationBoutonniere's deformity.
• OA: Heberden'sBouchard's nodes.
• AnS: neck hyperextensionkyphosisspinocranial ankylosis.

Morning stiffness:

• RA: >30min.
• OA: <30 min.

ESR:

• RA: increased.
• OA: normal.
• AnS: increased in 50% of pts.

Rheumatoid factor:

• RA: (+) in 70% of pts.
• OA: (-).
• AnS: ? 

NSAID response:

• RA: usually some relief.
• OA: variable relief.
• AnS: variable relief

Treatment:

• RA: OT/PTNSAIDsgoldpenicillimineetc.
• OA: paracetamolweight lossjoint replacementexercise.
• AnS: exercise instead of rest for backacheNSAIDs.

Imaging:

• RA: juxta-articular osteroporosiserosions.
• OA: osteophyteseburnationreduced joint space.
• AnS: lumbar vertebrae squaringsacroilitisbamboo spine.

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