Differential diagnosis of some systemic causes of arthritis

	Gonococcal arthritis	Reactive arthritis (formerly Reiter's syndrome)	Rheumatoid arthritis	Psoriatic arthritis
Age	Young	Young	Middle	Middle
Gender	Female>male	Male>female	Female>male	No effect
Onset	Abrupt	Abrupt	Insidious	Insidious
Joint number	Monoarthritis or oligoarthritis	Oligoarthritis	Polyarthritis	Oligoarthritis
Symmetry of arthritis	No	No	Yes	No
Sausage digits	No	Yes	No	Yes
Back pain	No	Yes	No	Yes
Urethritis	Yes	Yes	No	No
Skin lesions	Pustular, nodular, or vesicular	Palms and soles in 10 percent	Subcutaneous nodules	Psoriasis
Gonococcus identified on testing	Yes	No	No	No

Graphic 72238 Version 3.0

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