Joint effusion by joint fluid type

Joint effusion by joint fluid type is a topic covered in the Diagnosaurus.

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Peripheral Vascular Disease

Abdominal pain, right lower quadrant

Arterial blood gases

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Etiology

Group I: Noninflammatory (200-300 WBC, < 25% PMNs)

Osteoarthritis
Trauma (may be hemorrhagic)
Osteochondritis dissecans
Osteochondromatosis
Neuropathic arthropathy (may be hemorrhagic)
Subsiding or early inflammation
Hypertrophic osteoarthropathy (group I or II)
Pigmented villonodular synovitis (may be hemorrhagic)

Group II: Inflammatory (3000-50,000 WBC, >50% PMNs)

Rheumatoid arthritis
Gout or pseudogout
Reactive arthritis (Reiter’s syndrome)
Ankylosing spondylitis
Psoriatic arthritis
Arthritis accompanying inflammatory bowel disease
Rheumatic fever (group I or II)
Systemic lupus erythematosus (group I or II)
Scleroderma (group I or II)
Tuberculosis
Mycotic infection

Group III: Purulent (>50,000 WBC, >75% PMNs)

Pyogenic bacterial infection

Hemorrhagic

Hemophilia or other bleeding disorder
Trauma with or without fracture
Neuropathic arthropathy
Pigmented villonodular synovitis
Synovioma
Hemangioma and other benign neoplasms

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