Osteoarthritis of the Knee: Sensitivity and Specificity

Introduction: None written.

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Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
Visits to Primary Care for Knee Pain	34%	Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229
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The sensitivity and specificity of findings for Osteoarthritis of the Knee are listed below. See the left navigation bar to change the display.

Specific Findings

ACR Criteria
Duplicate

84%

89%

>=4 ACR Criteria: age older than 50 years, stiffness for less than 30 minutes, crepitus, bony tenderness, bony enlargement, and no palpable warmth

Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229

Sensitive Findings

ACR Criteria
Duplicate

95%

69%

>=3 ACR Criteria: age older than 50 years, stiffness for less than 30 minutes, crepitus, bony tenderness, bony enlargement, and no palpable warmth

Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229

ACR Criteria
Duplicate

92%

75%

>=5/9 ACR Clinical + Lab criteria: age older than 50 years, stiffness for less than 30 minutes, crepitus, bony tenderness, bony enlargement, and no palpable warmth, ESR < 40mm/hr, rheumatoid factor < 1:40, synovial fluid clear and viscous with leukocytes < 2x10^9/L

Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229

Poorly Diagnostic Findings

Osteophytes

77%

83%

on X-ray

Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229