Which age threshold is part of ACRR criteria for knee OA?

• A. Age >60
• B. Age >50
• C. Age >40
• D. Age >55

Answer: (B)

The main idea here is how the ACR knee OA criteria use age as a diagnostic feature. In the ACR criteria, age over 50 is one of the clinical elements that can support a diagnosis of knee osteoarthritis. The criteria require knee pain plus at least three of the six features, which include age over 50, morning stiffness under 30 minutes, crepitus, bony tenderness, bony enlargement, and no warmth. Since the threshold included is 50 years, the age over 50 is the criterion described. Other cutoffs like 60, 40, or 55 aren’t part of the standard ACR knee OA criteria.