Which physical finding is included in ACRR criteria for knee OA?

• A. Bony tenderness
• B. Warmth
• C. Effusion
• D. Redness

Answer: (A)

In knee OA classification, one key clinical finding included in the criteria is bony tenderness over the knee. This reflects the degenerative changes that affect the bone surfaces and periarticular areas. Warmth, by contrast, signals inflammation and is not part of the OA criteria. The criteria actually combine features such as age over 50, morning stiffness under about 30 minutes, crepitus, bony tenderness, bony enlargement, and the absence of warmth, with three of these features helping to classify OA. So, bony tenderness is the finding that fits the criteria, while warmth and other signs are not used as core OA criteria.