Official Journal of the Italian Society of Orthopaedics and Traumatology
Table 1 Luyten’s classification criteria proposal for early knee OA [18]
A. Patient-based questionnaires (KOOS) |
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Two out of the four KOOS subscales need to score “positive” (≤ 85%) |
1. Pain (9 items, including information on pain intensity, frequency and duration) |
2. Symptoms, stiffness (7 items) |
3. Function, daily living (short version: 7 items) |
4. Knee-related quality of life (QOL; 4 items) |
B. Clinical examination |
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At least 1 criterion needs to be present |
Joint line tenderness |
Crepitus |
C. Radiograph |
KL grade 0–I standing, weight-bearing (at least two projections: PA fixed flexion and skyline for patellofemoral OA) |