Table 1 Definitions of subsets of symptomatic radiographic knee OA
From: Clinical features of symptomatic patellofemoral joint osteoarthritis
| 'Any OA' | 'Moderate to severe OA' | |
|---|---|---|
| PFJOA | Skyline K&L ≥2 | Skyline K&L ≥3 |
| OR | OR | |
| Lateral osteophytes ≥1 | Lateral osteophytes = 3 | |
| TFJOA | PA K&L ≥2 | PA K&L ≥3 |
| OR | OR | |
| Posterior osteophytes ≥1 | Posterior osteophytes = 3 |