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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
  1. K&L Kellgren and Lawrence score; OA Osteoarthritis; PA Posteroanterior; PFJ Patellofemoral joint; TFJ Tibiofemoral joint