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Table 1 Proportion (%) of patients who have radiographic osteoarthritis in specified age-groups of populations with knee pain.

From: The discordance between clinical and radiographic knee osteoarthritis: A systematic search and summary of the literature

Study Age Group Radiographic View Proportion (%) OA Definition Population
Petersson [19] 31–54 A/Pwb 15 Ahlb ≥ 1 All
     K&L 2+  
Lachance [13] 40–53 A/P 15 K&L 2+ CA
    40   AA
Hart [18] 45–65 A/Pwb 19 K&L 2+ All
Hannan [25] 51–74 A/P 15 Def Ost All
Lanyon[8] 40–80 A/Pwb + S/L Grade 1+ 63% Altman All
    Grade 2+ 30% ≥ Grade I  
    Grade 3 12% Ost [32]  
Claessens [3] > 45 A/Pwb 36 K&L 2+ All
Cicuttini [11] > 45 Lateral Flexed wb 30 Def Female
   S/L 53 Ost Female
Cicuttini [26] > 45 A/Pwb 37 Ost Female
   Lateral 37 JSN Female
   S/L 51 or both Female
Odding [14] > 55 A/Pwb 39 K&L 2+ All
McAlindon [17] > 55 A/Pwb + Lateral 76 K&L 2+ All
Brandt [24] > 65 A/Pwb + Lateral 49 K&L 2+ All
Lethbridge [10] 19–92 A/P KL 2+ 53% K&L 2+ All
    KL 3+ 22%   
    KL 4 2%   
Williams [21] 51–80 A/Pwb + Lat Flexed 43 K&L 2+ All
  1. A/P – antero-posterior
  2. wb – weight bearing
  3. S/L – skyline view
  4. Lat – lateral
  5. CA – Caucasian
  6. AA – African American
  7. All – whole population
  8. K&L – Kellgren & Lawrence Knee OA Grading Scale [33]
  9. Ahlb – Ahlbäck Knee OA Grading Scale [34]
  10. Ost – Osteophytes
  11. Def Ost – Definite Osteophytes
  12. JSN – Joint Space Narrowing