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Table 4 Proportion (%) of patients experiencing knee pain in specified age-groups of populations with radiographic osteoarthritis.

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
Lachance [13] 40–53 A/Pwb 35 K&L 2+ CA
    50   AA
Hart [18] 45–65 A/Pwb 56 K&L 2+ All
Davis [27] 45–75 A/Pwb 41(KL2) K&L I+ All
    59(KL3)   All
Hannan [25] 51–74 A/P 47 Def Ost All
Claessens [3] > 45 A/Pwb 24 K&L 2+ All
Cicuttini [11] > 45 Lateral Flexed wb 16 Def Ost Female
   S/L 26   Female
Cicuttini [26] > 45 A/Pwb 20 Ost Female
   Lateral 15 JSN Female
   S/L 23 or both Female
Odding [14] > 55 A/Pwb 30(KL2) K&L 2+ All
    59(KL3)   
Felson [20] > 63 A/Pwb 40 K&L2+ All
     or JSN  
Brandt [24] > 65 A/Pwb + Lateral 22 K&L2+ All
Lethbridge [10] 19–92 A/P 30(KL2) K&L2+ All
    64(KL3)   
Williams [21] 51–80 A/P Lat Flexed 79 K&L2+ All
Lanyon [8] 40–80 A/Pwb + S/L 81 Altman All
     ≥ Grade I Ost [32]  
  1. A/P – antero-posterior
  2. wb – weight bearing
  3. S/L – skyline
  4. Lat – lateral
  5. CA – Caucasian
  6. AA – African American
  7. KL – Kellgren Lawrence grade
  8. All – whole population
  9. K&L – Kellgren & Lawrence Knee OA Grading Scale [33]
  10. Ost – Osteophytes
  11. Def Ost – Definite Osteophytes
  12. JSN – Joint Space Narrowing