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Table 2 Proportion (%) of people with radiographic knee OA in populations with knee pain according to the definition of knee pain.

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

Study % Radiographic OA in those
with Knee pain
Definition of knee pain positive subjects
Hannan [25] 15 Pain, swelling, morning stiffness in or around the knee on most days for one month
   Positive response to both parts required:
Lanyon [8] 30 (A) Have you ever had pain in or around the knee on most days for one month?
McAlindon [15] 53  
McAlindon [17] 76  
Lethbridge [10] 53 (B) If so, have you experienced pain in the last year?
Felson [20] (Part A only) 16  
Cicuttinni [11] 37 Ever having an episode of knee pain
Cicuttinni [26] 30 Ever having an episode of knee pain lasting more than 15 days
Peterson [19] 15 Pain in your knees practically daily for the last 3 months
Lachance [13] 15 (CA)
40 (AA)
Any joint pain in their knees during the last during the last month
Hart [18] 19 Pain, stiffness and swelling lasting more than a month
Odding [14] 39 Knee pain during the past month
Jordan [35] N/A Knee pain on most days
Davis [27] N/A Knee pain on most days lasting for one month in the past year
Williams [21] N/A  
Brandt [24] N/A  
Ang [23] N/A  
  1. CA – Caucasian, AA – African American, N/A – not applicable.