1. Joint space width of the tibiofemoral and of the patellofemoral joint in chronic knee pain with or without radiographic osteoarthritis: a 2-year follow-up 
T.L Boegård, M.D., Ph.D., O Rudling, M.D., I.F Petersson, M.D., Ph.D., K Jonsson, M.D. 
Osteoarthritis and Cartilage 
Volume 11, Issue 5, Pages (May 2003)
DOI: /S (03)00030-X

2. Fig. 1 The flow from sample of population at baseline to study cohort.
Osteoarthritis and Cartilage  , DOI: ( /S (03)00030-X)

3. Fig. 2
The position for obtaining the flexed PA view of the TF joint (after Boegård et al.8 with permission from Acta Radiol).
Osteoarthritis and Cartilage  , DOI: ( /S (03)00030-X)

4. Fig. 3
The position for obtaining the axial view of the PF joint (after Boegård et al.10 with permission from Acta Radiol).
Osteoarthritis and Cartilage  , DOI: ( /S (03)00030-X)