1. Hyaluronic acid levels may have predictive value for the progression of knee osteoarthritis 
K. Pavelka, Š. Forejtová, M. Olejárová, J. Gatterová, L. Šenolt, P. Špaček, M. Braun, M. Hulejová, J. Štovı́čková, A. Pavelková 
Osteoarthritis and Cartilage 
Volume 12, Issue 4, Pages (April 2004)
DOI: /j.joca

2. Fig. 1
Correlation between serum hyaluronic acid levels and knee joint space narrowing in patients with OA during 2 years.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )

3. Fig. 2
Correlation between serum pentosidine levels and knee joint space narrowing in patients with OA during 2 years.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )

4. Fig. 3
Correlation between serum COMP levels and knee joint space narrowing in patients with OA during 2 years.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )