1. Association of knee pain with a reduction in thigh muscle strength – a cross-sectional analysis including 4553 osteoarthritis initiative participants 
A. Ruhdorfer, W. Wirth, F. Eckstein 
Osteoarthritis and Cartilage 
Volume 25, Issue 5, Pages (May 2017)
DOI: /j.joca
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
Scatterplots showing the association between age (X axis) and knee extensor strength (Y axis) for in women (A) and in men (B) and that between age and isometric knee extensor torque per body weight in women (C) and men (D).
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Scatterplots showing the association between the WOMAC knee pain score (range 0–20; 20 = worst pain; X axis) and age-adjusted knee extensor strength (Y axis) in women (A) and in men (B) and that of age-adjusted isometric knee extensor torque per body weight in women (C) and men (D).
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions