1. Longitudinal change in thigh muscle strength prior to and concurrent with symptomatic and radiographic knee osteoarthritis progression: data from the Osteoarthritis Initiative 
J. Kemnitz, W. Wirth, F. Eckstein, A. Ruhdorfer, A.G. Culvenor 
Osteoarthritis and Cartilage 
Volume 25, Issue 10, Pages (October 2017)
DOI: /j.joca
Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
Flow chart showing participant selection from the Osteoarthritis Initiative (OAI). BMI, body mass index; BL, baseline; WOMAC, Western Ontario McMasters Osteoarthritis Index; JSW, joint space width; KLG, Kellgren Lawrence grade; JSN, joint space narrowing. *Missing demographic/clinical data is overlapping. # If both knees were eligible, the knee without any symptomatic or radiographic progression was excluded. If other combinations of symptomatic and radiographic progression existed between knees, first the knee with isolated symptomatic progression was excluded, after which the knee with isolated radiographic progression was excluded. If both knees had the same type of progression, the left knee was excluded. This selection criterion was used to maximize the number of knees with both symptomatic and radiographic progression, thereby maximizing study power.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Extensor and flexor strength at BL, Y2, and Y4 for men and women with and without symptomatic progression. †P < 0.05 adjusted for age and body mass index.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions

4. Fig. 3
Extensor and flexor strength at BL, Y2, and Y4 for men and women with and without radiographic progression. †P < 0.05 adjusted for age and body mass index.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions