1. Physical Function and Properties of Quadriceps Femoris Muscle in Men With Knee Osteoarthritis 
Tuomas Liikavainio, MD, MSc, Tarja Lyytinen, BM, Erja Tyrväinen, MD, Sarianna Sipilä, PhD, Jari P. Arokoski, MD, DMSc 
Archives of Physical Medicine and Rehabilitation 
Volume 89, Issue 11, Pages (November 2008)
DOI: /j.apmr
Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

2. Fig 1
Physical function tests (mean ± SD) in controls (n range, 52–53) and in men with knee OA (n range, 53–54). The knee OA patients were further divided into 4 subgroups according to the radiographic severity of their knee OA using Kellgren and Lawrence scale37 (Kellgren and Lawrence scores of 1–4). The patients with knee OA exhibited significantly poorer performance than controls in all physical function tests. There were no statistically significant differences between knee OA subgroups in any of the tests. *P<.001 (Student t test for 2 independent samples); †P<.001 (Mann-Whitney nonparametric test); ‡P<.01 (Mann-Whitney nonparametric test).
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

3. Fig 2
WOMAC scores (mean ± SD) in groups with different grades of knee OA. The radiographic grading was made according to the Kellgren and Lawrence scale.37 *P<.05 (Kruskal-Wallis test).
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions