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Adjusted means of year 2 extensor isometric muscle strength (normalized to the individual body weight) in knees with radiographic progression (between year 2 and year 4 [and between year 1 and year 3]), and in knees without radiographic progression (between year 2 and year 4 [or between year 1 and year 3]). The horizontal bars show the lower and upper 95% confidence interval of the adjusted means, respectively.
Rx = radiography, KLG = Kellgren and Lawrence grade.
