Baseline characteristics.
pain, KOA
Values were presented as mean ± standard deviation; Chi–square tests were used to compare differences in sex, unilateral or bilateral KOA, Kellgren/Lawrence radiographic grade and side of the more affected leg. Independent t–tests were used to compare differences in age, leg length, height, body mass, BMI, and pain score of the more or less affected legs between the PNF and control groups.F, M, U, B, R, L, I, II, and III represent the abbreviation of female, male, unilateral, bilateral, right, left, I grade, II grade and III grade, respectively.