Fig. 2From: Runners with patellofemoral pain demonstrate sub-groups of pelvic acceleration profiles using hierarchical cluster analysis: an exploratory cross-sectional studyTime-normalized pelvic accelerations. a Vertical acceleration, (b) Anteroposterior acceleration, and (c) Mediolateral acceleration for males and female sub-groups C1 and C2 during stance phase (1%–80%) and flight phase (81%–100%; gray area) of running. Regions represented by the significant principal components are indicated in the graphsBack to article page