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Mean patellofemoral joint compressive force (PFJCF) with ±one standard deviation for each subject (S1–S17), with the blue bars for backward running (BR) and red bars for forward running (FR). The data of the subjects where PFJCF was higher or of similar magnitude in BR compared to FR are circled. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
