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Fig. 5. Angles of the knee, ankle, femur rotation, femur retraction and femur depression, versus time for one stride of a single individual on a 1 cm (A–C) and 10 cm (D–F) diameter perch inclined at 0° (A,D), 45° (B,E) and 90° (C,F). Footfall occurred at 0%, and the vertical broken line represents the end of stance.