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. 2015 Oct 8;3:e1272. doi: 10.7717/peerj.1272

Figure 2. Predicted pelvic muscle moment arms for hip flexion-extension (left), and corrected data for abduction–adduction (centre) and long-axis rotation (right) in key muscle groups (A) ADD1, (B) CFB, (C) CFL, (D) IF, (E) PIFE1, (F) PIFI2 and (G) PIT over a range of hip joint flexion-extension angles.

Figure 2

All data normalized by femoral length. Only flexion-extension data are available for Tyrannosaurus and Velociraptor from previous studies (Hutchinson et al., 2005; Hutchinson et al., 2008), while PIT is present only in Poposaurus and Alligator, having been lost in ornithodirans.