Adductors, abductors, and the evolution of archosaur locomotion

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Osteology and phylogeny of a new species of Araripesuchus (Crocodyliformes: Mesoeucrocodylia) from the Late Cretaceous of Madagascar (2006, background): “The function of PIFI 1 remains ambiguous, although it appears to create (along with PIFI 2) some ancillary whole-limb adduction during the swing phase in modern crocodylians (Hutchinson and Gatesy 2000 ).”
The Locomotor Musculature of Basal Ornithischian Dinosaurs (2011, methodology): “Hutchinson and Gatesy (2000) and Hutchinson (2001a) elaborated on this, considering that PIFE 1 and 2 were homologous to the obturator lateralis and medialis, respectively.”
The Bipedal Stem Crocodilian Poposaurus gracilis: Inferring Function in Fossils and Innovation in Archosaur Locomotion (2011, background): “…could thus, at least at low speeds on land, perform a “high walk” in which the hindlimbs swung in a more parasagittal plane closer to the center of mass, with the knees and foreshortened toes pointing forward throughout the step cycle (Gatesy 1991; Hutchinson and Gatesy 2000; Reilly et al. 2005).”
The Appendicular Skeleton of Neuquensaurus, a Late Cretaceous Saltasaurine Sauropod from Patagonia, Argentina (2010, background): “In Neornithes, the ischial tuberosity shifts toward the proximodorsal process of the ischium, representing another character state for the same feature, and maintaining the muscular correlate (Hutchinson 2001a, 2002).”