The hypothesis that ceratopians had sprawling forelimbs since they had bipedal ancestors is very unlikely : the strides would have been of different lengths, and they would have been going doing somersaults. Moreover, this is in contradiction with the evidence from fossil tracks.
However, it seems that ceratopian forelimbs were slightly more leaning than usual, due to particular skeletal constraints. : the humerus cannot go far forwards. This may preclude any fast running. Yet (supposed ceratopian) tracks are quite narrow, and it has been suggested that the shoulder could have moved more easily to balance the lack of mobility of the arm.
A running Triceratops?
