“…This is evidenced by the geometric analysis of the principal components, where the rigid-body translation and rotation components were much larger than the deformation components. As such, we believe that techniques focused on addressing marker cluster deformation [7,10,12,13,15,16] will have limited impact on resolving the STA problem. In a bone pin study on three Marino-mix sheep, Taylor et al [16] suggested that a large amount of STA is caused by rigid-body motions of the soft tissue, similarly to what was found in our study.…”