Second, the generalizability of the findings is somewhat limited because samples in both studies included only men and all participated in a professional sport. Third, the FABERE test is a measure of the combined amount of available passive hip abduction, lateral rotation and extension motion rather than a specific measure of hip lateral rotation. The extent to which differences in hip lateral rotation rather than differences in hip abduction or extension contributed to the side to side differences obtained with the FABERE test is unknown. Finally, Vad et al. compared hip mobility within each group (LBP or NoLBP) but did not compare hip mobility between groups. Thus, the investigators do not directly examine whether or not the LBP group had less overall hip rotation motion compared to the NoLBP group.