Int. J. Environ. Res. Public Health 2021, 18(2), 753; https://doi.org/10.3390/ijerph18020753 by Jacobo Rodríguez-Sanz Abstract Background: Flexion-rotation test predominantly measures rotation in C1-2 segment. Restriction in flexion-rotation may be due to direct limitation in C1-2, but also to a premature tightening of the alar ligament as a result of lack of movement in C0-1 or C2-3. The aim of […]