The production of trustworthy and reproducible measures for the anterior flexion of the trunk from the seated posture test was described in a study using radiography, performed by Perret
The reproducibility of the distance data, considered as anatomical reference point of the ulnar
styloid process. Rigid support, by means of photography, was performed in a study with elders, which showed high correlations between the measurements taken with the subject and the ones taken using photography
The measurements sampled through photography of the finger to toe distance on the toe-touch photographic assessment was validated byRiehl