Objective: Angle formed by the line perpendicular to the Frankfurt plane and the medial longitudinal axis of the ear (the two most remote points of the ear) greater than 2 SD above the mean for ageComments:
Normal values are available [Farkas, ; Hall et al., ]. The mean angle is near 20? used the Frankfurt plane is compromised if the ear is also low-set. Subjective assessment of ear rotation is unacceptable because it is unreliable and often confounded by changes in head position. Abnormalities of ear shape may make it difficult to reliably determine the medial longitudinal axis of the ear. In such cases, it is probably unwise to make an assessment of the rotational status of the ear.