Fig. 2From: Relationship between the presence of abnormal hallux interphalangeal angle and risk of ingrown hallux nail: a case control studyAssimmetry angle: A tangent was drawn to the articular surface of the distal phalangeal base (a, b). A perpendicular line (c, d) was then extended from the longitudinal bisection of the distal phalanx. Assymmetry is the angular relationship between this perpendicular line and the above mentionated tangent (ABC)Back to article page