Superimposition Study to Determine the Angular Arterial Distribution and its Clinical Application

Background: The purpose of this study was to determine the distribution of the angular artery (AA) in the medial canthal area with the aim of defining an arterial course to prevent AA injury during facial surgery in this region. Methods: The authors dissected 36 hemifaces of 18 cadavers. The horizontal distance from the vertical level through the medial canthus to the AAs was measured. The AA course of each specimen was then recorded, and all of them were then superimposed to determine the AA course. The diameter and depth of the AA around the medial canthal area were also investigated using ultrasonography on living subjects. Results: The horizontal distances from the medial canthus level and 2 cm below the medial canthus were 9.0 ± 2.0 mm (mean ± SD) and 1.9 ± 2.4 mm, respectively. The superimposed image demonstrated that most of the AAs were present inside the vertical line through the medial canthus. Ultrasonography indicated that the AA was 2.3 ± 0.9 mm below the skin and 1.7 ± 0.3 mm in diameter. Conclusions: The AA course was relatively constant along the nasojugal fold. The AAs were most often present between the middle of the medial canthus and the facial midline, but were very scarce in both the medial and lateral thirds. Knowledge of the detailed course of the AA may help surgeons to avoid arterial injury and decrease the risk of surgical morbidities around the nasal root and medial canthal area.