Powell and Humphreys Method

The Powell and Humphreys Method is one approach used to evaluate nasal tip projection in facial analysis.¹
1. Nasal height is defined by the line from the nasion (N) to the subnasale (Sn).
2. Tip projection is defined by a perpendicular line from N-Sn that passes through the nasal tip.
In the Powell and Humphreys method, the ideal ratio between nasal height and tip projection is 2.8 : 1.²³

Powell and Humphreys method for evaluating nasal tip projection

Methods for assessment of tip projection
	Goode Method Nasal length is measured from nasion (N) to tip (T). A second line is drawn from the nasion (N) to the alar crease (AC) Nasal projection is measured using a perpendicular line from N-AC that passes through the nasal tip (T) The ideal ratio between nasal projection and nasal length is *0.55-0.6 : 1*
	Powell and Humphreys Method Nasal height is measured from nasion (N) to subnasale (Sn). Tip projection is measured using a perpendicular line from N-Sn that passes through th e nasal tip. The ideal ratio between nasal height and tip projection is *2.8 : 1*
	Simons Method Basal length is measured from subnasale (Sn) to the nasal tip (T). Upper lip height is measured from subnasale (Sn) to vermillion border (V) The basal length and upper lip height should be approximately equal.
	Crumley and Lanser Method Nasal length is measured from nasion (N) to tip (T). A second line is drawn from the nasion (N) to the alar crease (AC) Nasal projection is measured using a perpendicular line from N-AC that passes through the nasal tip (T) The right angle triangle formed by the above 3 lines should ideally have a *3:4:5 ratio*

Methods for assessment of nasal tip projection: Goode method, Powell and Humphreys Method, Simons Method, Crumley and Lanser Method

Powell, Nelson, and Brian Humphreys. Proportions of the aesthetic face. Thieme medical pub, 1984. ↩
Crumley, Roger L., and Michael Lanser. “Quantitative analysis of nasal tip projection.” The Laryngoscope 98.2 (1988): 202-208. ↩
Bailey, Byron J., et al. “Chapter 170: Preoperative Evaluation and Facial Analysis in Facial Plastic Surgery.pdf.” Bailey’s Head and Neck Surgery - Otolaryngology, 5th ed., Wolters Kluwer, Lippincott Williams Et Wilkins, 2014. ↩

Last updated December 10, 2022