The Quadrangular Cartilage in Rhinoplasty: A Surgically Focused CT Dimensional Analysis of Black African and Caucasian Populations

Overview

Surgeons report that Black African patients often have little septal cartilage to harvest, but few studies had measured it. The authors, from South Africa and Italy, retrospectively compared the area of the quadrangular (septal) cartilage on sagittal CT views in Black South African and Caucasian samples, using t-tests or Mann-Whitney tests with effect sizes.

Sections of note

• Caucasian samples had about 30% more septal cartilage area than Black African samples.
• The finding confirms the clinically observed relative lack of quadrangular cartilage in Black African noses.
• Effect sizes were reported with Cohen's d thresholds (0.2 small, 0.5 medium, 0.8 large).
• The authors argue preoperative measurement of available septal cartilage is essential for planning grafts.

What it means for a patient

• Patients of Black African ancestry are more likely to need cartilage from the ear or rib because the septum supplies less.
• A CT scan before surgery can tell the surgeon how much septal cartilage exists.
• Sample sizes and exact areas are not given in the abstract.

Why this paper matters

It supplies measured anatomical data for a population almost absent from the rhinoplasty literature. Limits: retrospective, sample sizes unstated in the abstract, single-region African sample.

Terms

• Quadrangular cartilage: the main sheet of cartilage in the nasal septum, the usual first graft source.
• Sagittal CT view: a side-on cross-sectional scan slice.
• Cohen's d: a measure of how large a difference is, independent of sample size.
• Autologous graft: tissue from the patient's own body.