Impact of Dorsal Preservation Rhinoplasty on the Internal Nasal Valve

Alharthi RS, Alshahrani MA, Rajab RH, Mogharbel AM, Bahabri MA, Rajab MH, Aytah AZ, Aytah MZ.

PubMed 41907079 Publisher (DOI)Free full text (PMC)

What this paper says

Pooling four clinical studies (118 patients), dorsal preservation slightly widened the internal nasal valve angle, with cadaver data suggesting the spare-roof and let-down variants widen it most and push-down may not.

Overview

The internal nasal valve is the narrowest part of the airway. Whether lowering the intact bridge narrows it is a live question. The authors searched PubMed and Google Scholar to April 2025 for studies reporting valve angles before and after preservation rhinoplasty and pooled them in RevMan following PRISMA.

Sections of note

Nine studies met criteria; four clinical studies (N = 118) were pooled.
Postoperative valve angle increased: SMD 0.52 (95% CI 0.02-1.02; P = 0.04; I-squared 63%).
Removing one outlier: SMD 0.43 (95% CI 0.16-0.69; P = 0.002) with 0% heterogeneity.
Cadaver analysis (N = 46): spare roof widened most (SMD 1.42; P = 0.02); push-down showed a nonsignificant decrease (SMD -1.65); let-down a nonsignificant increase (SMD 0.86).
Technique subgroup differences were significant (P = 0.02).

What it means for a patient

On pooled evidence, preservation surgery did not narrow the valve and on average opened it modestly.
The specific variant matters: spare-roof and let-down looked better for the valve than push-down.
The clinical data are small (118 patients), so this is a preliminary answer.

Why this paper matters

It is the first meta-analysis on the valve-angle question in preservation rhinoplasty and distinguishes between sub-techniques. Limits: few small studies, cadaver data mixed with clinical, angle measurement is a surrogate for breathing.

Terms

Internal nasal valve (INV): the angle between the septum and the upper lateral cartilage, normally 10-15 degrees.
Push-down: impacting the freed bony vault inward and downward.
Let-down: removing a strip of bone at the base of the vault so it drops.
Spare roof: a variant that removes the cartilaginous hump while sparing the bony roof.
Standardised mean difference (SMD): a unit-free effect size.

Summary written by rhinoplasty.cc from the abstract, 2026-09-08; not medical advice. The authors' own abstract follows.

Abstract

Background: The internal nasal valve (INV) is the airway's narrowest segment and main regulator of nasal resistance. Dorsal preservation rhinoplasty (DPR)-push-down (PD), let-down (LD), and spare roof (SR)-preserves dorsal structures, but its effect on INV angle is unclear. This study systematically evaluated INV angle changes after DPR.

Methods: We searched PubMed and Google Scholar (through April 2025) for studies reporting pre- and postoperative INV angles in DPR. Data were synthesized in RevMan 5.4 following PRISMA guidelines. The primary outcome was a change in the INV angle.

Results: Nine studies met inclusion criteria; 4 clinical studies (N = 118) were pooled. Meta-analysis showed a significant postoperative INV angle increase (standardized mean difference [SMD] = 0.52; 95% confidence interval [CI]: 0.02-1.02; P = 0.04; I 2 = 63%). Removing 1 outlier reduced heterogeneity to 0% and preserved significance (SMD = 0.43; 95% CI: 0.16-0.69; P = 0.002). Cadaveric analysis (N = 46) demonstrated the greatest INV widening with SR (SMD = 1.42; P = 0.02); PD showed a nonsignificant decrease (SMD = -1.65; P = 0.15), and LD showed a positive, nonsignificant trend (SMD = 0.86). Technique-based subgroup differences were significant (P = 0.02).

Conclusions: SR and LD techniques provide modest but meaningful INV angle improvement, supporting DPR as a functional alternative to traditional dorsal hump reduction. PD appears less reliable for valve patency. Larger, long-term studies with standardized functional measures are needed to refine technique selection.

Abstract as indexed by PubMed; the article is open access (PubMed Central).