Functional Rhinoplasty
Nasal Valve Insufficiency
The nasal valve — the narrowest point of the nasal airway: anatomy, diagnosis, and surgical repair techniques.
Could nasal valve insufficiency be the cause of my nasal obstruction?
Nasal valve insufficiency is a common yet frequently overlooked cause of chronic nasal obstruction. The internal nasal valve — the 10-15 degree angle between the upper lateral cartilage and the septum — is the narrowest point of the airway; narrowing of this angle or inward collapse of the alar cartilages during inspiration causes obstruction. If breathing improves with the simple Cottle manoeuvre (pulling the cheek outward), valve insufficiency is highly likely. The gold standard treatment is spreader grafts for the internal valve and alar batten grafts for the external valve. Iatrogenic valve stenosis after prior rhinoplasty is common and may require revision surgery.
What is the nasal valve and why does it matter?
The nasal valve zone is the narrowest point along the nasal airway, accounting for approximately fifty percent of total nasal airway resistance. Anatomically, two distinct valves are defined: the internal nasal valve is formed at the junction of the upper lateral cartilage (ULC) and the septum and is defined by an angle that should normally measure 10–15 degrees. When this angle falls below 10 degrees, internal valve stenosis is present. The external nasal valve is a broader structure encompassing the alar rim, the lower portion of the alar cartilage, and the floor of the vestibule.
Internal valve stenosis is a primary driver in a significant proportion of chronic nasal obstruction cases. Many patients are treated for years with diagnoses of sinusitis or allergic rhinitis while the underlying valve problem is missed. This risk is particularly high in individuals with a prior rhinoplasty history: dorsal hump removal or excessive cartilage reduction can cause the ULC to approximate the septum, critically narrowing the valve angle.
Causes and diagnosis
Nasal valve insufficiency has four main causes: congenital (an inherently narrow valve angle), iatrogenic (post-rhinoplasty), traumatic (nasal fracture or soft tissue injury), and age-related (loss of alar cartilage support strength). Post-rhinoplasty nasal valve insufficiency is the most frequently encountered functional complaint among patients presenting for revision surgery. After dorsal hump resection, the ULC loses its support and approximates the septum — this situation commonly arises in patients who were operated on without adequate pre-operative valve assessment.
Diagnosis is established by clinical examination. In the Cottle manoeuvre, lateral traction on the cheek opens the internal valve; if nasal airflow improves noticeably, internal valve insufficiency is likely. The nasal valve lateralisation test (modified Cottle) evaluates the alar rim area more specifically. Rhinomanometry and acoustic rhinometry are advanced tools for objectively measuring valve stenosis. Nasal endoscopy is indispensable for directly visualising dynamic collapse during inspiration.
Surgical treatment options
The gold standard for internal nasal valve repair is the spreader graft. Thin rectangular cartilage slices harvested from septal or costal cartilage are placed between the ULC and the septum, reopening the valve angle to the physiological 10-15 degrees while also preserving the dorsal aesthetic lines of the upper third. The butterfly graft is an alternative technique in which a concave cartilage piece is placed on the dorsal septal surface and provides pronounced widening, particularly in severe internal valve stenosis. The LATERA absorbable implant is a polymer support element placed endoscopically and absorbed within six months; it can be applied in an office setting for mild-to-moderate internal valve insufficiency.
For external nasal valve collapse, the alar batten graft is preferred: a firm cartilage segment (usually conchal cartilage) is placed into a pocket just above or below the alar rim to prevent the alar walls from collapsing inward during inspiration. The alar rim graft is a thin cartilage strip that supports the alar margin and is particularly used in cases with concurrent alar edge retraction. The flaring suture technique relies on suture attachment of the ULCs to the dorsal septum to spread them apart and can be combined with a spreader graft for minor internal valve stenosis.
Nasal valve in rhinoplasty planning
In a function-first surgical philosophy, nasal valve assessment is one of the mandatory steps before every rhinoplasty. Every structural change made during rhinoplasty can affect the valve angle; therefore, in addition to the Cottle manoeuvre, endoscopic dynamic valve evaluation should also be standard in pre-operative examination. The prophylactic use of spreader grafts in primary rhinoplasty both prevents post-operative valve stenosis and strengthens the dorsal aesthetic lines.
In revision cases, valve repair constitutes technically the most challenging part: scar tissue masks cartilage planes, graft cartilage may be limited, and anatomical landmarks have changed. For this reason, patients who have had prior rhinoplasty and suffer from chronic nasal obstruction should consult a surgeon with specific experience in valve repair. Prof. Dr. Hasan Ahmet Özdoğan manages revision cases for iatrogenic valve insufficiency in both domestic and international patients, comprehensively applying open technique and a range of grafting strategies.
Frequently Asked Questions
- Mild collapse may be temporarily relieved with nasal dilator strips or splints, but these do not address the underlying structural problem. Permanent meaningful improvement requires surgery.
- Not necessarily, but the risk is elevated. If dorsal hump removal or extensive cartilage reduction was performed, dynamic nasal valve testing should routinely be part of any follow-up examination.
- Spreader grafts are usually performed as part of a broader septorhinoplasty, with a total duration of 2–3 hours. Isolated internal valve repair may take 45–60 minutes. Recovery is similar to other rhinoplasty procedures: 7–10 days with a splint, 3 weeks of social activity restriction.
- Internal valve insufficiency typically presents with a sensation of collapse at the level of the nasal bridge and bilateral obstruction. External valve collapse is characterised by visible inward drawing of the alar wings, especially on deep inspiration. A definitive distinction is made by clinical examination and endoscopy.
- LATERA is a minimally invasive alternative for mild-to-moderate internal valve insufficiency that does not require general anaesthesia. However, in cases where symptoms recur after absorption, permanent surgical options such as spreader grafts are preferred.
References
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