Septoplasty and the nasal valve — The pillar that holds the nose and the zone that decides breathing
The septum as a structural pillar rather than a wall, the L-strut rule and what the evidence says about it, conservative techniques versus resection, and treatment of the internal and external valve with spreaders, autospreaders and alar grafts.
Content intended for healthcare professionals. It does not replace clinical assessment and is not written as patient information.
Key points
- The septum is not a wall, it is a pillar: it holds up the dorsum and the tip. Any manoeuvre on it is planned knowing what structural load the remaining part will carry.
- You operate on what you have localised. The Cottle areas exist for that: treating a vomerine spur has nothing to do with treating a caudal deviation.
- The classic rule is to leave an L-strut of 1 cm dorsally and 1 cm caudally. It is a minimum, not a target: the biomechanical work that tested it found that below 9-10 mm the strut loses rigidity markedly, so in practice more is left.
- Obstruction is not only septal. The internal nasal valve is the point of greatest resistance in the whole airway, and classic series identify it as the most commonly overlooked cause in the patient still breathing poorly after rhinoplasty.
- Opening the dorsum creates an open roof and destabilises the upper lateral–septal junction. Closing it with spreaders or with the upper lateral folded on itself is not an extra: it is part of the dorsal reduction.
What the septum is and why it is operated on with respect
The septum is a vertical plate that divides the two fossae, regulates airflow and supports the nasal pyramid. Anteriorly it is cartilaginous — the quadrangular cartilage — and posteriorly bony: the perpendicular plate of the ethmoid above and behind, the vomer below and behind. Below and in front, the membranous septum joins it to the medial crura in the columella and to the anterior nasal spine. That last sentence is why septoplasty is not mucosal surgery: what is handled there holds up the tip. If caudal support is lost, what follows is retraction of the columellar-labial angle, tip ptosis and external valve disturbance, with the consequent breathing difficulty. It is operated on with the principle of removing no more than necessary and giving back what has been removed.
The five Cottle areas and what each implies
| Area | Where | What it demands |
|---|---|---|
| I — Vestibular | From the nostril to the caudal border of the upper lateral | Territory of the external valve and vestibular scars. Synechiae, nostril atresia |
| II — Valvular | The angle between the caudal border of the upper lateral and the septum | The point of greatest resistance in the whole airway. A high septal deviation here weighs far more than a large posterior one |
| III — Attic | Under the nasal bones, above the valve | Deviations of the osseocartilaginous junction. This is the zone corrected by combining septoplasty and osteotomies |
| IV — Inferior turbinate | Facing the head of the inferior turbinate | Here septal deviation and contralateral turbinate hypertrophy compete: almost always both must be treated |
| V — Middle turbinate and choana | The posterior portion of the fossa | Territory of spurs and bony crests. A good graft donor zone with little structural cost |
Examination: each cause has its manoeuvre
- Septal deviationRhinoscopy and endoscopy. Imaging — CT — is reserved for associated sinus disease, not to diagnose the deviation
- Turbinate hypertrophyVasoconstriction test: touch the turbinate with an adrenaline-soaked swab. If breathing improves, the component is mucosal and responds to medical treatment or reduction
- Ptotic tipLift the tip by pulling the dorsal skin upward. If ventilation improves, the problem is rotational and is solved with columellar support, not septoplasty
- Internal valveCottle manoeuvre: two fingers over the ascending process of the maxilla pulling laterally. If it improves, there is valvular incompetence and the manoeuvre is a spreader graft
- External valveDilate the nostril with forceps or a swab. If it improves, alar support is lost: alar rim or pre-rim grafts, or composite grafts if there is a skin deficit
Do not settle for “I breathe fine”
Many patients are unaware of their obstruction because they have never breathed any other way. That is why the direct question is useless as screening. What does orient is indirect questioning: waking with a dry throat, snoring, poor sleep, frequent headaches, repeated respiratory infections, mouth breathing and a nasal voice. A validated questionnaire such as the NOSE scale organises that information and allows before-and-after comparison with a number, which is what makes a functional result defensible.
The septal approach sequence
- Finding the planeSeparate the medial crura and cauterise at the columellar level until the caudal septal border is seen. Incise the perichondrium on each side with a 15 blade
- Elevating the perichondriumWith the Cottle elevator, over the whole extent. The more caudally you start, the easier: the septum is stiffer there and the plane is found more readily
- The tunnelsOne, two or three depending on the defect, seeking the best access without opening the mucosa. Release the septum from the maxillary crest and, with the speculum inside each pocket, elevate over the perpendicular plate and vomer
- Separating the upper lateralsDetach them from the cartilaginous septum while steadying it with bayonet forceps. One may choose not to divide them and keep them intact to use later as a spreader flap
- Before resectingTrim the cephalic edge — which profiles the dorsum — and assess the caudal one: the straighter the caudal edge is left, the more rotation is being given to the tip. That last manoeuvre is better left for later, once the tip is defined
The 1×1 rule, and why it is a floor and not a target
The rule is to leave at least 1 cm of dorsal and 1 cm of caudal septum to guarantee pyramidal stability. It is worth knowing where that number comes from: the cadaveric biomechanical study that tested it found that strut rigidity falls markedly below 9-10 mm, and that the dorsal limb carries more load than the caudal one. The practical reading is that 1 cm is the minimum one dares to leave, not the target: in practice it is reasonable to leave considerably more — of the order of 14 mm per limb — unless graft needs force otherwise. And there is a useful anatomical nuance: the quadrangular cartilage is not a uniform plate but varies in thickness, being thickest at its junction with the maxillary crest, which is precisely where the best spreaders come from.
Septal techniques, from most conservative to most aggressive
| Technique | What it involves | When |
|---|---|---|
| Cross-hatching and weakening | Crushing and superficial incisions on the concave surface to release the cartilage’s internal forces without resecting it | Gentle diffuse curvatures, when the aim is not to touch the support |
| Swinging door | Through a single tunnel the quadrangular cartilage is freed from the maxillary crest, a full-thickness anteroposterior incision is made in the concavity and the septum is repositioned in the midline | The localised caudal deviation, the one that deviates the tip |
| Full-thickness incisions in the concavity | Division on the concave side, the opposite of what instinct suggests: it is the fibres of that surface that hold the angulation | Sharp cartilage angulations, and also when thinning an angulated spreader |
| Submucous resection | Resection of the deviated cartilage and bone preserving the dorsal and caudal struts. Bony resection may be localised — spur, crest — or extensive | Bony deviations and graft harvest: the usual route to obtain septal cartilage |
| Extracorporeal correction | Complete removal of the cartilage, correction outside the nose and reimplantation of the neoseptum | The extreme case: a C- or S-shaped deviation that yields to nothing above |
Caudal deviation and the anterior nasal spine
When the caudal septum is deviated on the spine, freeing it is not enough: it must be fixed. It is detached from the maxilla, the lowest part of the remaining caudal limb is resected to allow mobilisation, and the spine is drilled with a fine bur to pass a 4/0 PDS suture that enters from the non-deviated side and is knotted there. Many surgeons perform this fixation always, whether or not there is obvious deviation, because it stabilises the base of the whole subsequent reconstruction. A useful trick afterwards: if on placing the caudal extension graft the construct deviates to one side, the corrective stitch is an asymmetric mattress passing on the way out through upper lateral, spreader and septum on the opposite side, and on the way back only through the caudal extension.
The internal valve: the resistance that decides
The angle between the caudal border of the upper lateral and the septum is the point of greatest resistance in the whole airway, which is why a narrowing of a few millimetres there weighs more than a much larger posterior deviation. It is compromised in two ways: by excessive resection — of upper laterals, septum or vestibular skin — and by dorsal reduction, which on opening the roof destabilises the upper lateral–septal junction. The practical consequence is that closing the open roof and treating the valve are the same manoeuvre, which is why spreaders are placed routinely after a significant dorsal reduction, not only when symptoms already exist. Their length should exceed the caudal border of the nasal bones after osteotomy, of the order of 22 mm or a few millimetres beyond the septal junction. Particular care is needed with short nasal bones, wide upper laterals, thin skin or an already narrow dorsum.
Three ways to open the valve
| Technique | How | When it suits |
|---|---|---|
| Spreader graft | Two strips of septal cartilage of about 25 × 2.5 mm and 1.5 mm thick, housed in submucous pockets parallel to the dorsal septal border | When there is cartilaginous dorsal deviation to correct, or the upper lateral will not suffice. The stiffer graft goes on the deviated side |
| Spreader flap / autospreader | The upper lateral is not divided: it is folded on itself with an incomplete greenstick incision towards the septum, and sutured in that position | When there is excess upper lateral after dorsal reduction. It saves septal cartilage for the other grafts, which is almost always the scarce resource |
| Resection of excess and direct suture | The excess cephalic portion of the upper lateral is divided according to how the dorsum sits, and sutured to septum and spreader | The default when spreaders are already in and the upper lateral is redundant: suture first, then trim what protrudes |
The spreader suture sequence
- A first unilateral spreader-to-septum stitch, one or two, which sets the graft’s height before committing to anything else.
- Then spreader-septum-contralateral spreader: the stitch that fixes the construct as a single rigid unit. Some pass both spreaders in one go.
- And finally upper lateral-spreader-septum-spreader-upper lateral, several, where definitive stability and reconstruction of the valve angle are sought.
- To narrow the bony dorsum, two small burr holes in the remaining nasal bones and a 4/0 PDS stitch approximate them in a controlled way.
- At the end, run a finger over the dorsum and remove osseocartilaginous interferences and spicules before considering the middle third closed.
The turbinates: the manoeuvre most often overdone
Reduction of the inferior turbinate contralateral to the deviation frequently accompanies septoplasty, and most place it after the septoplasty and before the osteotomies. It is worth being conservative for two reasons. The first is technical: direct scissor division bleeds considerably more than radiofrequency reduction or simple outfracture. The second is physiological: the turbinate warms and humidifies the air, and over-cauterising it is associated with dry rhinitis and the paradoxical sensation of a blocked nose with a wide fossa. If turbinoplasty is done and there is a synechia risk, a silicone sheet secured with silk for a week in each fossa prevents adhesion between septum and turbinate.
Complications and what to do about them
- Septal perforation: the major complication, and septal surgery is its leading cause. It is prevented by correct perichondrial elevation and by tunnels that do not cross the contralateral mucosa at the same point.
- Most perforations are asymptomatic and well tolerated, needing only saline irrigation and healing ointments. Small ones whistle; those causing crusting, epistaxis or columellar retraction are the ones operated on.
- Closure with local flaps is effective below 2 cm and very difficult above 4 cm, where an oral mucosal flap may be required.
- Faced with a perforation with irregular, thickened, necrotic edges, do not assume a surgical origin: biopsy it, since it may be infectious, inflammatory or neoplastic.
- Nostril atresia from cicatricial retraction appears when vestibular mucosa is resected imprudently or when incisions are joined circumferentially, particularly the lateral one with the osteotome entry. Correcting it requires z-plasties, flaps or chondrocutaneous grafts.
Still breathing poorly after surgery
Does it improve on pulling the skin over the ascending maxillary process laterally?
Does it improve on dilating the nostril with forceps or a swab?
Does rhinoscopy show residual deviation, synechia or perforation?
References
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Related specialty: Rhinoplasty