Spreader Grafts vs Spreader Flaps: How Surgeons Protect Your Breathing After a Hump Reduction

Most people who ask for a hump reduction are thinking about profile. Surgeons are thinking about the roof. When a dorsal hump is lowered, the surgeon removes the top of a structure called the middle vault, the region where the upper lateral cartilages meet the septum. Taking down that roof creates an open segment that must be rebuilt, and how it gets rebuilt has real consequences for breathing, contour, and long-term stability.

Why the middle vault matters. The junction between the upper lateral cartilages and the septum forms the internal nasal valve, the narrowest point of the entire airway. Its angle is normally somewhere around 10 to 15 degrees. Even a small reduction in that angle produces a large drop in airflow, because resistance in a narrow tube rises steeply as the radius shrinks. This is the mechanical reason a nose can look fine after surgery and still feel blocked. When a hump is removed and the roof is left open, the upper lateral cartilages tend to collapse inward and downward over months to years. The visible result is an inverted V deformity, a shadowed line where the nasal bones end. The functional result is valve narrowing.

What a spreader graft is. A spreader graft is a thin strip of cartilage, usually harvested from the patient's own septum, placed vertically between the septum and the upper lateral cartilage on one or both sides. Mechanically it acts as a shim. It holds the upper lateral cartilage away from the septum, preserving or widening the valve angle, and it restores dorsal width so the bridge lines look smooth from bones to tip. Spreader grafts became a standard tool after long-term studies of reduction rhinoplasty showed high rates of middle vault collapse when the open roof was simply closed by pushing the walls together.

What a spreader flap is. A spreader flap, sometimes called an autospreader, uses tissue that would otherwise be discarded. Instead of trimming away the excess upper lateral cartilage after the hump comes down, the surgeon folds that excess inward on itself and sutures the folded edge to the septum. The fold occupies the same position a graft would. The appeal is efficiency: no separate graft harvest, less septal cartilage used, and the tissue is already attached with its own blood supply and natural position.

How they compare in practice. Comparative studies and systematic reviews generally find that both techniques improve or preserve airway function after hump reduction, with broadly similar patient-reported breathing scores at one year. The differences show up at the margins. Spreader grafts offer more control. The surgeon chooses the thickness, length, and stiffness of the strip, which matters in noses with a deviated dorsal septum, weak or short upper lateral cartilages, or a large hump where little cartilage remains to fold. Grafts are also the workhorse in revision surgery, where prior resection often leaves nothing to flap. Spreader flaps depend on having enough healthy cartilage left after the reduction. For small to moderate humps in a straight nose, many surgeons consider flaps adequate and prefer preserving septal cartilage for other uses. For large reductions, crooked noses, or thin flimsy cartilage, grafts or a combination tend to win.

Cosmetic tradeoffs exist in both directions. A spreader graft that is too thick can leave the middle third looking wide, particularly in thin-skinned patients where edges may become visible over years. A spreader flap that is folded from soft cartilage can lose its shape as scar contracture pulls inward, allowing late narrowing. Neither technique is a set-and-forget solution; both rely on suture fixation and on the surgeon judging cartilage quality in real time.

A note on preservation rhinoplasty. Some surgeons now avoid opening the roof at all by lowering the entire dorsum as a unit, techniques grouped under dorsal preservation. When the roof is never opened, spreader reconstruction may be unnecessary. But preservation methods have their own selection criteria and learning curve, and many noses, especially crooked ones or those with prior surgery, are still better served by structural approaches where spreaders remain central.

What patients should actually ask. Rather than requesting a specific technique, it is more productive to ask a surgeon three things. First, how will the middle vault be reconstructed after the hump comes down. Second, how is the internal valve being assessed before surgery, since preexisting valve narrowing changes the plan. Third, if septal cartilage is limited, what is the backup source. A surgeon who has a clear answer to all three is thinking about the roof, not just the profile.

The takeaway is straightforward. Hump reduction is subtraction, and subtraction at the middle vault demands reconstruction. Spreader grafts and spreader flaps are two mechanically sound ways to do that job. The best choice depends on how much cartilage the nose offers, how straight the septum is, and how much correction the airway needs, which is exactly why this decision is usually finalized on the operating table rather than in the consultation room.

Related reading: Spreader Grafts vs Autospreader Flaps: What Actually Holds Your Middle Vault Open.