# Rhinoplasty: Functional and Aesthetic Principles

## Introduction

Rhinoplasty is one of the most technically demanding procedures in facial plastic surgery, requiring a thorough understanding of both **nasal aesthetics** and **functional anatomy**. The modern rhinoplasty surgeon must address airway obstruction while achieving a natural, balanced appearance that harmonizes with the patient's overall facial proportions. The combination of functional and aesthetic goals is termed **functional rhinoplasty**.

## Nasal Anatomy

### External Framework

**Bony vault**: Paired nasal bones and ascending processes of the maxilla. **Upper lateral cartilages (ULCs)**: Fused to the dorsal septum in the middle vault. **Lower lateral cartilages (LLCs)**: Composed of medial, intermediate, and lateral crura. **Scroll area**: Cephalic margin of the LLC overlapping the caudal margin of the ULC. **Keystone area**: Critical junction of the nasal bones, ULCs, and perpendicular plate of the ethmoid.

### Internal Nasal Valve

Defined by the angle between the **caudal edge of the ULC** and the **nasal septum**. Normal angle is **10-15 degrees**. The most common site of nasal airway obstruction. **Cottle maneuver**: Lateral displacement of the cheek to open the valve; positive result indicates valve collapse.

### Blood Supply and Innervation

Arterial supply from branches of the **ophthalmic** and **facial arteries**. External nasal nerve (branch of V1) provides sensation to the nasal tip. Marginal incisions should preserve the columellar branch of the superior labial artery.

## Preoperative Evaluation

### Patient Assessment

Thorough nasal history: obstruction, trauma, prior surgery, medications. **Standardized photography**: Frontal, lateral, oblique, and basal views. Anterior rhinoscopy and nasal endoscopy to assess septum, turbinates, and valves. Assess **skin thickness** (thin skin shows every irregularity; thick skin limits tip definition). Evaluate patient expectations and psychological readiness; screen for **body dysmorphic disorder**.

### Nasal Analysis

**Nasofrontal angle**: 115-130 degrees. **Nasolabial angle**: 90-95 degrees (males), 95-110 degrees (females). **Tip projection**: Goode ratio (tip projection / nasal length = 0.55-0.60). **Tip rotation**: Defined by the nasolabial angle. Dorsal aesthetic lines should form smooth, gently diverging curves from brow to tip.

![Nasal analysis landmarks demonstrating ideal proportions and angles](images/nasal-analysis-landmarks.jpg)

## Surgical Approaches

### Open vs. Closed Rhinoplasty

**Open approach**: Transcolumellar incision with marginal incisions; provides direct visualization. Preferred for complex tip work, revision cases, and teaching. Disadvantage: Columellar scar (usually heals well), longer operative time, more edema. **Closed (endonasal) approach**: All incisions inside the nose. Intercartilaginous, transfixion, or delivery approaches. Advantages: No external scar, less edema, shorter recovery. Limited visualization of the tip and dorsum.

### Key Surgical Maneuvers

**Dorsal hump reduction**: Sequential reduction of cartilaginous and bony dorsum; avoid over-resection. **Osteotomies**: Lateral and medial osteotomies to narrow the bony vault after hump removal. **Spreader grafts**: Placed between the ULC and septum to maintain or widen the internal nasal valve. **Tip suturing techniques**: Interdomal, transdomal, and columellar-septal sutures for tip refinement. **Cephalic trim**: Conservative resection of the cephalic margin of the LLC (preserve at least 6-8 mm). **Alar batten grafts**: Placed laterally to prevent external valve collapse.

![Intraoperative open rhinoplasty demonstrating lower lateral cartilage exposure](images/open-rhinoplasty-intraop.jpg)

## Functional Considerations

### Septoplasty

Performed concurrently to correct septal deviation contributing to obstruction. Preserve an **L-strut** of at least 10-15 mm dorsally and caudally for structural support. Harvested septal cartilage serves as autologous graft material.

### Turbinate Reduction

Inferior turbinate hypertrophy is a common contributor to nasal obstruction. Submucosal resection, radiofrequency ablation, or outfracture techniques. Avoid aggressive mucosal resection to prevent **empty nose syndrome**.

### Nasal Valve Repair

Spreader grafts for internal valve stenosis. Alar batten grafts or lateral crural strut grafts for external valve collapse. **Butterfly graft**: Conchal cartilage graft spanning the dorsum to open the internal valve.

## Grafting Materials

| Graft Source | Primary Use | Advantages | Disadvantages |
|-------------|-------------|------------|---------------|
| Septal cartilage | First choice for most grafts | Readily available, easy to carve, no donor morbidity | Limited quantity |
| Auricular (conchal) cartilage | When septal cartilage insufficient | Good for batten/shield grafts | Curved, limited rigidity |
| Costal cartilage | Major reconstruction, revision | Abundant quantity, strong | Warping risk, donor site pain |
| Irradiated homologous rib | Alternative to autologous rib | Avoids harvest morbidity | Higher resorption rate |
| Diced cartilage fascia (DCF) | Dorsal augmentation | Smooth contour, natural feel | Less structural support |

**Septal cartilage**: First choice; readily available and easy to carve. **Auricular (conchal) cartilage**: When septal cartilage is insufficient. **Costal cartilage**: For major reconstruction; risk of warping. **Irradiated homologous rib cartilage**: Alternative to autologous rib; higher resorption rate. **Diced cartilage fascia graft (DCF)**: Useful for dorsal augmentation.

![Spreader grafts placed between the upper lateral cartilages and septum](images/spreader-grafts-placement.jpg)

## Complications

**Over-resection of the dorsum**: Saddle nose deformity or inverted-V deformity. **Pollybeak deformity**: Fullness of the supratip area from excess cartilage or scar tissue. **Nasal valve collapse**: From inadequate structural support. **Asymmetry**: Most common reason for revision rhinoplasty. **Rocker deformity**: Medial displacement of the nasal bone from incomplete osteotomy.

## Key Clinical Pearls

The internal nasal valve is the most common site of nasal airway obstruction and must be assessed in every rhinoplasty patient. Preserve at least 6-8 mm of the lateral crus during cephalic trim to prevent alar collapse. Spreader grafts should be placed routinely after dorsal hump reduction to prevent inverted-V deformity. Always undercorrect rather than overcorrect; revision for residual fullness is simpler than reconstruction of over-resected structures. Thick-skinned patients require strong structural grafting for tip definition; thin-skinned patients require meticulous graft contouring.

## References

1. Rohrich RJ, Ahmad J. Rhinoplasty. *Plast Reconstr Surg*. 2011;128(2):49e-73e.
2. Toriumi DM. New concepts in nasal tip contouring. *Arch Facial Plast Surg*. 2006;8(3):156-185.
3. Constantian MB. The incompetent external nasal valve: pathophysiology and treatment in primary and secondary rhinoplasty. *Plast Reconstr Surg*. 1994;93(5):919-931.
4. Papel ID, et al. *Facial Plastic and Reconstructive Surgery*. 4th ed. Thieme; 2016.