Nasal Osteotomy: Bone Repositioning in Rhinoplasty

A nasal osteotomy is a controlled fracture of the nasal bones performed to reposition, narrow, or straighten the nasal dorsum and bridge. Unlike tip work, which revolves primarily around cartilage reshaping, nasal osteotomy targets the rigid bony framework that comprises roughly the upper third to half of the external nose. The procedure demands precision and knowledge of bone healing, blood supply, and three-dimensional positioning to avoid over-correction, under-correction, or asymmetry.

The anatomical rationale is direct. The nasal bones sit atop the perpendicular plate of the ethmoid and extend from the nasal root downward to the cartilaginous portion of the dorsum. When a patient presents with a dorsal hump, a wide nasal bridge, or deviation from midline, the bones are often the primary culprit. Reshaping cartilage alone will not address bony disproportion; osteotomy becomes necessary.

Three primary osteotomy patterns exist in contemporary rhinoplasty: the lateral osteotomy, the medial osteotomy, and the transverse (or basal) osteotomy. Lateral osteotomies run vertically along the sides of the nasal bones and are used when the goal is to narrow a wide bridge or to mobilize the bones medially for straightening or repositioning. Medial osteotomies cut through the nasal bones near the midline and allow downfracture when dorsal hump reduction requires it. Transverse osteotomies cut across the nasal bones horizontally and are less commonly used but can be helpful in specific cases of severe deviation or asymmetry.

The technique of osteotomy placement has evolved with technological advances. Traditional methods rely on a small chisel (usually 2 to 3 millimeters wide) driven by hand mallet, allowing the surgeon to feel and control fracture propagation. Ultrasonic rhinoplasty piezo instruments have introduced an alternative approach, using high-frequency vibration to cut bone with reduced soft tissue trauma and improved precision. Some surgeons report that piezo osteotomy permits more controlled fracture lines and faster healing, though data comparing outcomes remain limited.

When performing a lateral osteotomy, the surgeon typically places the chisel just lateral to the pyriform aperture, angling it to run upward and slightly medial along the nasal bone. The goal is to create a fracture line that will allow the nasal bone to move inward without fragmenting into multiple pieces or creating an irregular step. The osteotomy is carried upward until it reaches approximately the level of the medial canthus, avoiding the lacrimal fossa and any major vascular structures.

Medial osteotomy serves a different purpose and follows a different path. Placed close to the midline, the medial osteotomy allows the surgeon to lower the nasal roof and reduce a dorsal hump that sits high on the bony dorsum. In many dorsal hump removal rhinoplasty procedures, both lateral and medial osteotomies work together: the medial osteotomy removes height, and the lateral osteotomies allow the nasal bones to shift inward and downward to close any resulting open roof deformity.

Open roof deformity is a critical concept in osteotomy management. When the nasal bones are reduced in height but not repositioned, a valley or indentation appears on the dorsum, creating a visible and palpable depression. Lateral osteotomies prevent this by allowing the bones to collapse inward, maintaining dorsal continuity and width. Surgeons must calculate the degree of medial and lateral osteotomy carefully; too much medial work without adequate lateral repositioning leads to open roof, while excessive lateral repositioning can create an overly narrow bridge or visible step.

Hemostasis during osteotomy is important but generally manageable. The nasal bones have robust blood supply from branches of the angular and dorsal nasal arteries, but these vessels run on the external surface of the bone and are usually not directly violated by the osteotomy itself. Bleeding from the marrow space is controlled with gentle pressure, epinephrine-soaked cottonoid pledgets, or cautery if necessary.

Healing after osteotomy typically progresses rapidly. The nasal bones are among the most robustly healing structures in the body, and fracture consolidation usually occurs within 2 to 4 weeks. However, full bony remodeling continues for several months, and some surgeons recommend avoiding significant external pressure or trauma for at least 3 to 6 weeks post-operatively. Splinting and taping of the external nose are routine after osteotomy, both to protect the bones and to guide their reposition during early healing.

Complications from osteotomy are infrequent. Asymmetry can occur if the fracture is not controlled or if repositioning is uneven, and this may require revision. Inadequate narrowing or under-correction of deviation is more common than over-correction and typically results from surgeon hesitation or insufficient lateral osteotomy extent. Excessive narrowing is rare but can result in a pinched appearance or saddling if too much width is lost.

The relationship between osteotomy and overall rhinoplasty outcomes cannot be overstated. A well-executed osteotomy creates a stable skeletal foundation for tip work and grafting. Conversely, poor osteotomy technique can compromise even excellent tip sculpture, as the bones beneath will not provide adequate support or symmetry.

Nasal osteotomy remains a core skill in rhinoplasty training and practice. Understanding the anatomy, the biomechanics of fracture and healing, and the three-dimensional consequences of bone repositioning is essential for any surgeon seeking to master this field.