Nasal Septal Fracture

Etiology

Nasal bones can be fractured by various traumas to the maxillofacial skeleton. The most common causes of nasal bone fractures globally are interpersonal violence, motor vehicle accidents, sporting accidents, and falls. In North America, traffic accidents account for more nasal bone fractures than interpersonal violence.[4] In children, the most common cause is sporting or motor vehicle accidents, depending on the source.[4][5] Interestingly, ball-related sports such as soccer, basketball, baseball, and rugby have a higher incidence of nasal bone fractures than fighting sports.[4]

Epidemiology

Nasal bone and septal fractures are much more common in men and boys compared to women and girls. This has been attributed to the higher incidence of interpersonal violence between males.[6] The incidence of nasal bone fractures peaks in the second and third decades of life.[6][7] In the United States, rates of nasal bone and other facial fractures have steadily increased since 2000. Still, repair rates have remained stable, potentially suggesting an increase in nonoperative fracture pattern frequency, a trend towards more conservative management, and increased use of computed tomography (CT) imaging to help guide management.[7]

Pathophysiology

Generally, a frontal or lateral to the nose is more likely to cause a fracture of the nasal bones and nasal septum.[8] Fractures can be unilateral or bilateral, nondisplaced or severely depressed, greenstick, or comminuted.[9] Fractures may involve the nasal bones, nasal cartilage, septal cartilage, and even the surrounding facial skeleton in more severe injuries with higher energy impacts.

History and Physical

Patients who have undergone trauma to the maxillofacial region should first have a primary trauma survey performed, addressing airway, breathing, circulation, and disability. After life-threatening issues have been addressed, a thorough history and secondary physical examination may be performed.

It is essential first to determine the mechanism of trauma to the maxillofacial region. Higher energy impact traumas, as seen in motor vehicle accidents, are liable to produce more severe injuries and may be associated with multiple facial fractures. The direction of impact may be important to better understand the underlying fracture pattern. Lateral blows tend to cause an infracture on the impacted side and outfracture on the opposite side, while impact directed straight onto the nasal dorsum tends to cause splaying outfractures of the bilateral nasal bones.[10] It is also essential to get a sense of premorbid appearance. Patients should be asked if they notice obvious deviation or deformity compared to before the injury. Difficulty breathing through either side of the nose should be assessed, as this can signify injury to the nasal septum or intranasal edema.[11] The patient should also be questioned regarding any prior nasal trauma or surgeries. Symptoms that may indicate more extensive injuries include telecanthus, diplopia, vision loss, clear rhinorrhea, malocclusion, facial weakness, and facial numbness.

Physical examination should include a thorough assessment of the entire head and neck region, including skin, eye, ear, intraoral, and intranasal examinations. A complete evaluation of the nasal dorsum and nasal cavity should be performed with a headlamp and a nasal speculum or rigid endoscope. The external nose should be closely evaluated for lacerations and exposed bone or cartilage. Any deviation of the bony nasal pyramid should be documented. A post-traumatically increased intercanthal distance suggests the presence of a nasoorbitoethmoid (NOE) fracture.[10] The nasal tip should be palpated to assess for adequate support, and the nasal dorsum should undergo evaluation for a saddle nose deformity, which may indicate significant septal fracture or dislocation.[11] An intranasal examination should first rule out a septal hematoma, which appears as a fluctuant red or blue discoloration along the nasal septum.[12] This submucoperichondrial blood collection requires prompt incision and drainage to prevent abscess development or septal cartilage necrosis, which may occur within as little as 24 hours. Over time, the resulting cartilage necrosis may lead to septal perforation and saddle nose deformity.[12] Significant dislocations of the septum should be noted, and any intranasal lacerations or mucosal disruptions should also be documented. Care should be taken to inspect for clear rhinorrhea, suggesting a cerebrospinal fluid (CSF) leak.[11]

Evaluation

Imaging is generally not warranted for simple nasal bone fractures. Plain film X-rays are not typically useful. A CT scan without intravenous contrast of the facial bones is the gold standard for evaluating bony trauma of the maxillofacial area if there is a concern for more extensive facial injuries.[11] Concerning symptoms, as previously noted, should prompt imaging studies. More recently, ultrasonography's role in diagnosing nasal bone fractures has been studied but has thus far proved inferior to CT scanning.[13]

Laboratory evaluation is generally not required in the case of a simple nasal bone fracture or septal hematoma. Complete blood count and coagulation studies may be a consideration in patients with epistaxis who have lost a considerable amount of blood or take anticoagulant medication. Patients with persistent clear rhinorrhea can have the fluid collected and sent for beta-2-transferrin, which can help confirm or rule out the presence of a CSF leak.

Treatment / Management

Initial management should include control of epistaxis and closure of any external skin or internal nasal lining lacerations whenever possible. Epistaxis may be conservatively controlled with digital pressure, pushing the nasal alae against the septum. More serious epistaxis may require cauterization or nasal packing.[14]

Observation without surgical intervention is recommended in patients with no obvious cosmetic deformity or nasal obstruction. Conservative measures such as elevating the head and icing the area are recommended until local edema subsides. Patients should be closely followed within 3 to 5 days for reexamination, as nasal deviation can be unmasked with the resolution of edema.[15] 

Closed reduction of nasal bone and septal fractures is generally recommended for fractures that cause nasal deviation or airway obstruction. The procedure may be performed under local anesthesia or with minimal sedation, but general anesthesia is often preferable due to improved airway protection and overall patient comfort.[10] The reported timing of closed reduction varies in the literature, with some sources advocating early intervention within 5 to 7 days, while others state that edema should completely resolve and closed reduction should be performed within 1 to 2 weeks of injury.[10][11] After 2 weeks, patient satisfaction with cosmetic outcomes significantly decreases.[16] Later intervention risks callus formation and difficulty reducing nasal bones into their premorbid location because the fractured segments have already begun to heal in place. In these cases, an endonasal or percutaneous reduction can be performed using osteotomies.[11] In a typical closed reduction, a flat, broad instrument such as a Boies or Sayre elevator is introduced endonasally to reduce the fractured bony segments, and a postoperative splint is applied to the nasal dorsum.

Closed reduction may also be performed on the nasal septum using a Boies elevator or Asch forceps. Suppose adequate reduction of the nasal septum cannot be performed in a closed fashion. In that case, some authors advocate for open septoplasty in the acute setting, reporting that patients significantly improve nasal obstruction postoperatively.[17] Intranasal splints or packing may also help keep the septum aligned after reduction, but these are typically not placed unless a septoplasty has been performed. Septoplasty is avoided if there is significant mucosal disruption along the septum because of the risk of postoperative septal perforation.[17](B2)

Open septorhinoplasty is generally avoided in the acute setting, as nasal lacerations or cartilage disruptions frequently accompany nasal trauma. Further dissecting these cartilages can devascularize them in the acute setting, and any cartilage grafts placed during rhinoplasty may be more susceptible to infection and extrusion or absorption. It is, therefore, often recommended that septorhinoplasty be delayed 3 to 6 months post-injury.[18] The use of CT guidance to place osteotomies in the healed fracture lines to facilitate reduction months to years post-injury has also been described as a useful adjunct.[19](B3)

Differential Diagnosis

The differential diagnosis for nasal bone fractures should include bony injuries to the surrounding facial skeleton. These include the following:

NOE Complex Fracture

These nasal bone fractures extend posteriorly into the ethmoid air cells and involve the medial canthus of either or both eyes. The hallmark of this condition is traumatic telecanthus. NOE fractures also occur in all LeFort type III midface fractures.

Orbital Fracture

Periorbital edema or ecchymosis suggests an orbital fracture. An orbital floor fracture may cause hypoesthesia of the cheek or a limitation in ocular movements.

Skull Base Fracture

High-velocity impacts can cause skull base fractures. Patients may demonstrate characteristic bilateral periorbital ecchymosis, or "raccoon eyes," as well as postauricular ecchymosis, also known as "Battle's sign." Patients with skull base fractures are at higher risk for CSF leak and spinal fracture.

Prognosis

Patients typically recover well after reducing nasal bone fractures, but there is great variation in the success of surgical interventions. Nasal deformity remains present in 9% to 50% of patients after closed reduction.[15][18][20][21] Outcomes may be improved by promptly addressing nasal septal fractures or deviations at the time of injury.[2] Residual deformity or nasal obstruction may be addressed in a delayed fashion with septorhinoplasty. Patients would be at higher risk of needing revision surgery if nasal deformity or nasal obstruction were present before the nasal bone or septal fracture.[22]

Complications

The residual nasal deformity is frequently present to varying degrees following the reduction of the nasal bone and septal fractures. Saddle nose deformity and septal perforations may occur after septoplasty, septal hematoma formation, or severe septal injury. Olfactory disturbances are relatively common, occurring in up to one-third of patients with nasal bone fractures. This may be due to manipulating the olfactory neuroepithelium during closed reduction, located on the superior or supreme turbinate.[23]