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Nasal septal caudal dislocation — Clinical Guidelines

Overview

Nasal septal caudal dislocation refers to a displacement of the lower portion of the nasal septum, often leading to significant nasal obstruction and aesthetic deformities such as alar retraction and nasal tip asymmetry. This condition is particularly challenging due to the thinness of the septal cartilage in certain populations, like Asians, and the risk of postoperative deformities such as external nose irregularities. Clinicians frequently encounter this issue in patients seeking relief from chronic nasal blockage and improved facial aesthetics. Accurate diagnosis and effective surgical correction are crucial for achieving both functional and cosmetic outcomes, making this topic essential for otolaryngologists and plastic surgeons in day-to-day practice. 1 2 3 8

Pathophysiology

The pathophysiology of nasal septal caudal dislocation involves structural abnormalities in the cartilaginous framework of the nasal septum, particularly affecting the L-strut and the external nasal valve area. Trauma, congenital anomalies, or previous surgical interventions can lead to weakening or misalignment of the caudal septum. The intrinsic memory and flexibility of the septal cartilage often complicate straightforward realignment, necessitating advanced surgical techniques to stabilize the displaced segment effectively. Inadequate stabilization can result in recurrent dislocation and persistent functional deficits, underscoring the importance of meticulous surgical planning and execution. 1 3 18

Epidemiology

The exact incidence and prevalence of nasal septal caudal dislocation are not well-documented in large population studies, but it is commonly encountered in clinical settings, particularly among patients with chronic nasal obstruction. The condition appears to affect individuals across all age groups but may be more prevalent in adults seeking aesthetic rhinoplasty or those with a history of nasal trauma. Geographic and ethnic variations exist, with thinner septal cartilage in certain populations (e.g., Asians) potentially predisposing them to more challenging surgical corrections. Trends suggest an increasing awareness and demand for corrective procedures due to improved surgical techniques and patient expectations for both function and aesthetics. 1 8 19

Clinical Presentation

Patients with nasal septal caudal dislocation typically present with complaints of unilateral or bilateral nasal obstruction, often exacerbated during specific activities like breathing during sleep or physical exertion. Aesthetic concerns may include a crooked nose, nasal tip asymmetry, and alar retraction, which can significantly impact self-esteem. Red-flag features include recurrent epistaxis, facial pain, or evidence of chronic sinusitis, which may indicate additional underlying pathology requiring further evaluation. Accurate clinical assessment through nasal endoscopy and physical examination is crucial for identifying the extent of deviation and planning appropriate intervention. 1 2 3 16

Diagnosis

The diagnostic approach for nasal septal caudal dislocation involves a thorough clinical evaluation complemented by imaging studies when necessary. Key steps include:

Physical Examination: Detailed inspection and palpation of the nasal septum to identify the degree and direction of deviation.

Nasal Endoscopy: Provides a clear view of the internal structures, aiding in precise localization of the dislocation.

CT Scan or MRI: Useful in complex cases to assess bone involvement and overall nasal anatomy, though not routinely required.

Specific Criteria and Tests:

Degree of Deviation: Measured in millimeters; significant deviation typically >5mm.

Symptom Correlation: Nasal obstruction severity correlated with patient-reported quality of life scores.

Imaging Findings: CT scans showing >3mm displacement of the caudal septum from the midline.

Differential Diagnosis: Exclude other causes of nasal obstruction such as turbinate hypertrophy, septal perforation, or sinusitis through appropriate ancillary tests (e.g., nasal airflow studies, allergy testing).

Differential Diagnosis:

Deviated Nasal Septum without Dislocation: Less severe displacement without significant external deformity.

External Nasal Fractures: History of trauma and visible external deformities help distinguish.

Hypertrophic Rhinitis: Inflammatory changes rather than structural dislocation; nasal endoscopy and biopsy if necessary.

Management

Initial Management

Conservative Measures: Nasal saline sprays, decongestants, and antihistamines for symptomatic relief.

Patient Education: Understanding the condition and realistic expectations from surgery.

Surgical Intervention

#### First-Line Techniques

Cutting and Suture Technique (C&S):

- Procedure: Incise and overlap the deviated cartilage segments, securing with sutures. - Support Grafts: Use of batten grafts from septal or auricular cartilage to provide additional support. - Contraindications: Severe thinness of septal cartilage without adequate structural integrity.

#### Second-Line Techniques

Modified Cutting and Suture Technique (MCAST):

- Procedure: Altered cutting site and fixation method to avoid batten grafts, focusing on precise suturing. - Outcome Goals: Correct nasal obstruction while preserving nasal tip projection. - Monitoring: Postoperative nasal endoscopy and patient-reported outcomes at 1 week, 1 month, and 3 months.

Two-Level Septocolumellar Suture Technique:

- Procedure: Utilizes interlocking sutures to stabilize the caudal septum effectively. - Support: Additional grafts may be used if necessary to prevent tip projection loss. - Follow-Up: Regular assessments to ensure graft integration and functional stability.

#### Refractory Cases

Advanced Surgical Approaches:

- Caudal Septal Division and Interposition Batten Graft: - Procedure: Divide the caudal septum and insert interposition grafts to realign and stabilize. - Specialist Referral: Consider referral to experienced rhinoplasty surgeons for complex cases. - 3D-Printed Polycaprolactone Mesh: - Procedure: Use of biocompatible mesh for additional structural support post-wedge resection. - Monitoring: Long-term follow-up to assess graft integration and patient satisfaction.

Complications

Acute Complications: Postoperative bleeding, infection, and graft displacement.

- Management Triggers: Immediate signs of infection (fever, purulent discharge) or significant bleeding requiring intervention.

Long-Term Complications: Recurrent dislocation, nasal tip asymmetry, and external nose deformities.

- Management Triggers: Persistent symptoms or visible deformities necessitating revision surgery. - Referral: Complex complications often require referral to specialized rhinoplasty surgeons.

Prognosis & Follow-up

The prognosis for correcting nasal septal caudal dislocation is generally favorable with appropriate surgical intervention, achieving both functional relief and aesthetic improvement in the majority of cases. Key prognostic indicators include the severity of initial deviation, surgical technique employed, and adherence to postoperative care protocols. Recommended follow-up intervals include:

Initial: Postoperative week 1 for wound inspection.

Short-Term: 1 month for reassessment of nasal function and appearance.

Long-Term: 3-6 months and annually to monitor for any recurrence or complications.

Special Populations

Pediatric Patients: Nasal septal deviations in children often require conservative management initially, with surgical intervention considered if conservative measures fail.

Elderly Patients: Increased risk of comorbidities and healing complications; careful preoperative assessment and tailored surgical techniques are essential.

Asian Populations: Thin septal cartilage necessitates careful selection of grafting materials and techniques to avoid external deformities.

Comorbid Conditions: Patients with chronic sinusitis or nasal trauma history may require additional management strategies to address underlying issues concurrently.

Key Recommendations

Surgical Correction with Advanced Techniques: Employ modified cutting and suture techniques or two-level septocolumellar suture methods to achieve stable correction and preserve nasal tip projection. (Evidence: Strong)

Use of Support Grafts: Incorporate batten grafts or innovative materials like 3D-printed polycaprolactone mesh when necessary to ensure structural integrity. (Evidence: Moderate)

Preoperative Assessment: Conduct thorough nasal endoscopy and imaging to accurately assess the extent of caudal septal dislocation. (Evidence: Moderate)

Postoperative Monitoring: Regular follow-up with nasal endoscopy and patient-reported outcomes to ensure proper healing and function. (Evidence: Moderate)

Specialist Referral for Complex Cases: Consider referral to experienced rhinoplasty surgeons for cases with severe deviation or previous failed surgeries. (Evidence: Expert opinion)

Patient Education: Provide detailed preoperative counseling on realistic outcomes and postoperative care to manage patient expectations. (Evidence: Expert opinion)

Avoid Over-Resection: Minimize cartilage resection to prevent complications such as tip projection loss and alar retraction. (Evidence: Moderate)

Consider Ethnic Variations: Tailor surgical approaches based on the patient’s ethnic background, particularly considering thinner septal cartilage in Asian populations. (Evidence: Moderate)

Monitor for Complications: Vigilantly monitor for signs of infection, bleeding, and graft displacement in the immediate postoperative period. (Evidence: Strong)

Long-Term Follow-Up: Schedule periodic assessments to detect and address any late complications or recurrence of deviation. (Evidence: Moderate)

References

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Nasal septal caudal dislocation