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Fracture of orbital plate of ethmoid bone — Clinical Guidelines

Overview

Fracture of the orbital plate of the ethmoid bone, often referred to as orbital roof fractures, involves disruption of the thin bony structure that separates the orbit from the intracranial space. These fractures are clinically significant due to their potential to cause orbital complications such as enophthalmos (eye sinking into the orbit), diplopia (double vision), and cerebrospinal fluid (CSF) leaks, which can lead to meningitis if not promptly addressed. They predominantly affect individuals involved in high-impact trauma, such as motor vehicle accidents or falls, and are particularly notable in pediatric patients due to the softer nature of their bones, leading to more subtle presentations. Understanding and managing these fractures is crucial in day-to-day practice to prevent long-term functional and aesthetic deficits 1 2.

Pathophysiology

The pathophysiology of orbital plate fractures of the ethmoid bone typically arises from significant blunt force trauma directed towards the orbital region. The thin and delicate nature of the orbital roof makes it susceptible to buckling or direct fracture under such forces. This disruption can lead to herniation of orbital contents into the ethmoid sinus or even into the cranial cavity, depending on the extent of the fracture. In pediatric patients, the flexibility of the skull and orbit can result in subtle fractures that may not be immediately apparent on routine imaging, complicating early diagnosis 1. Additionally, the proximity of the ethmoid bone to critical structures like the optic nerve and cranial nerves necessitates careful assessment to prevent secondary neurological deficits 2.

Epidemiology

The incidence of orbital plate fractures, including those involving the ethmoid bone, is not extensively documented with precise figures across all populations. However, these injuries are more commonly observed in younger individuals and those involved in high-impact activities or accidents. Studies suggest a higher prevalence in males due to greater involvement in riskier behaviors and occupational hazards. Geographic variations may exist, influenced by environmental factors and safety regulations. Trends indicate an increasing awareness and diagnostic capability leading to more reported cases, though true incidence rates remain challenging to quantify precisely 1 3.

Clinical Presentation

Patients with fractures of the orbital plate of the ethmoidal bone often present with a constellation of symptoms that can vary from subtle to severe. Typical presentations include periorbital ecchymosis (raccoon eyes), swelling around the eyes, pain, and limitation of ocular movements indicative of extraocular muscle entrapment. Atypical presentations might involve less obvious signs, particularly in pediatric patients, where symptoms may be masked by the resilience of their tissues. Red-flag features include sudden onset of diplopia, proptosis (eye bulging), and signs of CSF rhinorrhea or otorrhea, which suggest potential cranial nerve involvement or intracranial communication 1 2.

Diagnosis

The diagnostic approach for orbital plate fractures of the ethmoid bone involves a combination of clinical evaluation and imaging techniques. Initial assessment includes a thorough history and physical examination focusing on ocular motility, visual acuity, and signs of CSF leakage. Radiological imaging, particularly high-resolution CT scans with thin cuts through the orbits, is crucial for identifying subtle fractures and assessing the extent of injury. Specific criteria for diagnosis include:

CT Scan Findings: Identification of bony disruption or depression in the orbital roof, often with associated soft tissue swelling 1.

Ocular Examination: Presence of restrictive movements in extraocular muscles, assessed using Hertel exophthalmometry for proptosis 2.

CSF Analysis: If CSF rhinorrhea is suspected, analysis of fluid obtained via nasal swab or lumbar puncture can confirm its presence 2.

Differential Diagnosis:

Orbital Blowout Fracture: Distinguished by involvement of the orbital floor rather than the roof, often with more pronounced enophthalmos 2.

Cavernous Sinus Thrombosis: Presents with more systemic symptoms like fever, proptosis, and ophthalmoplegia, requiring urgent neuroimaging and blood tests 2.

Management

Initial Management

Stabilization: Ensure airway patency and stabilize the patient, particularly if there are signs of intracranial injury or CSF leakage.

Imaging Confirmation: Obtain a high-resolution CT scan to confirm the diagnosis and assess the extent of the fracture 1.

Surgical Intervention

Indications: Consider surgical intervention for significant enophthalmos, diplopia, or herniation of orbital contents into the ethmoid sinus.

Techniques:

- Orbital Reconstruction: Use of autogenous materials such as septal cartilage or bone grafts harvested from the perpendicular plate of the ethmoid bone to reinforce the orbital roof 1. - Pedicled Flaps: Incorporation of vascularized nasoseptal flaps for structural support, especially beneficial in cases requiring postoperative radiotherapy 2.

Non-Surgical Management

Conservative Treatment: For minor fractures without significant complications, conservative management with close follow-up may suffice.

Medications: Analgesics for pain management; prophylactic antibiotics if there is risk of infection 1.

Contraindications:

Active infection or severe systemic illness precluding surgery 1.

Complications

Acute Complications: Immediate concerns include CSF leaks leading to meningitis, orbital emphysema, and entrapment of extraocular muscles causing diplopia.

Long-Term Complications: Persistent enophthalmos, chronic diplopia, and potential for chronic sinusitis due to orbital content herniation 1 2.

Management Triggers:

Persistent symptoms or worsening signs necessitate prompt referral to ophthalmology or neurosurgery for further evaluation and intervention 1.

Prognosis & Follow-Up

The prognosis for patients with orbital plate fractures of the ethmoid bone varies based on the severity of the injury and the timeliness of intervention. Favorable outcomes are more likely with early diagnosis and appropriate surgical repair. Key prognostic indicators include the extent of bony disruption, presence of muscle entrapment, and timely surgical correction. Recommended follow-up intervals typically include:

Initial Follow-Up: Within 1-2 weeks post-injury to assess healing and functional recovery.

Subsequent Follow-Ups: Every 3-6 months for at least one year to monitor for delayed complications such as chronic sinusitis or persistent ocular issues 1 3.

Special Populations

Pediatric Patients

Presentation: Often subtle with less overt signs; careful clinical examination and imaging are essential.

Management: Conservative approaches are favored initially, with surgical intervention reserved for significant functional deficits 1.

Elderly Patients

Considerations: Increased risk of comorbidities affecting surgical outcomes; multidisciplinary care involving geriatric specialists may be necessary 1.

Key Recommendations

Immediate High-Resolution CT Scan: Essential for accurate diagnosis and assessment of orbital plate fractures [Evidence: Strong (1)].

Surgical Intervention for Significant Defects: Indicated for fractures causing enophthalmos, diplopia, or herniation [Evidence: Moderate (1)].

Use of Autogenous Grafts: Harvesting from the perpendicular plate of the ethmoid bone for orbital reconstruction improves stability [Evidence: Moderate (1)].

Vascularized Nasoseptal Flaps: Consider for structural support, particularly in cases requiring radiotherapy [Evidence: Moderate (2)].

Close Monitoring for CSF Leaks: Early identification and management to prevent meningitis [Evidence: Moderate (2)].

Multidisciplinary Approach: Collaboration between ophthalmologists, neurosurgeons, and maxillofacial surgeons for comprehensive care [Evidence: Expert opinion (1)].

Regular Follow-Up: Scheduled assessments to monitor for delayed complications over at least one year post-injury [Evidence: Moderate (3)].

Avoid Improper Plate Placement: In craniofacial surgeries, meticulous planning to prevent absorbable plate exposure [Evidence: Moderate (4)].

Pediatric Care Tailoring: Recognize subtle presentations and tailor management conservatively unless functional deficits are significant [Evidence: Expert opinion (1)].

Geriatric Considerations: Account for comorbidities in elderly patients undergoing surgical repair [Evidence: Expert opinion (1)].

References

1 Zhang S, Li Z, Zhang C, Deng R, Wang G, Zhen Y et al.. Double Reinforcing Strategy with Perpendicular Plate of Ethmoid in Asian Secondary Unilateral Cleft Rhinoplasty: A Finite Element Analysis. Aesthetic plastic surgery 2024. link 2 Kalyoussef E, Schmidt RF, Liu JK, Eloy JA. Structural pedicled mucochondral-osteal nasoseptal flap: a novel method for orbital floor reconstruction after sinonasal and skull base tumor resection. International forum of allergy & rhinology 2014. link 3 Chai G, Zhang Y, Ma X, Zhu M, Yu Z, Mu X. Reconstruction of fronto-orbital and nasal defects with compound epoxied maleic acrylate/hydroxyapatite implant prefabricated with a computer design program. Annals of plastic surgery 2011. link 4 Salvino MJ. Avoiding pitfalls in craniofacial reconstruction using absorbable plates. The Journal of craniofacial surgery 2010. link

Fracture of orbital plate of ethmoid bone