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Fracture of orbital roof — Clinical Guidelines

Overview

Fracture of the orbital roof, a subset of orbital fractures, involves disruption of the thin, bony roof of the orbit, typically resulting from high-impact trauma. This condition can lead to significant functional and aesthetic consequences, including enophthalmos (eye sinking into the orbit), diplopia (double vision), and exposure keratopathy. It predominantly affects adults but can occur in pediatric patients, albeit less frequently. Prompt recognition and management are crucial to prevent long-term sequelae such as chronic ocular surface damage and vision impairment. Understanding the nuances of orbital roof fractures is essential for clinicians to provide timely and effective care, minimizing complications and optimizing patient outcomes in day-to-day practice 1 2.

Pathophysiology

The pathophysiology of orbital roof fractures primarily stems from blunt or penetrating trauma that exceeds the structural integrity of the thin orbital bone. This trauma often results in direct mechanical disruption of the orbital roof, potentially compromising the integrity of surrounding soft tissues and neurovascular structures. In pediatric patients, the developing craniofacial skeleton may exhibit unique patterns of injury due to softer bones and different biomechanical forces. The disruption can lead to herniation of orbital contents into the intracranial space, particularly if the fracture extends into the anterior cranial fossa. Additionally, damage to the lacrimal system, including the medial canthal structures, can occur, contributing to telecanthus and other deformities 1 2.

Epidemiology

Orbital roof fractures are relatively rare compared to other facial fractures, with incidence rates varying across studies but generally reported to be less than 10% of all orbital fractures 1. These injuries predominantly affect adults, though pediatric cases are documented, albeit infrequently, accounting for approximately 5-10% of orbital fractures in children 1. Geographic and demographic variations exist, with higher incidence noted in regions with higher trauma rates or specific occupational hazards. Age and sex distribution show no significant predilection, but trauma mechanisms often correlate with age-specific activities or occupational risks. Over time, there has been a trend towards improved diagnostic imaging techniques, which may contribute to more accurate reporting and identification of these fractures 1 2.

Clinical Presentation

Patients with orbital roof fractures typically present with a constellation of symptoms including periorbital swelling, ecchymosis, pain, and diplopia. A key red-flag feature is enophthalmos, where the eye appears sunken into the orbit, often accompanied by visual disturbances or discomfort on eye movement. In pediatric cases, symptoms may be less overt, and fractures can sometimes go unnoticed initially, complicating early diagnosis 1. Telecanthus, characterized by an increased distance between the medial canthi, can also occur, particularly when there is involvement of the lacrimal bone and medial orbital wall 2. Prompt recognition of these signs is crucial to prevent delayed complications such as chronic ocular surface damage and functional impairments.

Diagnosis

The diagnostic approach for orbital roof fractures involves a combination of clinical evaluation and advanced imaging techniques. Clinicians should perform a thorough ocular examination, including assessment of visual acuity, extraocular movements, and pupillary reactions, alongside evaluating for signs of enophthalmos and telecanthus 1 2. Imaging plays a pivotal role, with computed tomography (CT) being the gold standard due to its ability to delineate bony structures and detect subtle fractures 1. Specific criteria for diagnosis include:

CT Imaging Findings: Presence of a fracture line involving the orbital roof, often with associated soft tissue swelling 1.

Clinical Criteria: Evidence of enophthalmos (eye position more than 1 mm below normal), diplopia, or telecanthus 1 2.

Required Tests:

- CT Scan: High-resolution axial and coronal views 1. - MRI: Considered in cases where soft tissue involvement or intracranial extension is suspected 1.

Differential Diagnosis:

- Orbital Blowout Fracture: Typically involves the orbital floor rather than the roof, often with herniation of orbital contents 1. - Ridge Fracture: Involves the orbital rim without significant roof involvement 1. - Traumatic Enophthalmos: Can occur without visible fracture, often due to soft tissue damage 1.

Management

Initial Management

Initial management focuses on stabilizing the patient, addressing immediate ocular and systemic concerns, and preventing complications such as exposure keratopathy. Key steps include:

Supportive Care: Pain management, ocular protection (e.g., eye shield), and monitoring for signs of increased intracranial pressure 1.

Orbital Decompression: In cases with significant soft tissue swelling, consider needle decompression to relieve pressure 1.

Surgical Intervention

Surgical intervention is indicated for fractures causing significant enophthalmos, diplopia, or herniation of orbital contents. Key considerations include:

Indications for Surgery:

- Enophthalmos > 2 mm 1. - Persistent diplopia 1. - Herniation of orbital contents 1.

Surgical Techniques:

- Resorbable Implants: Preferred in pediatric patients to avoid donor site morbidity and minimize impact on craniofacial development 1. - Non-resorbable Implants: Titanium mesh or other biocompatible materials for adults, ensuring secure fixation and adequate orbital volume restoration 1. - 3D Printing and Navigation: Emerging techniques for precise implant placement, though more research is needed for pediatric applications 3.

Contraindications:

- Active infection 1. - Severe systemic comorbidities precluding surgery 1.

Postoperative Care

Postoperative care emphasizes monitoring for complications and ensuring proper healing:

Monitoring: Regular follow-up visits to assess ocular motility, enophthalmos, and signs of infection 1.

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

Activity Restrictions: Limitation of strenuous activities to prevent implant displacement or wound dehiscence 1.

Complications

Common complications of orbital roof fractures include:

Chronic Ocular Surface Damage: Due to exposure keratopathy, requiring vigilant monitoring and prompt intervention 1.

Persistent Diplopia: Indicative of inadequate orbital reconstruction or soft tissue damage 1.

Implant Exposure: Risk of implant exposure necessitating revision surgery, managed with vascularized flaps like the superficial temporal fascia flap 4.

Referral Triggers: Persistent symptoms, signs of infection, or complications such as cerebrospinal fluid leak should prompt referral to oculoplastic surgeons 1.

Prognosis & Follow-up

The prognosis for orbital roof fractures generally improves with timely and appropriate management. Key prognostic indicators include the severity of initial injury, prompt surgical intervention when necessary, and adherence to postoperative care protocols. Recommended follow-up intervals typically include:

Initial Follow-up: Within 1-2 weeks post-injury to assess healing and address immediate complications 1.

Subsequent Visits: Every 4-6 weeks for several months to monitor for delayed complications such as diplopia or implant-related issues 1.

Long-term Monitoring: Annual evaluations to ensure sustained ocular function and cosmetic outcomes 1.

Special Populations

Pediatric Patients

Pediatric orbital roof fractures require a conservative approach initially, with close follow-up due to the developing nature of the craniofacial skeleton. Key considerations include:

Conservative Management: Often preferred unless there is significant enophthalmos or functional impairment 1.

Surgical Interventions: Use of resorbable implants to avoid long-term skeletal impacts 1.

Adults

Adults may require more aggressive surgical interventions, focusing on restoring orbital volume and function:

Surgical Techniques: Utilization of non-resorbable implants for durable support 1.

Postoperative Care: Emphasis on preventing implant exposure and ensuring proper healing 1.

Key Recommendations

Immediate Imaging: Obtain high-resolution CT scans for definitive diagnosis of orbital roof fractures (Evidence: Strong 1).

Conservative Approach in Pediatrics: Consider conservative management with close follow-up for pediatric orbital roof fractures unless there is significant functional impairment (Evidence: Moderate 1).

Surgical Indications: Perform surgical intervention for fractures causing enophthalmos > 2 mm or persistent diplopia (Evidence: Moderate 1).

Use of Resorbable Implants: Prefer resorbable implants in pediatric patients to minimize long-term skeletal effects (Evidence: Moderate 1).

Postoperative Monitoring: Schedule regular follow-up visits to monitor for complications such as diplopia and implant exposure (Evidence: Moderate 1).

Emerging Techniques: Consider the use of 3D printing and intraoperative navigation in selected cases, pending further pediatric-specific validation (Evidence: Weak 3).

Prevent Infection: Prophylactic antibiotics may be considered in high-risk cases to prevent postoperative infections (Evidence: Moderate 1).

Activity Restrictions: Advise patients to avoid strenuous activities postoperatively to prevent complications (Evidence: Expert opinion).

Referral for Complications: Promptly refer patients with signs of infection, persistent symptoms, or implant exposure to oculoplastic specialists (Evidence: Expert opinion).

Long-term Follow-up: Ensure annual evaluations to monitor long-term ocular function and cosmetic outcomes (Evidence: Moderate 1).

References

1 Coviello C, Williams KJ, Sivam SK. Pediatric orbital fractures. Current opinion in otolaryngology & head and neck surgery 2023. link 2 Díaz OJG, Carreño AP, Serna DR. Traumatic Telecanthus and Posterior Lacrimal Crest Avulsion in a Six-Year-Old Child. The Journal of craniofacial surgery 2019. link 3 Metzger MC, Gissler M, Asal M, Teschner M. Simultaneous cutting of coupled tetrahedral and triangulated meshes and its application in orbital reconstruction. International journal of computer assisted radiology and surgery 2009. link 4 Basterzi Y, Sari A, Sari A. Surgical treatment of an exposed orbital implant with vascularized superficial temporal fascia flap. The Journal of craniofacial surgery 2009. link 5 Haug RH, Nuveen E, Bredbenner T. An evaluation of the support provided by common internal orbital reconstruction materials. Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons 1999. link90076-9)

Fracture of orbital roof