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Closed fracture of orbital floor — Clinical Guidelines

Overview

Closed fractures of the orbital floor are traumatic injuries characterized by bone disruption without direct exposure of orbital contents to the external environment. These fractures commonly result from blunt force trauma, often affecting the lower eyelid and causing functional impairments such as enophthalmos (recession of the eyeball) and diplopia (double vision), as well as aesthetic concerns like eyelid malposition. Individuals of all ages can be affected, with higher incidence noted in younger adults due to higher engagement in activities with risk of facial trauma. Prompt and accurate management is crucial to prevent long-term complications and ensure optimal functional and cosmetic outcomes, making this topic essential for clinicians managing facial trauma and oculoplastic surgery. 8 2

Pathophysiology

The pathophysiology of closed orbital floor fractures typically begins with blunt force trauma that transmits forces through the orbital rim, leading to bone disruption at the thinner orbital floor. This disruption often results in herniation of orbital contents, including fat, muscle, and extraocular muscles, into the maxillary sinus or the orbital cavity itself. The herniation can compress surrounding structures, leading to functional deficits such as enophthalmos and diplopia due to altered orbital volume and globe position. Additionally, the trauma can induce inflammatory responses and cicatricial changes, potentially causing chronic issues like eyelid malposition and further orbital asymmetry if not adequately addressed surgically. The mechanical properties of the orbital floor, influenced by factors like bone density and the integrity of surrounding soft tissues, play a significant role in determining the extent of injury and subsequent complications. 8 7

Epidemiology

The incidence of orbital floor fractures varies geographically and by demographic factors. Studies suggest that these injuries are more prevalent in younger adults, particularly those involved in sports or motor vehicle accidents. While precise global incidence rates are not universally reported, regional data indicate an annual incidence ranging from 10 to 30 per 100,000 individuals. Socioeconomic status (SES) appears to influence both the incidence and management outcomes; lower SES populations often exhibit higher rates of orbital floor fractures, possibly due to occupational hazards and less access to protective equipment. Additionally, disparities in surgical management have been noted, with uninsured and minority groups showing reduced use of synthetic orbital implants and different discharge outcomes, highlighting the need for equitable healthcare access. 2 5

Clinical Presentation

Patients with closed orbital floor fractures typically present with symptoms including orbital pain, swelling, bruising around the eye, and functional disturbances such as double vision and a sunken appearance of the eye (enophthalmos). Atypical presentations may include isolated eyelid malposition without significant pain or swelling, particularly if the fracture is subtle. Red-flag features include severe visual disturbances, significant proptosis (eye bulging), and signs of infection such as purulent discharge or increasing pain. Prompt recognition of these symptoms is crucial for timely intervention to prevent chronic complications. 8 1

Diagnosis

The diagnostic approach for closed orbital floor fractures involves a combination of clinical assessment and imaging techniques. Clinically, careful examination focusing on ocular motility, globe position, and eyelid symmetry is essential. Imaging, primarily computed tomography (CT) scans, is pivotal for confirming the presence and extent of the fracture, assessing herniated orbital contents, and planning surgical interventions. Specific criteria for diagnosis include:

Clinical Criteria:

- Presence of orbital trauma history - Signs of enophthalmos or diplopia - Eyelid malposition or asymmetry - Pain and swelling around the orbit

Imaging Criteria:

- CT scan demonstrating bone disruption at the orbital floor - Evidence of orbital fat herniation into the maxillary sinus or orbital cavity - Measurement of globe position (margin reflex distance) showing significant deviation from normal values (typically < 1 mm for normal MRD1)

Differential Diagnosis:

Orbital Hematoma: Presents with acute swelling and pain but lacks bony disruption on imaging.

Blowout Fracture (Open Orbital Floor Fracture): Involves direct exposure of orbital contents to the sinus, often with more severe symptoms and complications.

Idiopathic Orbital Inflammation: Presents with similar symptoms but lacks traumatic history and imaging findings consistent with bony injury. 8 2 4

Management

Initial Management

Clinical Stabilization: Ensure airway patency, manage pain, and address any signs of infection.

Imaging: Obtain a CT scan to confirm the diagnosis and assess fracture extent.

Surgical Repair

Timing: Ideally within the first 2 weeks post-injury to minimize complications like fibrosis.

Technique:

- Incision: Transconjunctival or subciliary approach, depending on the extent of injury. - Release Herniated Tissue: Thoroughly release any herniated orbital contents. - Implant Material: Use of autologous materials (e.g., titanium mesh, bone grafts) or synthetic implants to restore orbital volume and floor integrity. - Contouring: Ensure proper contouring and positioning of the implant to avoid postoperative complications like malposition or impingement.

Specific Steps:

- Autologous Materials: - Titanium Mesh: Custom-fitted using computer-assisted navigation for precise placement (depth ~25 mm). - Auricular Cartilage: Ensure defect size is appropriate to avoid mechanical failure (1.0× defect size optimal). - Synthetic Implants: Use cautiously due to potential late complications like silicone implant-related issues.

Postoperative Care

Moisture Chamber: Application of moisture chamber eyeglasses to prevent dry keratoconjunctivitis.

Monitoring: Regular follow-up to assess globe position, motility, and eyelid function.

Pain Management: Analgesics as needed, typically NSAIDs or opioids for acute pain.

Activity Restrictions: Avoid strenuous activities that could strain the orbital region for several weeks post-surgery.

Contraindications:

Active infection

Severe systemic illness precluding surgery

Inadequate imaging to plan surgical approach 8 3 5 7

Complications

Acute Complications

Incomplete Correction: Persistent enophthalmos or diplopia.

Malposition of Implants: Leading to functional or aesthetic issues.

Infection: Requires prompt surgical intervention and antibiotic therapy.

Long-term Complications

Late Deformation of Implants: Particularly with titanium mesh, as seen in delayed cases (e.g., 5 months post-surgery).

Silicone Implant Issues: Worsening diplopia, recurrent cellulitis, lower lid retraction, and orbital abscess formation over years post-implantation.

Cicatricial Contraction: Leading to eyelid malposition and functional impairment if not adequately addressed during surgery.

Management Triggers:

Persistent symptoms post-surgery

Imaging showing implant malposition or complications

Signs of infection (increased pain, swelling, purulent discharge) 5 9

Prognosis & Follow-up

The prognosis for patients with closed orbital floor fractures is generally good with timely and appropriate surgical intervention. Key prognostic indicators include the timing of surgery, completeness of orbital floor reconstruction, and absence of complications. Recommended follow-up intervals typically include:

Initial Follow-up: 1-2 weeks post-surgery to assess healing and initial functional outcomes.

Subsequent Follow-ups: Every 4-6 weeks for the first 3 months, then every 3-6 months for the first year to monitor long-term outcomes and address any delayed complications.

Long-term Monitoring: Annual evaluations to ensure sustained orbital symmetry and function.

Regular monitoring helps in early detection and management of any residual issues, ensuring optimal recovery. 8 2

Special Populations

Pediatric Patients

Considerations: Growth dynamics necessitate careful surgical planning to avoid compromising future orbital development.

Management: Often requires conservative initial management with surgical intervention deferred until growth stabilization.

Elderly Patients

Considerations: Increased risk of comorbidities and slower healing times.

Management: Tailored surgical techniques and postoperative care to accommodate reduced physiological resilience.

Socioeconomic Factors

Impact: Lower SES populations may face barriers in accessing timely and appropriate surgical care, potentially leading to worse outcomes.

Recommendations: Enhanced access to specialized care and socioeconomic support to mitigate disparities in treatment outcomes. 2 5

Key Recommendations

Timely Surgical Intervention: Repair within 2 weeks post-injury to minimize complications (Evidence: Strong 8).

Comprehensive Imaging: Use CT scans for accurate diagnosis and surgical planning (Evidence: Strong 2).

Thorough Release of Herniated Tissue: Ensure complete release to prevent recurrence of symptoms (Evidence: Moderate 8).

Custom-fitted Implants: Utilize computer-assisted navigation for precise placement of titanium mesh (Evidence: Moderate 4).

Postoperative Moisture Chamber: Apply moisture chamber eyeglasses to prevent dry keratoconjunctivitis (Evidence: Moderate 3).

Regular Follow-up: Schedule follow-up visits at 1-2 weeks, 1 month, 3 months, and annually to monitor outcomes (Evidence: Moderate 8).

Consider Autologous Materials: Prefer autologous materials like titanium mesh over synthetic implants due to lower complication rates (Evidence: Moderate 5 7).

Address Socioeconomic Disparities: Ensure equitable access to specialized care for all socioeconomic groups (Evidence: Expert opinion 2).

Monitor for Late Complications: Regularly assess for late implant deformation or silicone implant-related issues (Evidence: Moderate 5 9).

Individualized Care Plans: Tailor surgical and postoperative care for pediatric and elderly patients considering their unique physiological needs (Evidence: Expert opinion 5).

References

1 Zhao Y, Shi J, Ren B, Jin S, Chen W. Recovery of subcutaneous orbital fascia under preserved skin below the original crease in the repair of excessively high double-eyelid folds. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2024. link 2 Perla KMR, Zeyl VG, Lopez CD, Lopez J, Redett RJ, Manson PN et al.. Characterizing the Impact of Socioeconomic Status on Orbital Floor Reconstruction: A National Inpatient Sample (NIS) Analysis. The Journal of craniofacial surgery 2022. link 3 Zingaretti N, Piana M, Tarantini A, Lanzetta P, Parodi PC. A Simple Way to Apply Moisture Chamber Eyeglasses During Oculoplastic Surgery. Aesthetic plastic surgery 2022. link 4 Kang YF, Liang J, He Z, Zhang L, Shan XF, Cai ZG. Orbital floor symmetry after maxillectomy and orbital floor reconstruction with individual titanium mesh using computer-assisted navigation. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2020. link 5 Costa PJC, de Gauw JH, Costa Filho JZ, Moreira RT, Ribeiro Júnior PD. Late Complication Associated With the Treatment of Orbital Floor Fracture With Titanium Mesh. The Journal of craniofacial surgery 2018. link 6 Zhang WB, Mao C, Liu XJ, Guo CB, Yu GY, Peng X. Outcomes of Orbital Floor Reconstruction After Extensive Maxillectomy Using the Computer-Assisted Fabricated Individual Titanium Mesh Technique. Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons 2015. link 7 O TM, Richard MJ, Cullinane DM, Binetter DJ, Fay A, Der Sarkissian R. A Biomechanical Evaluation of Auricular Cartilage Autografts in Orbital Floor Defect Repair. Orbit (Amsterdam, Netherlands) 2015. link 8 Harris GJ. Avoiding complications in the repair of orbital floor fractures. JAMA facial plastic surgery 2014. link 9 Warrier S, Prabhakaran VC, Davis G, Selva D. Delayed complications of silicone implants used in orbital fracture repairs. Orbit (Amsterdam, Netherlands) 2008. link

Closed fracture of orbital floor