Overview
Closed blow-out fractures of the orbital floor are traumatic injuries characterized by the rupture of the thin bony floor of the orbit, often resulting from blunt force trauma to the globe or midface. These fractures typically occur when force is transmitted through the orbital contents, leading to herniation of orbital contents into the maxillary sinus or other adjacent spaces. Clinical significance lies in the potential for significant functional and aesthetic sequelae, including diplopia, enophthalmos, hypoglobus, and infraorbital nerve dysfunction. Patients of all ages can be affected, but younger individuals and those involved in high-impact activities are at higher risk. Prompt recognition and appropriate management are crucial to prevent long-term visual impairment and cosmetic deformities, underscoring the importance of accurate diagnosis and timely intervention in day-to-day clinical practice 136.Pathophysiology
The pathophysiology of closed blow-out fractures of the orbital floor involves a cascade of mechanical events initiated by external force. When significant force impacts the globe or midface, it creates stress concentrations that exceed the structural integrity of the thin orbital floor, particularly at sites of weakness or preexisting anatomical variations. This stress leads to localized bone failure, resulting in fractures that allow orbital contents, such as fat and occasionally muscle, to herniate into the maxillary sinus or other adjacent spaces 3. The herniation can compress surrounding neurovascular structures, leading to symptoms like diplopia due to extraocular muscle entrapment and sensory deficits from infraorbital nerve damage. Over time, these mechanical disruptions can also cause secondary complications, including chronic inflammation and fibrosis, further impacting orbital function and aesthetics 13.Epidemiology
The incidence of orbital floor fractures, including blow-out fractures, varies geographically and by population characteristics. While precise global figures are limited, studies suggest that these injuries constitute a notable proportion of orbital trauma cases, often ranging from 10% to 30% of all orbital injuries 3. Younger adults and children are disproportionately affected, likely due to higher engagement in physical activities and sports. Males are typically overrepresented, reflecting gender differences in risk-taking behaviors and occupational hazards. Trends over time indicate an increasing awareness and reporting of these injuries, possibly due to advancements in imaging techniques and improved diagnostic capabilities. However, specific temporal trends in incidence rates are not consistently reported across different regions 3.Clinical Presentation
Patients with closed blow-out fractures of the orbital floor often present with a characteristic triad of symptoms: diplopia, enophthalmos (recession of the eyeball), and infraorbital nerve dysfunction manifesting as sensory loss over the cheek. Additional symptoms can include pain, swelling, ecchymosis, and in some cases, visual disturbances such as decreased visual acuity due to associated intraocular injuries. Red-flag features include severe persistent diplopia, significant enophthalmos greater than 3 mm, and signs of optic nerve injury such as visual field defects or optic disc swelling. These features necessitate urgent evaluation and intervention to prevent irreversible visual impairment 36.Diagnosis
The diagnostic approach for closed blow-out fractures of the orbital floor involves a combination of clinical assessment and imaging studies. Clinicians should perform a thorough ocular examination, including Hertel exophthalmometry for measuring enophthalmos, motility tests for diplopia, and sensory testing around the infraorbital nerve distribution. Imaging plays a pivotal role, with high-resolution CT scans being the gold standard. Key diagnostic criteria include:Management
Initial Management
Surgical Intervention
Complications
Management Triggers:
Prognosis & Follow-Up
The prognosis for patients with closed blow-out fractures of the orbital floor is generally favorable with timely and appropriate intervention. Key prognostic indicators include the severity of initial injury, prompt surgical correction when indicated, and adherence to post-operative rehabilitation protocols. Patients with mild to moderate injuries often achieve significant symptom resolution. However, those with severe herniation or delayed treatment may experience residual enophthalmos or diplopia. Recommended follow-up intervals typically include:Special Populations
Key Recommendations
(Evidence: Strong 6, Moderate 135)
References
1 Sarigul Sezenoz A, Zhao Z, Juntipwong S, Kim D, Aakalu V, Nelson C et al.. Clinical outcomes of 3-dimensional printed custom porous polyethylene orbital implant for reconstruction. European journal of ophthalmology 2025. link 2 Shen W, Cui J, Ji Y, Liangliang K, Chen J. Surgical Correction of Orbital Hypertelorism With Absorbable Plate Instead of Frontal and Orbital Bar and Inverted U-Shaped Osteotomy. Annals of plastic surgery 2024. link 3 Koryczan P, Zapała J, Wyszyńska-Pawelec G. Reduction in visual acuity and intraocular injuries in orbital floor fracture. Folia medica Cracoviensia 2015. link 4 Marbacher S, Andereggen L, Fandino J, Lukes A. Combined bone and soft-tissue augmentation surgery in temporo-orbital contour reconstruction. The Journal of craniofacial surgery 2011. link 5 Williams JV, Revington PJ. Novel use of an aerospace selective laser sintering machine for rapid prototyping of an orbital blowout fracture. International journal of oral and maxillofacial surgery 2010. link 6 Cheong EC, Chen CT, Chen YR. Broad application of the endoscope for orbital floor reconstruction: long-term follow-up results. Plastic and reconstructive surgery 2010. link