Silent Fractures, Severed Lines: Measuring the Impact: A Closer Look at Traumatic Cranial Nerve Injuries

Objectives: Traumatic cranial nerve injuries (TCNIs) are an under-recognized yet significant cause of long-term neurological disability following head trauma. Cranial nerves are particularly vulnerable to acceleration– deceleration forces, skull base fractures, and direct compressive injuries, resulting in sensory, motor, visual, auditory, and facial functional deficits. Although the reported incidence of cranial nerve injury ranges from 5% to 23% among patients with traumatic brain injury (TBI), most available literature focuses on severe head injury, with limited data addressing mild to moderate trauma. Early diagnosis is often challenging because cranial nerve deficits may be masked by associated injuries or may present in a delayed fashion. Functional outcomes vary considerably depending on the nerve involved. This study was undertaken to evaluate the incidence, pattern of involvement, management, and outcomes of TCNIs in patients with mild to moderate head injury at our institution and to compare the findings with published literature. To study the incidence, clinical pattern, management, and outcomes of TCNIs in patients with mild to moderate head injury and to compare the findings with established published series. Material and Methods: A prospective observational study was conducted between June 2024 and Dec 2025 at Government General Hospital (GGH), Guntur. During the study period, 1050consecutive patients with mild to moderate head injury (Glasgow Coma Scale [GCS] score 9–15) were screened, among whom 70 patients identified to have traumatic cranial nerve injury were included for Detailed clinical assessment; comprehensive cranial nerve examination, computed tomography (CT) of the brain, and relevant neuroimaging studies were performed. Patients were followed periodically to assess neurological recovery. Outcomes were compared with published studies and recent Indian prospective studies. Results: Young adult males constituted the majority of patients. Road traffic accidents were the most common mechanism of injury. Isolated cranial nerve involvement was more frequent than multiple cranial nerve involvement. Facial nerve injury was the most common cranial neuropathy, followed by oculomotor, optic, abducens, olfactory, and trochlear nerve injuries. Most patients were managed conservatively, while surgical intervention was required only in selected cases with compressive bony fragments or associated lesions. Functional recovery was more favorable in facial and abducens nerve palsies, whereas optic and olfactory nerve injuries demonstrated poorer recovery rates. The incidence of traumatic cranial nerve injury in our study and other contemporary series (15%). Similar to previous studies, there was a predominance of young adult males, with road traffic accidents being the commonest mode of injury. The facial nerve was the most frequently involved cranial nerve, followed by the oculomotor and optic nerves. Most patients had a favorable outcome with conservative management, whereas optic nerve injuries were associated with poorer visual outcomes, consistent with findings from the International Optic Nerve Trauma Study. Conclusion: Our institutional experience demonstrates that TCNIs, although relatively uncommon, contribute significantly to morbidity following mild to moderate head injury. The pattern of involvement is comparable with major published series, with young males, road traffic accidents, and facial nerve palsy predominating. Optic and olfactory nerve injuries are associated with poorer prognosis and require careful patient counseling. Routine cranial nerve screening and structured follow-up should be incorporated into standard head injury assessment protocols to facilitate early diagnosis and optimize outcomes.