Overview

A temporal bone fracture is a serious injury to the temporal bone, which is the part of your skull located around your ear. This bone protects your ear structures, including those responsible for hearing and balance, as well as the facial nerve, which controls your facial movements. These fractures usually happen after a significant head injury, and often, other injuries inside the head (known as intracranial injuries) might be present and need urgent attention first.

Because the temporal bone is so close to vital structures, a fracture in this area can lead to a range of complications affecting your hearing, balance, and facial movement. While many head injuries heal on their own, temporal bone fractures require careful assessment and sometimes specific treatments to manage these potential issues.

Symptoms and Causes

Temporal bone fractures are a direct result of trauma to the head. The symptoms you might experience depend on which part of the temporal bone is affected and how severe the injury is.

Symptoms

If you have a temporal bone fracture, you might notice several signs and symptoms. These can include:

• Bruising behind the ear (Battle's sign): This looks like a bruise over the mastoid bone, which is the bony lump behind your ear. It's a sign that there might be bleeding under the skin from a skull fracture.
• Blood behind the eardrum (Haemotympanum): This means there's blood collected in the middle ear space, behind your eardrum. It can make your eardrum look blue or purple when a doctor examines it.
• Leaking fluid from the ear or nose (CSF leak): Sometimes, a clear, watery fluid might leak from your ear (called otorrhoea) or your nose (called rhinorrhoea). This fluid is cerebrospinal fluid (CSF), which normally surrounds and protects your brain and spinal cord. A leak means there's a small opening between the inside of your skull and the outside.
• Weakness or paralysis of the face (Facial nerve palsy): The facial nerve runs through the temporal bone. If it's injured, you might find it difficult to move parts of your face, such as smiling, closing your eye, or raising your eyebrow on one side. This can range from slight weakness to complete inability to move that side of your face.
• Hearing loss: This can happen in different ways. Sometimes, it's due to blood in the middle ear or damage to the tiny bones that help you hear (ossicles). Other times, it can be due to damage to the delicate inner ear structures responsible for converting sound into nerve signals.
• Dizziness or a spinning sensation (Vertigo): The inner ear also contains structures that help with balance. If these are affected, you might feel dizzy, unsteady, or as if the world is spinning around you.
• Involuntary eye movements (Nystagmus): This is when your eyes make repetitive, uncontrolled movements, often a sign of issues with your balance system.
• A hole in the eardrum (Tympanic membrane perforation): The force of the injury can sometimes tear your eardrum.
• Bruising around the eyes (Raccoon eyes): Similar to Battle's sign, this bruising around the eyes can also indicate a fracture at the base of the skull.

Causes

Temporal bone fractures are caused by significant head injuries. These injuries often result from:

• Direct blows to the side of the head: These types of impacts often lead to what are called "longitudinal fractures," which run along the length of the temporal bone. These are the most common type, accounting for about 80% of temporal bone fractures, and often cause conductive hearing loss (problems with sound reaching the inner ear).
• Impacts to the front or back of the head (fronto-occipital trauma): These can cause "transverse fractures," which run across the temporal bone. These are less common (about 20%) but carry a higher risk of damaging the facial nerve and the delicate inner ear structures (otic capsule), which can lead to more severe hearing loss and balance problems.
• Other severe head traumas: Such as those from road traffic accidents, falls from a height, or assaults.

It's important to remember that these fractures are always a result of considerable force to the head.

Diagnosis and Investigations

Diagnosing a temporal bone fracture involves a careful examination by doctors and specific imaging tests. Because these fractures are often part of a more significant head injury, the initial focus is always on managing any life-threatening issues first, following established emergency care guidelines.

Diagnosis

When you arrive at the hospital, the medical team will first ensure your overall condition is stable. Once stable, a detailed assessment will be carried out, which includes:

• Clinical examination: Doctors will perform a thorough check, including looking for signs of a basal skull fracture (a fracture at the base of the skull, which includes temporal bone fractures). They will specifically examine your face for any weakness or paralysis, and your ears and nose for any signs of fluid leakage or blood.
• Otoneurological examination: This is a specialised examination focusing on your ears, balance system, and the nerves connected to them. It includes:
• • Cranial nerve assessment: Checking the function of all your cranial nerves, especially the facial nerve, to see if there's any weakness or loss of movement.
  • Otoscopy: This is when a doctor looks inside your ear with a special light (an otoscope) to check your eardrum for any perforations (holes) or blood behind it (haemotympanum).
  • Tuning fork tests (Weber and Rinne's tests): These simple tests use a vibrating tuning fork to help determine the type of hearing loss you might have.
• History taking: The medical team will ask about how the injury happened and any symptoms you've noticed since.

If facial weakness is observed, it's considered an urgent matter, and an ENT (Ear, Nose, and Throat) surgeon will need to provide advice on the same day.

Investigations

To confirm a temporal bone fracture and understand its extent, several investigations may be performed:

• CT scan of the head: This is a crucial imaging test that uses X-rays to create detailed pictures of your brain and skull. For any signs of a basal skull fracture, a CT scan of the head is usually performed within one hour, following national guidelines. This scan helps to identify the fracture and check for any associated brain injuries, such as an extradural haemorrhage (a collection of blood between the skull and the outer covering of the brain), which can be very serious and require urgent surgery.
• High-resolution CT scan of the temporal bones: If a temporal bone fracture is suspected or confirmed, a more detailed CT scan focusing specifically on the temporal bones might be done. This scan provides very fine images of the delicate structures within and around your ear, helping doctors to see the exact path of the fracture, whether it involves the inner ear structures (otic capsule), or the canal where the facial nerve runs.
• Beta-2 transferrin test: If there's a clear, watery fluid leaking from your ear or nose, this test can confirm if it is cerebrospinal fluid (CSF). This is important for guiding treatment.
• Electroneuronography (ENoG): If you have complete facial paralysis, this test might be performed. It measures the electrical activity of the facial nerve to assess how much damage has occurred.

Management and Treatment

The management of temporal bone fractures is comprehensive and often involves a team of specialists. The initial priority is always to address any life-threatening head injuries. Once stable, the focus shifts to managing the temporal bone fracture and its potential complications.

Patients with confirmed temporal bone fractures are typically admitted to the hospital under the care of a trauma team. They will undergo regular neurological observations to monitor for any changes in their brain function and receive a multidisciplinary assessment, meaning different specialists will review their condition.

Here's how specific complications are managed:

• Cerebrospinal Fluid (CSF) Leaks:
• • Most CSF leaks, which occur in up to a third of patients, resolve on their own with conservative management. This usually involves bed rest and measures to reduce pressure inside the head.
  • If a CSF leak persists beyond five days, a lumbar drain might be used. This is a small tube inserted into your lower back to temporarily drain CSF, which can help reduce pressure and allow the leak to close.
  • Surgical closure is considered a last resort if conservative methods and lumbar drains don't stop the leak.
  • It's important to know that routine antibiotics to prevent meningitis (a serious infection of the brain and spinal cord coverings) are generally not recommended for CSF leaks, as studies show a low rate of meningitis in these cases.
• Facial Nerve Palsy (Weakness or Paralysis):
• • Eye protection: If your eyelid on the affected side can't close properly, eye drops (like Viscotears) and lubricating ointment (like Lacrilube) are crucial to protect your eye from drying out and potential damage.
  • Delayed onset palsy: If facial weakness appears a few days after the injury and is not complete, it often indicates swelling around the nerve. A five-day course of steroid medication (prednisolone 60mg) may be prescribed to reduce this swelling.
  • Immediate complete palsy: If you experience complete facial paralysis right after the injury, it suggests the nerve might be severely damaged or even cut. Imaging will be used to check for clear nerve transection (cutting) or impingement (pinching). In such cases, early surgical intervention might be considered to repair or decompress the nerve, especially if electroneuronography shows significant nerve degeneration (more than 95% within 14 days).
• Hearing Loss:

• • Any detected hearing loss will require follow-up with an ENT clinic.
  • Patients with persistent hearing loss should be referred for hearing aids to help improve their ability to hear.
  • Sometimes, elective surgery (planned surgery, not an emergency) such as an ossiculoplasty (surgery to repair the tiny hearing bones in the middle ear) may be considered later to improve hearing.
• Vertigo (Dizziness):
• • Vertigo is common after temporal bone fractures. Vestibular rehabilitation, which involves specific exercises designed to help your brain adapt to balance problems, should be offered early.
  • Medications that suppress the vestibular system (vestibular suppressants) should generally be avoided, as they can hinder the brain's natural recovery process.
  • If vertigo is caused by a perilymph fistula (a leak of inner ear fluid), a tympanotomy (a surgical procedure to look behind the eardrum) might be performed to repair the leak.
• Extradural Haemorrhage:
• • This is a collection of blood between the skull and the outer covering of the brain, often caused by a temporal bone fracture tearing an artery. It can develop hours after the injury and typically requires urgent surgical drainage to relieve pressure on the brain.

Prevention

Temporal bone fractures are a direct result of significant head trauma. Therefore, preventing these fractures largely involves preventing head injuries in general. While it's impossible to prevent all accidents, you can significantly reduce your risk by:

• Wearing appropriate safety gear: Always wear a helmet when cycling, motorcycling, skateboarding, or participating in sports where head injury is a risk.
• Using seatbelts: Always wear a seatbelt when travelling in a car.
• Ensuring child safety: Use appropriate car seats and restraints for children.
• Practising fall prevention: Especially for older adults, taking steps to prevxent falls at home (e.g., removing tripping hazards, improving lighting, using handrails) can reduce the risk of head injuries.
• Avoiding risky behaviours: Be mindful of activities that could lead to head trauma.

These measures are crucial for protecting your head and brain from serious injury.

Outlook / Prognosis

The long-term outlook after a temporal bone fracture can vary greatly depending on the severity of the injury and whether complications developed. Many basal skull fractures, including those involving the temporal bone, can heal without specific treatment, especially if they are stable and don't cause immediate complications.

However, it's important to be aware that long-term complications are frequent and can sometimes be disabling. These may include persistent hearing loss, ongoing balance problems (vertigo), or facial weakness. Regular follow-up with an ENT specialist is crucial to monitor your recovery and address any lingering issues.

For those experiencing persistent problems:

• Hearing loss: If hearing loss continues, you will be referred for hearing aids. In some cases, elective surgery, such as ossiculoplasty (to repair the small bones in the middle ear), might be considered later to improve hearing.
• Persistent CSF leaks: If a cerebrospinal fluid (CSF) leak doesn't resolve on its own, surgical intervention may be necessary to stop the flow and prevent potential complications like infection.
• Balance problems: Vestibular rehabilitation exercises can be very effective in helping your brain adapt to any lasting balance issues.
• Facial nerve recovery: The recovery of facial nerve function can be slow and sometimes incomplete, depending on the extent of the initial injury. Your medical team will guide you on potential therapies and, if needed, further interventions.

While the journey to recovery can be challenging, with appropriate medical care, rehabilitation, and sometimes elective surgeries, many people can manage their symptoms and improve their quality of life after a temporal bone fracture. Your medical team will work closely with you to develop a personalised plan for your recovery and long-term management.