Transforaminal Epidural Steroid Injection

A transforaminal epidural steroid injection is a medical procedure aimed at alleviating pain and reducing inflammation by directly targeting the nerve root through an epidural spinal needle. This needle is directed towards the foramen, a side opening in the spine, granting direct access to the nerve root. The injection comprises three essential components: a local anaesthetic such as bupivacaine or lidocaine, steroids including triamcinolone acetate, methylprednisolone acetate, betamethasone acetate, or phosphate/dexamethasone phosphate, and a contrast solution. While the local anaesthetic provides immediate relief, the steroid component can offer longer-lasting effects, potentially extending over weeks or months. By focusing on the nerve root, this intervention addresses various spinal conditions, providing both short-term and potentially prolonged relief from discomfort and inflammation.

Which disorders can transforaminal epidural steroid injections treat?

Transforaminal epidural steroid injections (ESIs) serve as a viable treatment option for individuals experiencing nerve root pain stemming from various spinal conditions. These injections are indicated for conditions such as radiculitis, sciatica, herniated disc, degenerative disc disease, spinal stenosis resulting from spinal arthritis, bone spurs, spondylolysis, spondylolisthesis, thickening of the ligamentum flavum (a ligament connecting vertebrae), scoliosis causing irritation of spinal nerve roots, post-laminectomy syndrome, compression fractures, and nerve fiber damage following shingles or injury, along with cysts on the nerve roots. By delivering a combination of local anesthetic and steroids directly into the affected area, transforaminal ESIs aim to alleviate pain, reduce inflammation, and promote functional recovery. These injections are tailored to address specific underlying conditions, offering targeted relief and improved quality of life for individuals dealing with nerve root pain associated with diverse spinal disorders.

Preparation for A Transforaminal Epidural Steroid Injection

Preparation for a transforaminal epidural steroid injection involves several crucial steps to ensure the safety and efficacy of the procedure. Before undergoing the injection, individuals should communicate certain medical conditions to their doctor. This includes informing the doctor if they have diabetes managed with medication, have recently been hospitalised, are undergoing treatment for an infection with antibiotics, have tested positive for methicillin-resistant Staphylococcus aureus (MRSA), or if there is a possibility of pregnancy.

Moreover, if the individual takes blood-thinning medications (anticoagulants), it is imperative to notify the doctor at least 10 days prior to the scheduled injection. The doctor may recommend discontinuing these medications for a week or so before the procedure to minimize the risk of bleeding complications.

Understanding the procedure and its potential side effects or risks is essential for anyone undergoing a transforaminal epidural steroid injection. Patients should have a thorough discussion with their doctor to ensure they are fully informed and comfortable with the treatment plan. This comprehensive preparation helps optimise the safety and effectiveness of the injection while addressing any concerns or medical considerations specific to the individual's health status.

How painful is a transforaminal epidural steroid injection?

A transforaminal epidural steroid injection is typically made less painful as the doctor administers a local anesthetic to numb the site beforehand. While discomfort is usually minimal, patients should promptly inform the doctor if they experience significant pain during the procedure.

How Transforaminal Epidural Steroid Injection is done?

Here are the steps of the procedure:

The patient lies flat on their stomach, with their neck or back exposed.
The doctor cleans the injection site with an antiseptic solution, which may cause a cold sensation, and covers the area with sterile sheets.
A local anesthetic is injected into the injection site to numb the skin and underlying tissue. Patients may feel pressure or discomfort, but it should not be painful. Any pain experienced should be immediately communicated to the doctor.
Using X-ray, ultrasound, or a combination of both imaging tests, the doctor guides an epidural needle towards the treatment area. The size and depth of the needle insertion depend on the patient and procedure.
The needle is positioned in the foramen, the space in the spine where the nerve root is exposed.
Contrast fluid is injected to confirm proper needle placement.
Steroids and local anesthetic are injected through the needle into the epidural space.
The needle is removed, and pressure is applied to the site to prevent bleeding.

Step-by-Step Images: Transforaminal Epidural Steroid Injection

AP View

The first fluoroscopic view required for a Transforaminal Epidural Steroid Injection (TFESI) is the AP (Anteroposterior) view. Side determination and identification of the target spinal level should initially be performed in the AP view before proceeding further with needle trajectory planning.

Squiring & Oblique View

After confirming the target level in the AP view, the fluoroscope is adjusted to a slight oblique and squaring view to better visualize the neural foramen and facilitate safe needle trajectory planning for the Transforaminal Epidural Steroid Injection.

Target Location for TFESI

The target location for TFESI is the safe triangular zone of the neural foramen, typically positioned inferior to the pedicle and lateral to the exiting nerve root under fluoroscopic guidance.

Needle Entry Under Fluoroscopic Guidance

Under fluoroscopic guidance, the spinal needle is advanced carefully toward the target point within the neural foramen while maintaining safe trajectory and avoiding neural or vascular injury.

Needle Progression Under Tunnel View

Using the tunnel view, the needle is advanced in alignment with the fluoroscopic beam to ensure accurate trajectory toward the neural foramen while maintaining continuous visualization of needle depth and direction.

Confirmation of Needle Position under Lateral View

The final needle position is confirmed in the lateral fluoroscopic view to ensure appropriate depth and accurate placement within the posterior aspect of the neural foramen before contrast injection.

Contrast Injection

After negative aspiration, contrast dye is injected under real-time fluoroscopy to confirm epidural spread and exclude inadvertent intravascular or intrathecal needle placement before administering medication.

Epidural Contrast Characteristics

Characteristic epidural contrast spread appears as a smooth linear or feathered pattern outlining the exiting nerve root and epidural space without evidence of vascular runoff or subarachnoid spread.

Drug Injection & Needle Removal

Once satisfactory contrast spread is confirmed, the therapeutic medication is slowly injected into the epidural space, followed by careful needle removal and application of a sterile dressing at the entry site.

What is the recovery time following a transforaminal epidural steroid injection?

Following the procedure, patients typically spend 30 minutes to an hour in the hospital for recovery before being discharged with a companion. Pain at home may persist for one to two days, during which patients are advised to continue their regular pain medication regimen. It is recommended to gradually increase activity levels in the ensuing days to strengthen muscles, avoiding overexertion or extreme activities. This gradual progression should naturally lead to a point where patients feel comfortable returning to their usual level of activity.

How many epidural steroid injections can you have?

In most cases, one or 2 injections are enough; however, a few patients may require multiple injections. Doctors typically advise limiting the number of epidural steroid injections (ESIs) a person undergoes within a year, to a maximum of up to 4, although the exact count depends on individual circumstances. Several factors influence the allowable number of injections, including the recipient's characteristics, the specific location within the spine targeted for the injection, and the type of steroid employed. It's important to note that for some patients, the effects of transforaminal steroid injections can be long-term, meaning not all patients require multiple injections. Therefore, careful consideration and medical supervision are essential when determining the frequency and necessity of epidural steroid injections.

Risks of Transforaminal Epidural Steroid Injection

The risks associated with transforaminal steroid injections are typically rare, emphasizing its safety. Possible side effects may include flushing of the face and chest, increased temperature, sleep disturbances, changes in menstrual cycles, water retention, and anxiety. Additionally, rare complications may involve allergic reactions, infections, nerve damage, numbness or tingling, epidural bruising or abscess, temporary back or lower limb pain, adrenal suppression, postdural puncture headache, and extremely rarely, paralysis. Despite these potential risks, transforaminal epidural steroid injection is generally considered a safe procedure.