Logan Steele
Epidural injections are commonly used to relieve pain or deliver anesthesia. While it is rare for an epidural to cause long-term or chronic back problems, it is believed that repeated long-term single or continuous epidural blocks can lead to adhesions in the epidural space, resulting in decreased efficacy of the epidural block. This has prompted the development of procedures such as epidural adhesiolysis or the Racz Procedure, which aim to treat chronic back or radicular pain caused by scar tissue formation and compression of nerves in the epidural space.
| Characteristics | Values |
|---|---|
| Definition | Epidural adhesions (EA) or epidural fibrosis (EF) is defined as non-physiologic scar formation secondary to a local inflammatory reaction provoked by tissue trauma in the epidural space. |
| Cause | Repeated long-term single or continuous epidural blocks can cause adhesions in the epidural space. |
| Treatment | Epidural adhesiolysis or the Racz Procedure is a treatment option for epidural adhesions. It involves inserting a catheter into the epidural space to break the adhesions and relieve pain. |
| Side Effects | The most common side effect is mild to moderate back pain at the injection site shortly after the procedure. Other less common but serious side effects include spinal cord compression, excessive intracranial pressure, bleeding, subdural injection, hematoma, or infection. |
| Effectiveness | There is strong evidence for short-term and moderate evidence for long-term effectiveness of epidural adhesiolysis in treating epidural adhesions. Most people experience significant pain relief, with a 50% or greater reduction in pain. |
| Alternatives | Spinal cord stimulation is an alternative to long-term epidural blocks for treating pain. |
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What You'll Learn
Epidural blocks and adhesions
Epidural blocks are injections near the spinal cord that relieve pain or deliver anaesthesia. They are generally considered safe and effective, with rare side effects and complications. However, repeated long-term single or continuous epidural blocks can cause adhesions in the epidural space, reducing the effectiveness of subsequent epidural blocks.
Adhesions in the epidural space refer to scar tissue formation, which can develop after frequent epidural blocks. This scar tissue can lead to decreased efficacy of epidural blocks and cause pain by irritating and compressing nearby nerve roots. The risk of adhesions is higher with frequent and continuous epidural blocks.
In the case study mentioned earlier, a 41-year-old man underwent lumbar epidural blocks more than 200 times to treat pain in his leg. As a result, adhesions formed in the epidural space, leading to decreased efficacy of the epidural block. The patient was advised to consider spinal cord stimulation instead of long-term epidural blocks to manage his leg pain.
To treat epidural adhesions, a procedure called epidural adhesiolysis or the Racz Procedure can be performed. This procedure involves inserting a catheter into the epidural space to dissolve and remove the scar tissue, reducing nerve irritation and pain. It is considered safe and effective, providing significant pain relief to most patients. However, there are potential risks, including infection, bleeding, spinal headache, and nerve injury.
In summary, while epidural blocks are generally safe, repeated and frequent blocks can lead to adhesions in the epidural space, reducing their effectiveness. Epidural adhesiolysis is an effective treatment for managing chronic pain associated with epidural adhesions, but it is important to consider the potential risks and benefits of the procedure.
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Epidural fibrosis and scar tissue
Epidural fibrosis, also known as spinal nerve scarring or failed back surgery syndrome, is a medical condition that can develop after spinal surgery. It is caused by the formation of excessive scar tissue in the epidural space, the area surrounding the spinal cord and nerves. This fibrous tissue is formed as part of the body's natural healing process, but it can lead to nerve compression, pain, and reduced spinal flexibility. The risk of developing symptomatic epidural fibrosis can be reduced through physical therapy, medication, and specific surgical procedures such as using a barrier between the nerve root and the healing tissues.
Scar tissue in the epidural space can cause pain and inhibit the distribution of medications to the area. The efficacy of treatments like epidural injections depends on removing this fibrotic tissue from the epidural space. Epidural fibrosis is purported to be a common cause of failed back surgery syndrome, with an incidence as high as 40%. The condition is challenging to treat due to the invasive nature of repeat surgeries and the limited efficacy of conservative treatments.
Recent research has explored alternative treatments for epidural fibrosis, such as shockwave therapy. This treatment uses acoustic waves to stimulate healing and reduce scar tissue formation. Studies in rat models have shown promising results, with improved mobility and reduced pain. However, more studies are needed to validate these findings in human subjects.
In summary, epidural fibrosis is a challenging complication of spinal surgery that can impact a patient's quality of life. While traditional treatments have limitations, emerging research on shockwave therapy provides hope for a more effective and less invasive solution.
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Chronic back pain
The formation of scar tissue in the epidural space can lead to chronic back pain by causing nerve compression and irritation. This can result in increased pressure and impaired circulation in the nerve fascicles, leading to hypoxic neuronal atrophy. The mechanical compression and inadequate perfusion can contribute to the pain experienced by patients with EF.
Epidural adhesiolysis, also known as the Racz Procedure, is a minimally invasive treatment option for chronic back pain caused by epidural adhesions. The procedure involves inserting a large-bore needle and catheter into the epidural space to access and lyse the fibrotic regions. Saline or medications such as steroids, local anesthetics, enzymes, and hypertonic saline are then utilized to dissolve the adhesions and reduce inflammation. The goal of the procedure is to mechanically and chemically break down the scar tissue, decrease nerve irritation, and reduce pain.
The Racz Procedure is considered safe and effective, and most people who receive the treatment experience significant pain relief. However, as with all medical interventions, there are potential risks and side effects. These can include mild to moderate back pain at the injection site shortly after the procedure, as well as more serious but less common complications such as spinal cord compression, excessive intracranial pressure, bleeding, infection, and nerve injury. It is important for patients to carefully consider the benefits and risks of the procedure and to follow the instructions provided by their healthcare provider.
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Treatment for adhesions
Spinal cord stimulation
This treatment involves placing an electrode into the epidural space, which can help reduce pain in the leg during daily activities. This was the treatment advised to a patient who had undergone epidural blocks over 200 times, resulting in adhesions and decreased efficacy of the epidural block.
Adhesiotomy or adhesiolysis
Adhesiotomy in the epidural space may help regain the effect of the epidural block. However, it is not a radical cure, and it may be difficult to achieve good-quality continuous epidural blocks if adhesions recur. Adhesiolysis is a similar procedure that can be used to treat chronic back or radicular pain that does not respond to conservative treatments. It involves inserting a large bore needle and catheter through the sacral hiatus and into the epidural space to access and lyse the adhesions.
Epidurolysis
This is a procedure used to alleviate pain and disability caused by epidural adhesions. It involves the mechanical dissolution of epidural fibrotic scar tissue, which can improve chronic back pain in one-third to one-half of patients with clinically symptomatic fibrous adhesions.
Epiduroscopy
This is a procedural technique that uses a flexible spinal endoscope to deliver medications and mechanically lyse adhesions under direct visualization. It is a newer technique that offers direct visualization of the epidural space and pathologic adhesions.
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Risks and side effects
While epidural injections are generally safe and effective, as with any medical procedure, there are risks and side effects that patients should be aware of.
One potential risk of receiving epidural injections is the development of adhesions in the epidural space. Adhesions are scar tissue formations that can occur after repeated and frequent epidural blocks. These adhesions can decrease the efficacy of the epidural block and may require further treatment. In some cases, patients have undergone more than 200 epidural blocks, resulting in adhesions observed through epiduroscopy.
Epidural adhesions can lead to chronic back or radicular pain that is difficult to treat with conservative methods. The scar tissue can form around nerve roots, causing unrelenting pain and nerve compression. This pain can radiate from the low back into the legs, and patients may experience increased discomfort and radiating pain due to mechanical compression and inadequate perfusion.
To alleviate the pain and disability caused by epidural adhesions, a procedure called epidurolysis or epidural adhesiolysis can be performed. This procedure involves inserting a large bore needle and catheter into the epidural space to access and lyse the adhesions. Saline or medications such as steroids, local anesthetics, enzymes, or hypertonic saline are used to dissolve the scar tissue and reduce inflammation. While this procedure has proven effective in treating chronic pain, there are potential risks, including mild to moderate back pain at the injection site, spinal cord compression, excessive intracranial pressure, bleeding, subdural injection, hematoma, or infection.
It is important to note that the development of adhesions and subsequent chronic pain is not a common occurrence after receiving epidural injections. Temporary back pain or tenderness at the injection site is normal and usually resolves within a few days. Additionally, the risk of long-term or chronic back problems due to epidural injections is very rare.
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Frequently asked questions
Epidural adhesions are scar tissue formations in the epidural space, which is the area between the inside of the spine and the protective layer around the spinal cord. Adhesions can form after spinal surgery, injury, inflammation, or disc herniation, and they can cause nerve compression and pain.
Repeated long-term single or continuous epidural blocks are believed to cause adhesions in the epidural space. This results in decreased efficacy of the epidural block. The exact mechanism is still under investigation.
Epidural adhesions can be treated through a procedure called epidural adhesiolysis or the Racz Procedure. It involves inserting a catheter into the epidural space to break down and dissolve the scar tissue, reducing nerve irritation and pain.
