Failed back surgery syndrome (FBSS) is a term used to describe persistent or recurring pain in the back or legs after a lumbar spine surgery. Often, surgery is used to fix an anatomical problem, such as a herniated disc pushing on a nerve. Unfortunately, even in the hands of the most skilled surgeon, some patients will continue to have pain after the anatomical problem has been repaired. The exact number of patients who continue to have pain is not clear; however, more extensive surgeries and multiple operations appear to increase the risk of this syndrome.
There are many reasons why patients may continue to have pain. Low back pain is often from more than one source. For example, there may be pain coming from a herniated disc as well as from arthritis in the small joints, known as facet joints. After repair of one problem, pain may persist from the other. There can be a problem related to the surgery itself, such as a complication of hardware that was inserted or an infection. Pain may also be caused by continued degeneration of the discs and joints of the spine. Scar tissue formation (known as epidural fibrosis) and inflammation around the nerves (known as arachnoiditis) may also cause pain.
The best treatment for FBSS is prevention. Non-operative therapy should be the first step in treating low back pain, unless there is a clear anatomical problem that requires surgical intervention. Patients should be aware that even with a skilled surgeon, there is no guarantee of complete pain resolution from a low back surgery.
If a person develops FBSS, it is important to have a multidisciplinary approach to treatment of this complex problem. If there are no problems requiring surgical intervention, then multidisciplinary care involving physical therapy, medications and spinal injections should be pursued. Physical therapy should include not only treatments for pain, such as deep heat, but also muscular training exercises and instruction on how to do daily activities to prevent increased pain. FBSS therapy may also include spinal injections, such as injections around the nerves, discs or small joints in the back or neck. Epidural steroid injections are the most common, but there are several other injections that may be helpful for treatment or facilitating diagnosis.
There are some patients that do not respond to less invasive techniques, but they may benefit from more intensive treatments, including spinal cord stimulation or pain pump implantation. Spinal cord stimulation is frequently used for the leg pain associated with FBSS. A small lead is placed in the epidural space around the spinal cord and masks pain by producing a tingling or tapping sensation in the place where pain is felt. Before having the device implanted permanently, a screening trial is performed. A temporary lead is placed where the patient feels pain and they are able to test their response to the device. Once the device is permanently implanted, the patient can turn the device on and off, as well as make some adjustments to the stimulation they receive. Another treatment is pain pump implantation, also known as intrathecal drug delivery system implantation. This pump will place medication directly into the fluid around the spinal cord, which requires a much smaller dose of medication than when taken orally. Because the medication does not circulate throughout the body and a much smaller dose is used, the frequency of side effects is less. Morphine is the most commonly used medication in these pumps; however, other opioid and non-opioid medications can be used successfully.
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