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There are other causes of sciatica that are not spine-related. It is sometimes called non-spinal pathology, which means not related to the spine. The most common cause of sciatic pain is a herniated disc. Non-spine-related causes of sciatica can imitate/copy the symptoms of a herniated disc in the low back. When a lumbar herniated disc causes sciatica, people typically report a sudden onset of pain with leg pain worse than any back pain that might be present. In addition to pain in the leg, there are also reports of leg weakness, numbness, and tingling. Leg pain becomes worse after:
Long periods of sitting/standing
Body maneuvers that increase pressure in intervertebral discs
Individuals also report when lying down and the spine is extended the back pain reduces and alleviates the pain. Determining the source of sciatica pain correctly means that it is important to:
Characterize the activities leading up to when the symptoms first presented
Location of the pain
Associated factors that reduce and worsen the pain
Because there are quite a few non-spine-related causes, it can be helpful to keep in mind:
The way the sciatic nerve runs through the lower body. It starts in the lower lumbar and upper sacral nerve roots. It exits through the pelvis and runs down the back of the thigh to the knee where it branches out into nerves that provide the motor and sensory functions to the legs and feet.
Non-spinal sciatica causes. Non-spinal causes usually are the result of irritation of the nerve itself. The most common ways to irritate the nerve is compression, traction, or injury.
Symptoms perceived as sciatica may not be related to the nerve at all. Injury/s to structures close to the nerve, like the hip, can copy symptoms caused by irritation of the nerve.
Hip joint disorders can emulate sciatica symptoms
Because the sciatic nerve is close to the hip joint, an injury to the hip could resemble symptoms of sciatica. Whatever the cause of the hip injury, those with hip pathology often report pain in the groin, upper thigh, and buttocks. The pain gets worse with activity, specifically bending, and rotation of the hip.
Leg pain that turns into a limp when walking means that more likely the hip, and not the lower back, is the cause of the leg pain. X-rays and if necessary MRIs of the hip can help in determining if the hip is the cause of leg pain. An example of hip pathology that mimics spine-related sciatica:
This is characterized by the loss of cartilage. This results in the narrowing of the ball and socket joint. Individuals with arthritis of the spine and hip, a doctor could use a steroid injection as a therapeutic providing pain relief and a diagnostic to help identify the root cause/pain generator.
The femoral head can collapse from a lack of blood flow. Risk factors include:
Sickle cell disease
Chronic steroid use
Femoral neck fracture
This can stem from constant abnormal rubbing between the femoral neck and acetabulum from a bone deformity of the femur, or the acetabulum. Hip impingement at the joint can start the onset of arthritis along with tears of the labrum. This is cartilage that surrounds the hip joint and provides stability.
There are fluid-filled sacs called bursas/bursae that help decrease friction between the bones, surrounding tendons, and muscles. They are at multiple locations on the body. Bursitis means that the bursa is inflamed and can be quite painful. The greater trochanter is a bony outward bump that extends from the femur. Trochanteric bursitis refers to inflammation of the bursa that separates the greater trochanter with the muscles and tendons of the thigh. Common symptoms are pain on the outside of the thigh that worsens by pressing on the area and can interfere with proper sleep when lying on the affected side.
Femoral Neck Stress Fracture
Incomplete fracture/s of the femoral neck typically occur in individuals that walk or run long distances regularly like runners and soldiers. The pain is usually focused around the groin and can be subtle when it presents. Walking or running makes the pain worse.
Sacroiliac joints and fractures
The sacroiliac joints connect the spine to the pelvis. There are two joints, one on either side of the sacrum. While they are relatively immobile, they go through tremendous force doing routine daily activities. Sacroiliac joint pathology that can mimic spine-related sciatica include:
This is inflammation of the sacroiliac joints. The pain presents in a slow fashion with no obvious injury or cause. The pain is usually localized to the buttocks and can radiate down the back of the thigh. It is believed to be caused by irritation of the sciatic nerve by the inflammatory molecules in the sacroiliac joint or could present as referred pain from the joint. This is pain that is detected in a location other than the area of the pain generator. The pain reduces with light walking.
A fracture of the sacrum can occur in those with a weakened bone after a minor injury and without trauma. Risk factors include:
Chronic steroid use
Vitamin D deficiency.
The pain usually localizes in the low back that radiates to the buttocks, or groin, and worsens with activity.
Trauma to the pelvis or thigh can definitely cause sciatica pain and symptoms. With high-energy injuries, it is possible for the nerve roots of the sciatic nerve to get pulled or torn. More common causes include:
Posterior hip dislocation
The hamstring muscles are in close proximity to the sciatic nerve. A torn hamstring can irritate the sciatic nerve either through direct compression from the localized bleeding known as a hematoma or from an inflammatory response triggered when the injury happened.
If some sharp object like a tool or shrapnel penetrates any area where the sciatic nerve is, it could cause sciatica by cutting the nerve. Or the object tears the nerve, known as a laceration. Most cases of trauma-induced sciatica result from a mild form of nerve injury known as neuropraxia. This is an injury that temporarily blocks nerve function. Neuropraxia can develop from the shock waves that surround the object as it travels through the tissue.
Benign tumors and metastatic cancer
Discovering cancer during diagnosis for sciatica is rare. Symptoms that increase the possibility of cancer being the cause include:
Cancer in medical history
50 years and older
Leg pain that goes on through the night
No relief from lying on the back
Unexplained weight loss
When back pain presents in a subtle fashion without a history of trauma or injury and is not affected by activity or changes in position can also suggest cancer as the cause. Tumors usually cause sciatica by applying direct compression on the nerve. They can be benign or malignant. Tumor/s can arise from the sciatic nerve itself:
Shingles is a painful rash that occurs on one side of the body. It is caused by the varicella-zoster virus, which is the virus that causes chickenpox. The virus can lie dormant in nerve cells for years without causing any symptoms. Older individuals and individuals with underlying conditions in an immunocompromised state can cause the virus to activate. If the virus reactivates around the buttock and thigh, it can feel like sciatica. The presence of a red rash with blisters around the painful area is consistent with shingles.
Childbirth and endometriosis
During pregnancy, the pelvis can become compressed between the growing baby and the bones in the pelvis. Also, having the hips and knees flexed and supported in stirrups too long can also cause sciatica. However, pregnancy-related sciatica is often temporary.
A less common cause that occurs in women is endometriosis. Endometriosis is the growth of tissue somewhere other than the uterus, usually the ovaries and fallopian tubes. In some cases, this tissue can accumulate around the sciatic nerve or the nerve itself. As the tissue responds to the changes taking place during a normal menstrual cycle, recurrent sciatica pain can present.
Arteries and veins in the pelvis and lower extremities that have become abnormal can cause sciatica. Either through compression or lack of oxygen from poor blood flow. An aneurysm can happen when the wall of the artery weakens and cannot withstand the pressure of the blood flowing through. This enlarges the artery and in some cases, the artery grows large enough to compress the nerve.
Peripheral artery disease can cause sciatica when not enough blood is circulated from the heart to the muscles in the legs. If not enough oxygen is delivered to the muscles, leg pain and numbness can occur. It’s called claudication and is characterized by pain that is aggravated when walking and relieved when standing still. Risk factors for peripheral artery disease include:
Smokers both current and those who have quit
High blood pressure
Diabetes/high blood sugar
Diabetic peripheral neuropathy happens from nerve damage caused by high blood sugar. Nerves that are exposed to chronic high blood sugar can get damaged from the disruption of proper blood flow or from an alteration of the cellular structure of the nerve.
Nerve and muscle damage can happen as a side effect from prescription meds. Neuropathy and myopathy can cause symptoms that mimic sciatica brought on by disc herniation. Sometimes, if the medication is no longer taken the symptoms go away. The list of medications include:
Statins medication to help lower cholesterol
Piriformis syndrome and back pocket wallets
The piriformis muscle originates on the sacrum, runs through the sciatic notch, shown above, and attaches the top of the femur. The sciatic notch also includes the sciatic nerve. Piriformis syndrome is caused when the piriformis muscle compresses the sciatic nerve. Individuals typically report pain in the buttocks that shoots down the same leg and is made worse when sitting. Piriformis syndrome can be difficult to diagnose, but physical exam maneuvers have been developed in aiding the diagnosis of the syndrome. They involve some form of hip abduction resistance and external rotation to cause a contraction of the piriformis muscle.
Back pocket wallet
Also known as wallet neuritis, and wallet sciatica are terms that have been used to describe compression of the sciatic nerve by a heavy/bulky wallet in a back pocket. It is similar to symptoms of piriformis syndrome and presents in the buttocks and the same leg that can get aggravated from sitting. Usually, if the wallet is the sole cause, taking the wallet from the back pocket to another pocket or other storage option often brings pain relief.
Conclusion non-spine related causes
While the majority of sciatica cases are caused by a back problem, injury, etc. There are various causes outside of the spinal column. Being able to describe the:
Factors that aggravate and alleviate the pain
These can absolutely help your doctor, chiropractor, specialist accurately diagnose and generate an optimal customized treatment plan for spine-related or non-spine-related sciatica.
Chiropractors & Sciatica Syndrome Expose
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