POSSIBLE CAUSES OF THAT PAIN IN YOUR BUM

Sciatica is one of the most common diagnoses that we see in physical therapy. But what exactly is sciatica and how do physical therapists treat this complex diagnosis? The simple answer is the treatment is all dictated by the source.

Generally, Sciatica is a term that is commonly used to describe pain, weakness, numbness, or tingling that radiates down the back of the leg. Typically, the symptoms follow the distribution of the sciatic nerve, but there can be some confusion as to the source of the pain especially when the patient’s symptoms are referred. Our job as PTs is to determine the source of the nerve irritation or referral origin and treat it accordingly. This is often accomplished with a thorough musculoskeletal exam and typically without the need for costly medical imaging. Alongside misalignment caused as a result from weak musculature of the hip, below are the most common causes of sciatica seen in PT and how we typically treat them.

1. Disc Herniation:

The most common source of sciatica is pressure on the sciatic nerve from a herniation or protrusion of a spinal disc. This pressure on the nerve can create an irritation and inflammatory response causing symptoms to radiate down the leg following the path of the nerve that is compressed.

What can physical therapy do to help patients with sciatica caused by a disc herniation?

• Studies have shown that patients respond well to repetitive lumbar range of motion in improving sciatica symptoms related to lumbar disc herniation. Typically the direction that most patients report relief of their symptoms is lumbar extension. However, a thorough physical therapy assessment will help decide a patient’s specific “directional preference”.
• Core stabilization exercises in conjunction with lumbar range of motion are also effective at reducing sciatica symptoms. PTs tend to focus on strengthening the transversus abdominis and gluteal muscles in both static and dynamic activities.
• Patient education is probably the most important component of the rehab of disc herniation. Patients are educated on proper sitting and standing postures as well as proper body mechanics with lifting activities to avoid causing further disc herniation.

2. Stenosis:

Narrowing of the space where the spinal cord or nerve roots exit the spinal canal is called stenosis. If the space is narrowed, that can create pressure on the cord or the nerves causing pain to radiate down the leg.

Stenosis is typically seen in a condition called degenerative disc disease. Our discs are located between the bony vertebrates and over time they can start to lose some of their height. This loss of height causes the narrowing of space seen in stenosis.

Another cause of stenosis is tiny little bone spurs called osteophytes that can form in the spinal cord or nerve root space.

What can physical therapy do to help patients with sciatica caused by stenosis?

• Our goal in PT is typically to help improve ROM in the lumbar spine to help open up the narrowed space. Patients with stenosis often respond well to lumbar flexion or bending exercises, which is in contrast to the lumbar extension exercises often seen in disc herniation. However, a thorough physical therapy exam will help determine the appropriate stretches/range of motion exercises.
• As with disc herniation, core stabilization and posture/movement retraining are important for patients with sciatica caused by stenosis.
• Functional dry needling (i.e. Trigger point dry needling) is also very effective for patients with lumbar stenosis. By using tiny, hair thin needles, we can quickly decrease the muscle tightness of spinal muscles, resulting in decreased compression of the lumbar vertebrae. We will discuss dry needling more in the last section.

3. Piriformis Syndrome:

Deep in your buttock/gluts is a muscle that runs diagonally from the outside of your hip to the lowest part of your spine. This muscle, called the piriformis, can get short and tight or even be in spasm. In 85% of the population, the sciatic nerve runs just beneath the piriformis and in the other 15% it runs through the muscle. The sciatic nerve can become compressed and irritated when the piriformis is taught or in spasm creating symptoms of sciatica down the back of the leg.

What can physical therapy do to help patients with sciatica caused by piriformis syndrome?

• Typically, a physical therapist will prescribe a thorough home exercise program that includes stretches for the piriformis, hamstrings, and glute muscles (see linked video for example of a piriformis stretch).
• Sciatic nerve glides/flossing can be effective at getting the sciatic nerve moving again if it is trapped by the piriformis, especially in conjunction with the stretches above (see linked video for example of a sciatic nerve glide).
• A common theme with all of the causes of sciatica is core stabilization. Core and glute strengthening exercises will help to reduce the demands put on the piriformis muscle with daily and recreational activities (see linked video for an example of a core exercise).
• Trigger point dry needling has also been found to be very effective at quickly reducing the tension of the piriformis.

HERNIATED DISCS

When people say they have a "slipped" or "ruptured" disk in their neck or lower back, what they are actually describing is a herniated disk-a common source of pain in the neck, lower back, arms, or legs.

Anatomy

Discs are soft, rubbery pads found between the hard bones (vertebrae) that make up the spinal column. The spinal canal is a hollow space in the middle of the spinal column that contains the spinal cord and other nerve roots. The discs between the vertebrae allow the back to flex or bend. Discs also act as shock absorbers.

Discs in the lumbar spine (low back) are composed of a thick outer ring of cartilage (annulus) and an inner gel-like substance (nucleus). In the cervical spine (neck), the discs are similar but smaller in size.

Cause

A disc herniates or ruptures when part of the center nucleus pushes through the outer edge of the dick and back toward the spinal canal. This puts pressure on the nerves. Spinal nerves are very sensitive to even slight amounts of pressure, which can result in pain, numbness, or weakness in one or both legs.

Risk Factors/Prevention

In children and young adults, discs have high water content. As people age, the water content in the discs decreases and the disks become less flexible. The discs begin to shrink and the spaces between the vertebrae get narrower. Conditions that can weaken the disc include:

• Improper lifting
• Smoking
• Excessive body weight that places added stress on the disks (in the lower back)
• Sudden pressure (which may be slight)
• Repetitive strenuous activities

Symptoms

Lower Back

Low back pain affects four out of five people. Pain alone is not enough to recognize a herniated disc. See your doctor if back pain results from a fall or a blow to your back. The most common symptom of a herniated disc is sciatica—a sharp, often shooting pain that extends from the buttocks down the back of one leg. It is caused by pressure on the spinal nerve. Other symptoms include:

• Weakness in one leg
• Tingling (a "pins-and-needles" sensation) or numbness in one leg or buttock
• Loss of bladder or bowel control (If you also have significant weakness in both legs, you could have a serious problem and should seek immediate attention.)
• A burning pain centered in the neck

Neck

As with pain in the lower back, neck pain is also common. When pressure is placed on a nerve in the neck, it causes pain in the muscles between your neck and shoulder (trapezius muscles). The pain may shoot down the arm. The pain may also cause headaches in the back of the head. Other symptoms include:

• Weakness in one arm
• Tingling (a "pins-and-needles" sensation) or numbness in one arm
• Loss of bladder or bowel control (If you also have significant weakness in both arms or legs, you could have a serious problem and should seek immediate attention.)
• Burning pain in the shoulders, neck, or arm

Diagnosis

To diagnose a herniated disc, your doctor will ask for your complete medical history. Make sure to tell him or her if you have neck/back pain with gradually increasing arm/leg pain. Tell the doctor if you were injured.

A physical examination will help determine which nerve roots are affected (and how seriously). A simple X-ray may show evidence of disc or degenerative spine changes.

MRI (magnetic resonance imaging) or CT (computed tomography) (imaging tests to confirm which disc is injured) or electromyography (a test that measures nerve impulses to the muscles) may be recommended if the pain continues.

Treatment

Nonsurgical Treatment

Nonsurgical treatment is effective in treating the symptoms of herniated discs in more than 90% of patients. Most neck or back pain will resolve gradually with simple measures.

• Rest and over-the-counter pain relievers may be all that is needed.
• Muscle relaxers, analgesics, and anti-inflammatory medications are also helpful.
• Cold compresses or ice can also be applied several times a day for no more than 20 minutes at a time.
• After any spasms settle, gentle heat applications may be used.

Any physical activity should be slow and controlled, especially bending forward and lifting. It is extremely helpful to partake in physical therapy, as all strengthening movements will be monitored and safe. This can help ensure that symptoms do not return-as can taking short walks and avoiding sitting for long periods. For the lower back, exercises may also be helpful in strengthening the back and abdominal muscles. For the neck, exercises or traction may also be helpful. To help avoid future episodes of pain, it is essential that you learn how to properly stand, sit, and lift.

If these nonsurgical treatment measures fail, epidural injections of a cortisone-like drug may lessen nerve irritation and allow more effective participation in physical therapy. These injections are given on an outpatient basis over a period of weeks.

Surgical Treatment

Surgery may be required if a disc fragment lodges in the spinal canal and presses on a nerve, causing significant loss of function. Surgical options in the lower back include microdiskectomy or laminectomy, depending on the size and position of the disk herniation.

In the neck, an anterior cervical diskectomy and fusion are usually recommended. This involves removing the entire disc to take the pressure off the spinal cord and nerve roots. Bone is placed in the disc space and a metal plate may be used to stabilize the spine.

For some patients, a smaller surgery may be performed on the back of the neck that does not require fusing the bones together.

Each of these surgical procedures is performed with the patient under general anesthesia. They may be performed on an outpatient basis or require an overnight hospital stay. You should be able to return to work in 2 to 6 weeks after surgery.