Anatomy & Background
The vertebrae of the lumbar spine are the largest vertebra in the body because they carry the most weight and are subject to the greatest amount of stress. That being said, it is the area most frequently associated with back and leg pain.
The two lowest levels, (L4-L5) and (L5-S1), have the most flexion and extension motion stress, and the highest rate of injury. The intervertebral discs of these two levels also have the highest rate of disc degeneration and herniation. The L5 vertebra is the most common site of spondylosis and spondylolisthesis. The most common lumbar nerves that get pinched or entrapped are the L4, L5, S1 levels.
The spinal nerves are the electrical wires of the body. They originate at the spinal cord and exit the spinal column through the intervetebral foramen. Nerves exiting the area of the lumbar spine provide sensation and motor control to the back, buttocks, legs and down to the foot. Damage or interference with the conduction (transfer of information) of these nerves can cause neurological problems such as pain, weakness, abnormal sensations, numbness and changes in spinal reflexes. These symptoms may occur in the back, leg and down to the foot.
“Lumbar radiculopathy” is the pain and symptoms associated with compression on the nerve or nerve roots of the lumbar spine. When the symptoms radiate from the spine into the buttock and legs it is considered radiculopathy.
Causes of Lumbar Radiculopathy
Anything that encroaches on or puts pressure on a lumbar nerve or nerve root can be considered a cause of lumbar radiculopathy.
- Herniated discs place pressure on the nerve.
- Degenerative joint disease that results in the formation of bony spurs on the facet joints. This can narrow the intervertebral space placing pressure on the exiting nerve.
- Trauma or muscle spasms can put pressure on the peripheral nerve, producing symptoms along that nerve’s distribution system.
- Degenerative disc disease that results in wear-and-tear on the intervertebral disc. A reduction in disc height may result in loss of space at the intervertebral foramen compressing the exiting nerve.
- Tightness of the piriformis muscle that results in compression on the sciatic nerve lying under the muscle.
The symptoms experienced as a result of lumbar radiculopathy will be located along the path the affected nerve travels.
- Pain in the back or radicular to the buttock, into the leg and extending down and to the foot depending on the nerve involved and the severity of the encroachment.
- Pain and tenderness localized at the level of the involved nerve.
- Muscle spasms and changes in posture in response to the injury.
- Pain felt with excess activity and relief with rest.
- Pain and tenderness localized at the level of the involved nerve.
- Loss of motion: the inability to bend backward, move sideways to the effected side, or stand up for long periods of time.
- Sitting, standing and walking can be difficult if the irritation is severe.
- Impairment of normal reflexes in the lower extremities.
- Numbness or paraesthesia (tingling) may be experienced from the lower back and down to the foot depending on the distribution of the affected nerve.
- Muscle weakness may occur on any muscle that is innervated by the pinched nerve. Long-term pressure on the nerve can produce atrophy or wasting of that particular muscle.
Treatment of lumbar radiculopathy will depend on the severity of the condition, and the underlying cause of the nerve damage. When treating acute back problems:
- Rest: avoid any activities that produce the pain (bending, lifting, twisting, turning, bending backwards, etc).
- Anti-inflammatory drugs and other pain medications.
- Apply ice in acute cases to the lumbar spine to help reduce pain and associated muscle spasms. Apply ice right away and then at intervals for about 20 minutes at a time. Do not apply directly to the skin.
- An exercise regiment that is designed to specifically address the cause of the symptoms associated with sciatica and improve joint mobility, spinal alignment, posture, and range of motion.
- Steroidal medication to reduce inflammation in moderate to severe conditions.
- Lumbar nerve or epidural injections
- Physical therapy for back and disc problems must remain conservative at the onset to avoid aggravating the problem. The therapist should Emphasize rest, reducing the inflammation and increasing the blood circulation for healing. Once the initial inflammation has been reduced, a program of stretching and strengthening should be initiated to restore flexibility to the joints and muscles involved, while also improving strength and stability of the spine. Each program will be based on the structure causing the problem and symptoms so as to avoid further aggravation.
In mild cases rest, ice and medication were enough for many patients to reduce their pain. Physical therapy is recommended to develop a series of postural, stretching and strengthening exercises to prevent re-occurrence of the injury. Return to the activity that caused the problem should be gradual to prevent a return of symptoms.
Moderate to Severe Cases
If the problem persists, consult with your health care provider next. Your physician should perform a thorough evaluation to determine the possible cause of your symptoms, the structures involved, the severity of the condition, and the best course of treatment.
In addition to performing a thorough examination your physician may order the following tests to make a more concise diagnosis:
- X-ray to determine if there is any joint degeneration, fractures, bony malformations, arthritis, tumors or infection present.
- MRI to determine any soft tissue involvement, including visualization of the discs, spinal cord and nerve roots.
- CT scans, which can give a cross section view of the spinal structures.
Medications to consider
Your physician may recommend several medications individually or in combination to reduce the pain, inflammation and muscle spasms that may be associated with lumbar nerve irritation.
- Over the counter medications for mild to moderate pain.
- If over the counter medications are not effective, your physician may prescribe stronger pain medication.
- Anti-inflammatory drugs or prescription NSAIDS (non-steroidal anti-inflammatory drugs) to reduce inflammation following acute injury.
- Muscle relaxers to reduce acute muscle spasm.
- Injections like facet injections, nerve blocks or an epidural. These may involve the injection of corticosteroids to a specific structure to reduce local inflammation.
Severe or Non-responsive Conditions
In the case of conditions that do not respond to conservative care surgery may be indicated. If you continue to experience some of the following symptoms:
- An increase in radiating or radicular pain
- Pain or nerve irritation that gets worse
- Weakness associated with muscle atrophy
- Associated disc involvement
If symptoms continue to get worse, surgery may be indicated to release entrapment and remove the degenerative changes that are compromising the nerve.
Medical Procedures to consider
Injections like facet injections, nerve blocks or an epidural. These may involve the injection of corticosteroids to a specific structure to reduce local inflammation caused that is irritating the nerve roots of the Sciatic Nerve.
- Caudal Epidural Injections
- Interlaminar Caudal Epidural Steroid Injections
- Transforaminal Epidural Injections
- Selective Nerve Root Blocks
Surgical Procedures to address the structures that contribute to the compression on the nerve roots of the Sciatic Nerve
- Endoscopic Decompression
- Endoscopic Foraminotomy
- Percutaneous Decompression
- IDET Intradiscal Eletrothermal Therapy
- Selective Endoscopic Discectomy
- Spinal Cord Stimulator
- Epidural Lysis of Adhesions
- Laser Facet Arthrotomy