Lower Back & Leg Conditions
Lumbar Radiculopathy
Lumbar radiculopathy occurs when a nerve root in the lower back is irritated or compressed. It may cause radiating leg pain, numbness, tingling, weakness, or altered reflexes—often called sciatica.
Overview
Lumbar nerve roots leave the spinal canal and combine to serve the hips and legs. Radiculopathy describes dysfunction of one of these roots. Sciatica commonly refers to a lumbar nerve pattern involving pain through the buttock and leg, but radiculopathy may also produce sensory loss, weakness, or reflex change.
A herniated disc is a frequent cause, particularly when symptoms begin more suddenly. Foraminal or lateral-recess stenosis from disc-height loss, facet arthritis, bone spurs, scoliosis, or spondylolisthesis becomes more common with age. Inflammation can make a mechanically crowded nerve more symptomatic.
The involved root influences where symptoms travel and which muscles become weak. L3 or L4 problems may affect the thigh or knee; L5 often affects the outer leg, top of the foot, and ankle lifting; S1 often affects the back of the calf, outer foot, and push-off strength.
Because hip disease, neuropathy, vascular problems, and peripheral nerve entrapment can overlap, diagnosis requires clinical correlation. Treatment is based on neurologic function and quality of life—not an MRI finding by itself.
Symptoms
Pain is only one part of lumbar radiculopathy. The distribution of pain, sensory change, weakness, and reflex findings helps identify the responsible nerve root.
Radiating leg pain
Burning, electric, sharp, or shooting pain may travel from the back or buttock into the thigh, calf, ankle, or foot.
Numbness & tingling
Altered sensation may involve a characteristic region of the leg or foot and may persist after pain begins to improve.
Weakness
Difficulty lifting the ankle, climbing stairs, straightening the knee, pushing off, or controlling the toes can indicate motor involvement.
Back symptoms
Low-back pain may accompany the leg symptoms, but some patients have significant radiculopathy with little back pain.
Position-related change
Sitting, bending, standing, walking, coughing, or sneezing may aggravate symptoms depending on the cause and location of compression.
Functional limitation
Sleep, driving, work, exercise, and walking may be affected. A new foot drop or rapidly increasing weakness warrants timely evaluation.
Evaluation
Evaluation maps the symptom pattern to a specific nerve root and distinguishes radiculopathy from hip disease, peripheral neuropathy, vascular claudication, and peripheral nerve entrapment.
History
Clarifies distribution, onset, duration, positions, walking tolerance, weakness, and bowel, bladder, or saddle symptoms.
Neurologic examination
Tests strength, sensation, reflexes, gait, heel and toe walking, and functional movements.
Nerve-tension testing
May reproduce characteristic leg symptoms when an irritated lumbar nerve is gently tensioned.
X-rays
Show alignment, arthritis, disc-space loss, spondylolisthesis, scoliosis, or instability.
MRI
Defines discs, nerve roots, and canal or foraminal narrowing when persistent symptoms or deficits justify imaging.
EMG or additional testing
May help when imaging and symptoms do not agree or another nerve disorder is suspected.
Treatment
Treatment is matched to the cause, duration, severity, neurologic findings, and patient goals. Many episodes improve without surgery, but progressive motor loss changes the timeline.
Nonoperative treatment
Care aims to reduce nerve irritation, preserve strength, and restore activity while the underlying episode improves.
Activity & medication
Relative activity modification, walking as tolerated, and appropriate medication may help control a flare without prolonged bed rest.
Physical therapy
Treatment may address mobility, trunk and hip strength, nerve tolerance, movement mechanics, and graded return to activity.
Epidural injection
A targeted injection may reduce inflammation and provide temporary relief or diagnostic information but does not permanently enlarge the nerve pathway.
Operative treatment
Surgery may be considered for progressive or substantial weakness, cauda equina syndrome, or persistent disabling leg symptoms despite appropriate nonoperative care. The operation targets the specific source of nerve compression.
Discectomy
A microdiscectomy removes herniated material compressing the nerve when a disc is the cause.
Foraminotomy or decompression
Bone and ligament may be removed selectively when stenosis crowds the nerve root.
Decompression with fusion
Fusion is added only when instability, deformity, spondylolisthesis, or another structural factor requires stabilization.
Choosing the target
The procedure should match the symptomatic root and anatomy rather than every abnormality visible on imaging.
When to seek prompt evaluation
Progressive weakness changes the timeline.
Seek urgent evaluation for new bowel or bladder dysfunction, saddle numbness, rapidly progressive weakness, severe bilateral symptoms, or a new foot drop.
Mission Viejo · Orange County
Find the source of your leg symptoms.
Schedule an individualized spine evaluation with Omid Jalali, MD.