Sciatica and Lumbar Radiculopathy

Sciatica is a symptom, not a diagnosis

"Sciatica" describes pain radiating along the path of the sciatic nerve — usually down the back of the thigh, sometimes past the knee into the calf or foot. It tells you where the pain travels. It does not tell you why.

That distinction is the whole game. Radiating leg pain can come from a compressed nerve root in the lumbar spine, from the joints of the spine referring pain, from the hip, from the pelvis, or from the nerve being irritated somewhere along its course after it leaves the spine. These get treated differently, and the exam is what sorts them out.

True lumbar radiculopathy means a nerve root is being irritated or compressed where it exits the spine, most commonly at L5 or S1.

What it feels like when it is really the nerve root

Nerve root pain has a character that is fairly recognizable once you know what to listen for.

It is often described as electric, burning, or shooting rather than aching. It follows a band or stripe down the leg rather than a diffuse region. It frequently travels below the knee. It may come with numbness, tingling, or weakness in a distribution that matches a specific nerve root — a foot that slaps when you walk, difficulty rising on your toes, a patch of numbness on the top of the foot.

Coughing, sneezing, or straining often makes it worse, because those raise pressure around the nerve root. Sitting is frequently worse than standing.

Pain that stays in the buttock and thigh, aches rather than burns, and has no numbness or weakness is less likely to be nerve root compression, even though patients often call it sciatica.

The things that imitate it

Gluteal tendinopathy and hip pathology refer pain into the lateral thigh and are commonly mistaken for sciatica. Hip arthritis classically refers into the groin, but not always.

Sacroiliac joint dysfunction refers into the buttock and posterior thigh.

Deep gluteal syndrome, including what is loosely called piriformis syndrome, involves irritation of the sciatic nerve after it has left the spine, in the buttock. Same nerve, different location, different treatment.

Peripheral neuropathy can produce numbness and burning in the foot that patients interpret as sciatica, but the pattern is usually both sides and stocking-shaped rather than a stripe down one leg.

Vascular claudication produces leg pain with walking that can resemble the pain of stenosis.

Sorting this out is what the structural exam and, when needed, electrodiagnostic testing are for.

What the imaging will and will not tell you

Here is a fact worth sitting with: disc bulges and herniations are extremely common in people with no symptoms at all. By age 50, the majority of pain-free adults have disc degeneration on MRI, and a substantial fraction have disc bulges. Finding a herniation on your scan does not establish that it is the cause of your pain.

An MRI is useful when the findings match your exam, when we are considering an injection or surgery and need to know exactly where to aim, or when there are red flags. It is not useful as a first step in someone with typical symptoms and no alarming features, and it frequently makes people worse by handing them a frightening vocabulary for a normal aging spine.

EMG and nerve conduction studies answer a different question than imaging. Imaging shows anatomy. Electrodiagnostics show function — whether a nerve root is actually being affected physiologically, which root, how severely, and roughly how long it has been going on. When the MRI shows changes at three levels and the exam is ambiguous, this is what tells us which level actually matters.

The reassuring part

Most lumbar radiculopathy resolves without surgery. The majority of disc herniations shrink on their own over months, and larger herniations often resorb more completely than small ones. Meaningful improvement over six to twelve weeks is the typical course.

That does not mean doing nothing. It means the goal in most cases is to control symptoms and maintain function while the natural history does its work, rather than rushing toward the operating room.

How we approach it

Osteopathic manipulation to address the mechanics around the irritated segment. A lumbar spine that cannot rotate, a pelvis that is rotated, a stiff thoracolumbar junction — these change how much stress lands on the affected level. I am not manipulating the disc. I am reducing the load on it.

Movement and progressive loading. Bed rest makes radiculopathy worse. Early, tolerable movement is better, and building strength once the acute phase settles is what reduces the chance of recurrence. Directional preference — finding the movement that pulls symptoms back toward the spine rather than down the leg — is often useful.

Ultrasound-guided injections when the pain is severe enough to prevent progress. A well-targeted injection that lets you begin moving and loading is doing its job. One given repeatedly to avoid the underlying problem is not.

Electrodiagnostic testing when the diagnosis is unclear, when there is weakness, or when we need to know whether nerve involvement is old or active.

When it is not a wait-and-see problem

Come in urgently, or go to an emergency department, for any of these:

• Loss of bowel or bladder control, or numbness in the saddle region between the legs. This can indicate cauda equina syndrome, which is a surgical emergency.
• Progressive weakness, particularly a foot that is increasingly dropping.
• Severe pain with fever, or a history of cancer, unexplained weight loss, or IV drug use.
• Symptoms in both legs that are getting worse.

Short of those, come in when the pain is not improving after a few weeks, when it is interfering with sleep or work, or when you want to know what is actually driving it rather than guessing.