Sciatica or something in the hip, and how to tell them apart

Pain that starts in the low back or the buttock and runs down the leg, past the knee, into the shin or foot, is what most people mean by sciatica. Pain that sits in the groin, the front of the thigh, the outer hip or the buttock and stops around the knee usually comes from the hip or the tissue around it. Where the pain stops is the most useful single clue, and what brings it on is the second. Neither names the problem. Together they narrow the list enough to decide whether you need an examination this week or can wait and see.

Two maps over the same region

Sciatica describes a symptom rather than a condition. The word gets used for any pain that leaves the back and heads south, so plenty of people who describe sciatica have something else. The narrower term is radiculopathy: a nerve root in the lumbar spine is compressed or irritated, and the pain follows that nerve’s territory down the leg.

Nerve roots have territories you can map onto the skin. L4 covers the inner shin and the inside of the ankle. L5 runs down the outer shin, over the top of the foot and into the big toe. S1 takes the back of the calf, the outer edge of the foot and the sole. Pain in one of those bands, with tingling or numbness in the same band, is the classic picture. Weakness can follow: difficulty lifting the foot or the big toe with L5, a calf that will not push you onto your toes with S1.

Coughing, sneezing and straining often make it worse, and so does sitting. Bending forward to put on socks tends to be worse than walking.

What a hip problem looks like

The hip joint refers pain to the groin and the front of the thigh, and sometimes to the knee. That referral is why an older adult with knee pain and no injury needs the hip examined.

Three patterns cover most of it. Groin pain that pinches in a deep squat or when you turn a foot out, with stiffness after sitting, fits the joint itself: osteoarthritis in an older hip, or a labral tear and a shape problem in a younger one. Pain over the bony point on the outside of the hip, worse when you lie on that side, sit cross-legged, or stand with your weight hung on one leg, fits the gluteal tendons. Buttock pain on its own, with nothing below the knee, is often referral from the lower back.

Lateral hip pain is common in women between about 40 and 60 and is often called bursitis, though imaging more often shows changes in the gluteal tendons.

Where the two overlap

An older adult can have both. Hip osteoarthritis and lumbar stenosis are common in the same decade, so one person can carry all three at once.

Spinal stenosis has its own pattern: cramping or heaviness in both legs after a certain distance on foot, relieved by sitting or leaning forward. The leaning-forward relief explains the shopping cart. That pattern changes what a clinician will look at.

Calf pain that arrives at a fixed walking distance and eases when you stand still, in both legs, belongs in a conversation with a clinician.

What you can work out at home

Three observations, none of them diagnostic on their own.

Where the pain goes. Above the knee only points away from a nerve root. Below the knee, in a defined band, points toward one.

What position brings it on. Sitting and bending forward suggest the spine. Walking, standing and lying on the sore side suggest the hip. Deep hip flexion with the knee turned inward, as in a low squat or a low car seat, points at the joint.

A couple of tests. Sit on a chair with both feet on the floor and swivel one foot outward at the hip, as if wiping the floor with the heel. A hip that stops well short of the other side, or pinches in the groin, is worth mentioning. Lie on the sore side for thirty seconds; lateral hip pain that reproduces your familiar ache within that time is a hint. For the nerve, lie on your back and have someone lift the straight leg by the heel. Pain shooting below the knee between roughly 30 and 70 degrees is worth reporting, and it means more when it lands where your usual pain lands.

Single tests in this region are not accurate enough to settle a diagnosis. Studies of straight leg raise and the hip provocation tests find reasonable sensitivity and unremarkable specificity, so a positive result raises a question.

What a clinician does with it

A proper assessment takes about fifteen minutes and involves touching you, which no article can do.

For the nerve, that means testing sensation in each band, strength in the muscles that nerve supplies, and reflexes, then reproducing the pain with a slump or straight leg raise. The pattern across those matters more than any single result.

For the hip, it means measuring how far the hip rotates, comparing sides, and loading the joint in the positions that provoke it. Loss of internal rotation is one of the more reliable signs of hip osteoarthritis.

Imaging comes last and answers less than people expect. Disc bulges are common in people with no leg pain, and labral tears turn up on scans of hips that have never hurt. A scan that finds something does not prove that finding is the source of the pain.

Who should stop sorting and get seen

Most leg pain can wait a week or two for a routine appointment. Some of it cannot.

Go to an emergency department the same day if you have:

• numbness around the saddle area, the inner thighs and buttocks
• new trouble passing urine, emptying your bladder or controlling your bowels
• numbness or weakness in both legs at once
• new loss of sensation or function in the genitals

Those four together are the cauda equina picture, and the window for acting on it is short.

See a clinician within a few days if you have:

• a foot that drags or slaps, or weakness that is getting worse week by week
• fever, chills, or a recent infection alongside back or leg pain
• a history of cancer, unexplained weight loss, or pain that wakes you every night and does not change with position
• groin pain after a fall, or a hip you cannot put weight on
• intravenous drug use or a weakened immune system with new back pain
• pain that came on after a significant accident

An older adult with sudden groin pain and an inability to bear weight needs imaging for a hip fracture, not exercises.

What to do this week

While you wait for an answer, movement that stays inside the pain is reasonable for all three patterns.

If the leg pain follows a nerve, walk in short bouts rather than sitting for long stretches, and change position every half hour. Lying on your side with a pillow between the knees, or on your back with the knees supported, often takes load off. Bed rest beyond a day or two tends to leave the back stiffer and no better. Most disc-related leg pain settles over six to twelve weeks, though the first two can be miserable.

If the pain sits on the outside of the hip, stop hanging on one hip and stop sitting with the legs crossed. Stand side-on to a wall with a pillow between your outer knee and the wall, and press outward into it for 30 to 45 seconds. Avoid stretching the outer hip into adduction; that position tends to aggravate gluteal tendons.

If the groin is sore and the hip stiff, keep the joint moving through what it allows: short walks more often, sit-to-stand from a higher chair, a gentle hip hinge. Strength work for the hip and thigh helps if it starts small.

Nothing in a box settles this

The things sold for sciatica and hip pain mostly address comfort. A shaped cushion or a strap around the thigh can help you sit or sleep in a better position for a few weeks. None of them changes a nerve root or a worn joint.

The cheap and useful items here are a pillow and a chair that lets your feet reach the floor. What I would spend money on before anything electrical is an assessment with someone who can test sensation, strength and hip rotation in person. That is less satisfying than a product and more likely to change the plan.

Common questions

How can I tell if my leg pain is sciatica?

The pattern matters more than the severity. Pain that leaves the back or buttock and runs below the knee in a band, with tingling, numbness or weakness in the same band, fits an irritated nerve root. Pain that stays in the groin, the outer hip or the front of the thigh usually does not.

Can hip arthritis cause pain down the leg?

Yes, usually to the groin, the front of the thigh and sometimes the knee. Pain that reaches the foot is unusual for the hip joint on its own. In an older adult, knee pain with no knee injury is worth a hip examination.

Will an MRI tell me which one it is?

Not on its own. Disc bulges are common in people with no leg pain, and labral tears appear on scans of hips that have never hurt. A scan that finds something does not prove that finding is the source of the pain.

Should I rest until the pain settles?

A day or two of taking it easier is reasonable. Longer bed rest leaves the back and hip stiffer and no less painful. Walking in short bouts and staying inside the range that does not provoke the pain works better for most people.

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