Does Hip Arthritis Cause Lower Back Pain?

Hip arthritis frequently causes or contributes to lower back pain, and the connection is well documented. In studies of people with symptomatic hip osteoarthritis, roughly three-quarters reported pain that radiated beyond the hip itself into the thigh, knee, lower leg, and low back. The relationship runs through shared anatomy, compensatory movement patterns, and structural changes to the pelvis and spine that hip disease gradually forces on the body. Orthopedic surgeons have a name for this interconnection: hip-spine syndrome.

How Hip Arthritis Changes the Way You Move and Stand

A healthy hip joint allows a wide range of motion, and the pelvis, lumbar spine, and hips work together as a coordinated unit every time you walk, sit, or bend over. When hip arthritis stiffens the joint and makes certain movements painful, the body compensates. You might tilt your pelvis forward or to one side, shorten your stride, or shift your trunk to avoid loading the arthritic hip. These compensations do not just happen during walking. Standing posture changes too.

Research has identified anterior spinal inclination while standing and decreased mobility of the thoracolumbar spine as prognostic factors in hip osteoarthritis, along with increased cumulative hip loading during daily walking.¹ In other words, as hip arthritis progresses, the spine and pelvis gradually reshape their alignment around the failing hip. The lumbar spine may develop an exaggerated inward curve (hyperlordosis) or lose its normal curve entirely, depending on which direction the pelvis tips. Either way, the lumbar discs, facet joints, and surrounding muscles absorb forces they were not designed to carry in that configuration, and back pain follows.

Studies of patients with acetabular dysplasia, a structural hip problem that often leads to arthritis, found that the degree of abnormal hip-socket orientation independently predicted pelvic tilt and lumbar curvature.² The hip shape literally determines the spine shape, and when the hip is damaged, the spine pays the price.

Where the Pain Shows Up and Why It Overlaps

One of the most frustrating aspects of hip-related back pain is that it does not always feel like it is coming from the hip. The hip joint and the lumbar spine share nerve pathways, and pain signals from one region can register in the other. In a study comparing pain patterns in patients with symptomatic hip osteoarthritis and another hip condition called osteonecrosis, 77% of people reported pain in the thigh, knee, lower leg, and low back, not just in the groin or lateral hip where you might expect hip pain to live. Patients with osteoarthritis reported low back pain more frequently than those with the other condition.³

This overlap means a person might visit their doctor primarily complaining of back pain without realizing the hip is involved. The reverse also happens: someone might be told they have a back problem when the hip is driving the symptoms. The diagnostic challenge is especially thorny in older adults, who commonly have imaging evidence of degeneration in both the hip and the spine. Just because an MRI shows a worn disc does not mean the disc is the source of the pain, and just because an X-ray shows hip arthritis does not mean the hip is to blame for every ache in the region.

The Sacroiliac Joint as a Hidden Middleman

Sitting between the hip and the lumbar spine is the sacroiliac (SI) joint, which connects the base of the spine to the pelvis. When hip arthritis limits how much the hip can move, the SI joint absorbs more stress than usual, and this extra load appears to cause the SI joint itself to degenerate. A three-dimensional imaging study of patients with end-stage hip osteoarthritis found evidence that hip stiffness may have driven degeneration in the SI joints. The researchers drew a parallel to hip fusion surgery, which is already known to cause SI joint breakdown, and suggested that the severe motion restriction of advanced hip arthritis has a similar effect.⁴

SI joint pain often feels like deep, one-sided low back pain that can radiate into the buttock or upper thigh. Because it mimics both lumbar disc pain and hip pain, it adds another layer of confusion to an already murky picture. If you have hip arthritis and back pain that does not neatly fit a lumbar spine diagnosis, the SI joint is worth considering as a contributing source.

How Hip Arthritis Triggers Spinal Degeneration Over Time

The link between hip and back is not just about referred pain or sore muscles. Hip arthritis can cause structural changes in the lumbar spine itself. As hip osteoarthritis progresses, the altered pelvic alignment creates conditions that promote degenerative lumbar spondylolisthesis, a condition in which one vertebra slips forward on the one below it. Research has found that the progression of hip osteoarthritis is closely related to the development and progression of this type of spinal slip, mediated through changes in how the pelvis and spine are oriented.⁵

This is an important distinction. Short-term compensations like muscle tightness and altered gait are reversible. But once the lumbar vertebrae start sliding and the discs and facet joints degenerate under abnormal loading, those spinal changes take on a life of their own. The back pain may persist even after the hip is treated. This is one reason surgeons emphasize the value of addressing hip arthritis before it has had years to reshape the spine.

You Do Not Need Full-Blown Arthritis for This to Happen

Hip-spine syndrome does not wait for advanced osteoarthritis to appear. Pre-arthritic hip conditions like femoroacetabular impingement (where the ball and socket pinch against each other) and abnormal femoral torsion (where the thighbone is twisted more than usual) can alter hip and spinopelvic biomechanics enough to cause low back pain on their own.⁶ Among patients undergoing surgery for intra-articular hip disorders without osteoarthritis, including labral tears and impingement, low back pain or posterior pelvic pain was reported in roughly 17% to 38% of patients.³

This matters because many people with these conditions are young adults, sometimes athletes, who would never suspect a hip problem is behind their chronic low back pain. If standard back treatments like core strengthening, epidural injections, or even lumbar surgery have not resolved persistent low back pain, a thorough hip examination may uncover the real driver.

How Doctors Sort Out Whether the Hip or the Spine Is to Blame

When someone has imaging evidence of both hip arthritis and spinal degeneration, figuring out which one is causing the most pain can be genuinely difficult. Physical examination helps: hip arthritis typically limits internal rotation and produces groin pain when the hip is flexed and rotated, while lumbar problems tend to reproduce symptoms with spinal extension or leg-raising tests. But the overlap described above means the exam alone often is not definitive.

One of the most reliable tools in these cases is a diagnostic injection. A local anesthetic and steroid are injected directly into the hip joint under imaging guidance. If the pain goes away, the hip is the primary source. One study found that this approach had a sensitivity of about 92% and a specificity of 100% for predicting whether a patient would benefit from total hip replacement.⁷ In practice, this means that if the injection provides clear relief, you can be very confident the hip is the problem. If it does not help, the pain is more likely coming from the spine or another structure.

The stakes of getting this diagnosis right are significant. Performing a hip replacement on someone whose pain is really coming from the spine leads to a disappointed patient. Performing spinal fusion on someone whose pain is actually hip-driven leads to the same disappointment, plus the added complication that spinal fusion alters pelvic mechanics in ways that make future hip replacement harder.

What Happens to Back Pain After Hip Replacement

Perhaps the strongest evidence that hip arthritis directly causes back pain comes from what happens when you fix the hip. In a study of patients who had documented low back pain before total hip replacement, about 82% had their back pain resolve within one year of surgery, and roughly 91% had resolution by two years.⁸ Their disability scores dropped dramatically, from an average of about 39 out of 100 before surgery to about 17 afterward. The researchers found an interesting detail: patients whose back pain resolved had a larger change in sacral slope between standing and sitting positions compared to those whose pain persisted, suggesting that restoring pelvic mobility was a key factor.

A separate study in patients with severe hip osteoarthritis found that total hip replacement significantly improved low back pain scores, hip pain scores, and quality-of-life measures. Additionally, lumbar scoliosis, an abnormal sideways curvature that had developed as a compensation, significantly decreased after the hip was replaced.⁹ The spine literally straightened out once the hip was no longer forcing it into a crooked position.

These findings are encouraging, but they come with an important caveat. The roughly 9% to 18% of patients whose back pain did not fully resolve after hip replacement likely had independent lumbar pathology that had been accumulating alongside their hip disease, or the structural spinal changes had progressed beyond the point of easy reversal. Timing matters. The longer hip arthritis goes untreated, the more opportunity it has to create self-sustaining spinal problems.

When Prior Spine Surgery Complicates the Picture

The hip-spine relationship creates a particularly challenging clinical scenario for people who have already had lumbar spinal fusion surgery. Fusing lumbar vertebrae together eliminates motion at those segments, which forces the pelvis and hips to absorb more of the movement that the spine can no longer provide. This places extra demands on the hip joints and alters the biomechanics of sitting and bending.

A meta-analysis found that patients with a history of lumbar spinal fusion face roughly double the risk of hip dislocation and more than triple the risk of needing a revision after total hip replacement compared to patients without prior fusion.¹⁰ Patient-reported outcomes were also poorer. The fused spine cannot adjust its pelvic tilt normally when the patient moves between sitting and standing, which places the hip implant at risk of moving out of position.

This creates a dilemma for patients who need both a hip replacement and spinal surgery. The order in which the procedures are performed matters, and surgeons specializing in this area generally prefer to address the hip first when it is clearly the dominant pain generator, partly because hip replacement tends to normalize pelvic alignment and may reduce or resolve back symptoms without spine surgery. But when both problems are severe, collaborative planning between a hip surgeon and a spine surgeon is critical.

Exercise and Physical Therapy for Hip-Related Back Pain

Not everyone with hip arthritis and back pain needs or wants surgery, and conservative management can provide real relief. The logic is straightforward: if limited hip motion is forcing the spine to compensate, improving hip mobility and strengthening the muscles that support both the hip and the pelvis should take some strain off the lower back.

A study of patients with chronic low back pain and lumbar instability found that those who performed targeted hip exercises had significantly greater reductions in pain and disability compared to conventional therapy, with improvements seen as early as three weeks and continuing through six weeks.¹¹ The researchers noted that hip range of motion was significantly more limited in the lumbar instability group to begin with, which supports the idea that tight, stiff hips and back pain are mechanically linked.

Practical exercises that tend to help include hip flexor stretches, hip abductor strengthening (such as side-lying leg raises or clamshells), and gluteal strengthening. Gentle range-of-motion work to maintain whatever hip mobility you still have is also valuable. The goal is not to reverse the arthritis itself but to keep the surrounding muscles strong enough to stabilize the pelvis and reduce the compensatory loading on the spine. Swimming and water-based exercise are especially useful because they allow hip movement without the impact of walking on hard surfaces.

When X-Rays and Symptoms Do Not Match

One complicating factor in all of this is that imaging findings do not always correspond to what a person feels. A nationwide study in Korea found that radiographic hip osteoarthritis was relatively rare in middle-aged and elderly people, and among those who did have it on X-ray, hip pain was infrequent.¹² This discordance works in both directions: some people with obvious hip arthritis on imaging have no pain, while others with minimal imaging changes have significant symptoms.

This discordance is relevant to the back pain question because it means you cannot simply look at a hip X-ray and decide whether the hip is causing back symptoms. A hip that looks moderately arthritic might be completely silent, while one that looks only mildly affected might be producing significant compensatory changes. Clinical correlation, including the physical examination, symptom pattern, and potentially diagnostic injections, matters far more than the X-ray alone.

Central Sensitization and Widespread Pain

There is a neurological dimension to hip-related pain that goes beyond mechanics. In some people with hip osteoarthritis, the nervous system becomes sensitized, meaning it amplifies pain signals and may produce pain in areas that are not structurally damaged. A meta-analysis found that among people with hip osteoarthritis, about 29% had possible neuropathic-like pain and about 9% had probable neuropathic pain based on validated screening tools.¹³

When central sensitization is present, fixing the joint alone may not fully resolve the pain. The nervous system has essentially learned to be hypersensitive, and it may continue broadcasting pain signals from the back, hip, and leg even after the original structural trigger has been addressed. This is one explanation for why a minority of patients continue to have back pain after successful hip replacement. It also explains why some patients describe their pain as burning, tingling, or electric, qualities more typical of nerve pain than mechanical joint pain.

Recognizing central sensitization is important because it changes the treatment approach. These patients often benefit from strategies directed at the nervous system rather than just the joint, including gradual graded exercise, pain neuroscience education, and in some cases medications that target neuropathic pain pathways. If your hip arthritis-related back pain has a burning or shooting quality, or if it seems disproportionate to what your imaging shows, this phenomenon may be part of the picture.

The Sequence That Matters

For people dealing with both hip arthritis and back pain, the practical question often comes down to what to treat first. Surgeons who specialize in hip-spine syndrome generally recommend starting with the structure most likely to be the primary pain generator. Diagnostic injections, as described earlier, are particularly valuable here. If a hip injection provides clear temporary relief of both hip and back symptoms, that is strong evidence to address the hip first.

The rationale for treating the hip first when it appears dominant is supported by the surgical outcome data showing that back pain resolves in the majority of patients after hip replacement. Additionally, treating the hip first avoids the complications that arise when a fused spine distorts pelvic mechanics during subsequent hip surgery. If the back pain persists after the hip is successfully replaced and rehabilitated, it can then be evaluated and treated on its own merits, without the confounding influence of the arthritic hip.

For patients who are not surgical candidates or whose arthritis is not yet severe enough for replacement, the combination of hip-focused physical therapy, activity modification, and occasionally hip injections for flare-ups can provide meaningful improvements in both hip and back symptoms. The key insight is that treating the back alone, without addressing the hip, often produces disappointing results because it treats the symptom while leaving the mechanical cause untouched.