Can Hip Problems Cause Leg Weakness?

Hip problems can absolutely cause leg weakness, and they do so more often than most people realize. The connection is not just about pain making you reluctant to use the leg. Damaged, inflamed, or arthritic hip joints trigger genuine neurological and muscular changes that reduce the force your leg muscles can produce, sometimes by a quarter or more compared to a healthy side. The mechanisms range from reflexive muscle shutdown caused by joint swelling to nerve compression deep in the buttock, and teasing apart what is actually causing the weakness matters a great deal for treatment.

How a Hip Joint Can Shut Down Its Own Muscles

One of the least intuitive pathways is something called arthrogenic muscle inhibition. When a hip joint is swollen, injured, or inflamed, the nervous system can reflexively dial down activation of the muscles around it. Research has shown that simply injecting extra fluid into a healthy hip joint reduces activation of the gluteus maximus on that same side during tasks like hip extension, while the opposite leg stays unaffected.¹ This is not a conscious decision to guard the joint. It is the nervous system pulling the handbrake on nearby muscles before you even feel pain.

In people who have lived with chronic hip pain for months, the picture gets murkier because several things pile up at once. Disuse atrophy sets in when you move less. The muscles themselves may physically shrink. Pain during exertion reduces the effort you put into a movement. And the inhibition reflex from joint inflammation or excess fluid persists underneath all of that.² What the person experiences is a leg that feels weak and unreliable, but multiple overlapping causes are responsible.

Osteoarthritis and the Muscles It Hollows Out

Hip osteoarthritis deserves its own discussion because it is the single most common hip problem that leads to measurable leg weakness. A study comparing people with even mild-to-moderate hip osteoarthritis against healthy controls found that hip and knee muscle strength was on average 22 to 26 percent lower in the osteoarthritis group. Muscle volume losses were widespread too, ranging from about 5 to 30 percent across different muscle groups including the quadriceps, hamstrings, adductors, gluteus maximus, and gluteus minimus.³ The weakness was bilateral, meaning both legs were affected even though the arthritis was on one side. That surprised researchers and suggests the problem is not purely about favoring the painful hip.

What makes this especially relevant is that the weakness extends well beyond the hip muscles themselves. The quadriceps, which straighten your knee and are critical for climbing stairs, getting out of a chair, and catching yourself when you stumble, are significantly weaker in people with hip osteoarthritis. Research has found that people with hip osteoarthritis have reduced voluntary activation of the quadriceps, meaning the brain’s ability to fully recruit those muscle fibers is impaired.⁴ This is a central nervous system change, not just a local muscle problem. The brain itself is sending weaker “contract” signals to the thigh.

Labral Tears and Impingement

You do not need full-blown arthritis for hip problems to weaken your leg. Femoroacetabular impingement, where the bones of the hip joint do not fit together smoothly, and labral tears, where the cartilage ring lining the hip socket is damaged, both produce measurable strength losses. In a study of patients with symptomatic impingement and labral tears, about 46 percent had hip abduction strength deficits and 42 percent had hip flexion deficits. The involved hip showed roughly an 8 to 9 percent drop in strength compared to the other side.⁵ Patients whose hip flexor strength was more compromised also tended to have larger labral tears and worse functional scores.

Interestingly, the flexor weakness in labral tear patients does not appear to come from the muscles physically shrinking. One study found that hip flexor strength was significantly decreased compared to controls, but muscle size and the pattern of which muscles fired first were the same.⁶ That points back to the inhibition mechanism: the muscle is there, it is the right size, but the nervous system is not letting it work at full capacity. For younger, active people dealing with groin or hip pain and noticing their leg feels oddly weak, a labral tear or impingement is worth investigating.

Nerve Compression Around the Hip

The hip region is a busy intersection for major nerves, and problems in the area can compress them directly. The most familiar example is piriformis syndrome, where the piriformis muscle deep in the buttock squeezes the sciatic nerve. A case report described a young woman whose primary complaint was bilateral leg weakness rather than the classic sciatic pain. Electromyography confirmed sciatic nerve damage on both sides, and imaging showed the piriformis muscles were physically trapping the nerves.⁷ This is relatively uncommon, but it illustrates that nerve entrapment near the hip can present as leg weakness without the textbook shooting pain down the back of the leg.

The femoral nerve, which runs along the front of the hip and controls the quadriceps, is also vulnerable. This is particularly relevant after hip replacement surgery, where the nerve can be stretched or compressed during the procedure. One large review found femoral nerve palsy occurred in about 0.2 percent of total hip replacements overall, but the rate jumped more than 14-fold with certain surgical approaches that access the hip from the front.⁸ Recovery was slow: meaningful improvement did not begin for most patients until more than six months after surgery, and motor weakness had resolved in about three-quarters of patients by roughly 33 months. The remaining patients were left with mild residual weakness.

When It Looks Like the Hip but It Is the Spine (or Both)

One of the trickiest diagnostic puzzles involves telling hip-origin leg weakness apart from spine-origin leg weakness. Lumbar spinal stenosis and disc herniations can compress nerve roots and cause weakness in the exact same muscles that hip problems affect. To make things harder, a degenerated hip joint can send pain all the way down to the lower leg, mimicking the pattern of a pinched nerve in the spine.⁹ When someone has both a bad hip and a narrowed spinal canal, figuring out which one is actually causing the leg symptoms can require diagnostic injections and careful nerve testing.

Clinicians call this overlap “hip-spine syndrome.” The concern is that treating one problem while missing the other leaves the patient still struggling. A patient might undergo hip replacement expecting the leg weakness to resolve, only to find it persists because the real culprit was a compressed nerve root in the lower back. Evaluation should include careful assessment of the spinal nerves whenever someone with hip arthritis has leg weakness, particularly when the weakness follows a pattern along one nerve’s territory.¹⁰

Musculoskeletal conditions around the hip can also mimic the physical exam findings of a spinal nerve problem, including weakness in specific muscle groups. Distinguishing between the two often requires looking at the full picture: does the weakness follow a clean nerve root pattern, or is it more diffuse? Is there numbness in a stripe down the leg, or more of a general achiness? A systematic physical examination and, when needed, electrodiagnostic testing can sort out these overlapping presentations.¹¹

The Fall Risk Connection

Hip-related leg weakness is not just an inconvenience or a functional annoyance. It has real consequences for staying on your feet, especially as you age. The hip abductors, the muscles on the outer side of the hip that keep your pelvis level when you stand on one leg, turn out to be a strong predictor of injurious falls. A study found that each unit increase in hip abductor strength per kilogram of body weight reduced the risk of falls causing injury by about 16.5 percent. Hip abductor strength also mediated nearly a quarter of the relationship between balance confidence and fall risk, meaning part of the reason confident people fall less is that they tend to have stronger hip abductors.¹²

The biomechanics of how this plays out during walking have been studied directly. When hip abductor muscles are fatigued, older adults show larger side-to-side displacement when bumped or pulled off balance, requiring significantly bigger stability corrections to recover. One study measured a 14 percent increase in lateral displacement and an 11 percent larger recovery effort after hip abductor fatigue.¹³ Fatigued hip abductors also increased stride variability and asymmetry, both of which are red flags for fall risk.¹⁴ For someone whose hip abductors are chronically weakened by arthritis or tendon disease rather than just temporarily fatigued, these instabilities are present every time they walk.

Gluteal Tendinopathy and the Lateral Hip

Gluteal tendinopathy, often felt as pain on the outer side of the hip and sometimes called “greater trochanteric pain syndrome,” deserves mention because it affects the very muscles most important for lateral stability. People with this condition walk differently: they show greater hip adduction moments throughout the stance phase of walking, meaning the hip is being pulled inward more forcefully with each step. They also demonstrate more pelvic drop on the opposite side and greater trunk lean to compensate.¹⁵ The characteristic waddle or hip-hitch that people with lateral hip pain develop is the body’s workaround for abductor weakness, and it places extra load on the knee and ankle below.

Weakness After Hip Surgery

Hip replacement surgery is performed to fix hip problems, but the surgery itself can introduce new sources of leg weakness, at least temporarily. A systematic review of nerve injuries after total hip arthroplasty found that most injuries presented immediately after surgery and were related to nerve traction, limb lengthening, or retractor pressure during the procedure. The femoral nerve, sciatic nerve, and superior gluteal nerve were all affected, with consequences ranging from severe motor weakness to milder abductor impairment.¹⁶

Even without outright nerve injury, the muscles around the hip remain abnormal for a surprisingly long time after replacement. Postoperative electromyography studies have consistently revealed altered activation patterns, including delayed gluteus medius activity and excessive recruitment of muscles in the back of the leg to compensate. These abnormalities persisted for up to 12 months in many patients and, in isolated cases, beyond a decade.¹⁷ This helps explain why some people feel like their operated leg never quite works the same way, even after the pain is gone. The muscles are firing, but in the wrong sequence and with the wrong intensity.

When the Hip Joint Itself Collapses

At the severe end of the spectrum, conditions that destroy the structural integrity of the hip joint produce dramatic leg weakness and disability. Avascular necrosis, where the blood supply to the femoral head is disrupted and the bone literally dies and distorts, can result in severe pain, limping, and significant deformity. A case report described a young woman with stage-4 avascular necrosis following a joint infection who presented with a 40-degree adduction deformity and 5 centimeters of true leg shortening.¹⁸ In these cases, the mechanical architecture of the hip is so compromised that the muscles have no stable platform to pull against, making the entire leg functionally weak regardless of muscle health.

Rebuilding Strength Through Rehabilitation

The encouraging news is that hip-related leg weakness responds to targeted exercise, even in scenarios that sound discouraging. After hip fracture, a randomized controlled study found that a home-based leg-strengthening program produced large improvements in muscle force production, walking speed, and overall physical function a full year after the fracture. The strength gains had a large effect size, and meaningfully more patients in the exercise group achieved clinically important improvements in walking ability compared to controls who received standard care.¹⁹

After hip replacement, early and progressive strength training makes a measurable difference. A study that started maximal strength training of the operated leg just one week after surgery, using leg press and hip abduction exercises five times a week for four weeks alongside conventional rehab, found significantly greater strength recovery compared to standard rehabilitation alone.²⁰ This runs counter to the instinct many people have to rest and protect the leg for as long as possible after surgery. Supervised, progressive loading appears to be both safe and superior to a cautious approach.

For longer-term recovery, extended outpatient programs that progress from flexibility and balance work into true resistance training have shown benefits. A structured program that began with coordination and balance exercises in the first three months and then added progressive resistance training in a second phase targeted the specific deficits common in hip patients: tight hip flexors and extensors, weak abductors, and impaired weight shifting.²¹ The common thread across all of these rehabilitation approaches is that the weakness, while real and sometimes severe, is not permanent. Muscles that have been inhibited, atrophied, or under-recruited can be coaxed back to function with the right kind of progressive challenge.

Signs That Leg Weakness May Be Coming from Your Hip

Not all leg weakness traces back to the hip, of course. But certain patterns raise that possibility. Weakness that is most pronounced when you try to lift your leg to the side, climb stairs, or rise from a low seat points toward hip abductor or flexor involvement. A feeling that the leg “gives way” during walking, especially when your weight is fully on that leg, is characteristic of hip abductor failure. Groin pain that worsens with activity and coincides with the weakness is a classic hip joint pattern, while pain and weakness that radiate in a narrow stripe down the back or front of the leg are more suggestive of nerve involvement, whether from the hip or the spine.

If you have been told you have a hip problem and you notice your thigh muscles on that side are visibly smaller than the other, that is not your imagination and it is not trivial. The bilateral strength and volume losses documented in hip osteoarthritis research suggest that even mild hip joint disease can silently erode the muscles you depend on for everyday activities. Bringing this up with a clinician early, rather than waiting until the weakness becomes obvious during a fall or a stumble, gives you the best shot at reversing it with targeted strengthening before it compounds into a larger mobility problem.