Knee problems can and do cause hip pain, though rarely in the way people expect. The connection is less about one joint “breaking” the other and more about the cascade of compensations your body makes when a knee hurts. When you limp, shift your weight, or unconsciously tighten muscles around a painful knee, the hip on the same side (and sometimes the opposite side) absorbs forces it was never designed to handle long-term. Research has even identified a clinical pattern called “knee-hip-spine syndrome,” recognizing that degeneration in one of these joints tends to travel along the chain.
How a Bad Knee Changes the Way You Move
Your lower body works as a connected chain. Forces generated at the foot travel up through the ankle, knee, and hip, and any disruption at one link forces the others to compensate. A narrative review of kinetic chain biomechanics describes the lumbopelvic-hip complex as the central hub for transferring loads between the trunk and the legs, noting that any blockage or defect in the chain can produce compensatory movement patterns and overuse injuries in other segments.1PubMed Central. Role of kinetic chain in sports performance and injury risk: a narrative review In practical terms, a stiff or painful knee doesn’t just hurt at the knee. It rearranges how force flows through everything above and below it.
One of the clearest demonstrations comes from studies of walking gait. Researchers comparing people with and without knee pain found that those with knee pain walked more slowly, had reduced knee range of motion, and generated significantly less hip extensor force during walking.2Gait & Posture. Comparison of hip and knee muscle moments in subjects with and without knee pain The hip extensors (your glutes, primarily) are critical for propelling you forward and stabilizing your pelvis with every step. When the knee restricts how much it bends, the hip muscles have to work differently, often in less efficient patterns that can lead to fatigue, tightness, and eventually pain at the hip itself.
Increased Loading on the Hip Joint
Beyond changes in muscle effort, knee problems directly increase the mechanical forces pushing through the hip. When you have arthritis in one knee and start favoring it, the loads don’t disappear. They get redistributed to joints that are still functioning normally, and those joints may not be built to handle the extra demand indefinitely.
A study examining people with knee osteoarthritis found that they placed significantly more load on the hip of the same leg, as well as on the opposite hip and knee, during stair climbing compared to healthy controls.3PubMed. The biomechanical fingerprint of hip and knee osteoarthritis patients during activities of daily living Stairs are particularly telling because they amplify the forces at play, but this pattern holds to a lesser degree during flat walking as well. Another study measured the forces more precisely and found that people with knee osteoarthritis had significantly increased adduction moment (a sideways loading force) at both knees and at the opposite hip, along with increased muscle co-contraction throughout both legs.4PubMed. The effect of osteoarthritis of the knee on the biomechanics of other joints in the lower limbs That co-contraction, where muscles on both sides of a joint fire simultaneously for stability, is the body’s attempt to protect the injured knee. But it comes at a cost: the hip absorbs more stress, and the muscles around it fatigue faster.
What makes this insidious is that the person rarely notices the redistribution happening. You don’t consciously decide to load your hip differently. Your nervous system does it automatically, and by the time hip pain shows up, the altered movement pattern may have been running for months or years.
Muscle Imbalances That Bridge the Gap
The muscles around the hip and knee share considerable overlap. The gluteus medius and gluteus maximus stabilize both the pelvis and the knee during single-leg activities like walking, running, and climbing. When one of these muscles underperforms, both joints feel it.
Research on people with patellofemoral pain (a common type of anterior knee pain) has found that they recruit their hip muscles in measurably different patterns compared to pain-free individuals. Specifically, people with patellofemoral pain showed significantly higher activation of the tensor fasciae latae (a smaller hip muscle on the outside of the thigh) and significantly lower activation of the upper gluteus maximus during hip exercises.5PubMed. Persons with patellofemoral pain exhibit altered hip abductor muscle recruitment while performing hip abductor exercises Three of the eleven exercises tested also showed reduced gluteus medius activation in the pain group. This matters because the tensor fasciae latae and the gluteus maximus pull on the hip differently. Over-reliance on the tensor fasciae latae can create tightness along the iliotibial band and irritation at the hip’s lateral aspect, while underuse of the gluteus maximus leaves the hip less stable.
This relationship appears to run in both directions. Weakness of the gluteus maximus and gluteus medius has been linked to increased stress on the patellofemoral joint, potentially impairing hip stability and reducing knee function in runners.6International Journal For Multidisciplinary Research. Correlation between Gluteus Maximus and Gluteus Medius Muscle Strength with Anterior Knee Pain with PFPS for Runners So a person who develops knee pain may end up with hip muscle dysfunction that causes hip pain, and a person who starts with weak hips may develop knee pain that then circles back to worsen the hip. The two joints are effectively in a feedback loop, which is why treating one in isolation often disappoints.
Pelvic Tilt and Its Downstream Effects
The position of your pelvis acts as a bridge between your hip and knee. When knee problems cause you to stand or walk with altered posture, pelvic alignment shifts, and this changes how your hip muscles generate force.
A study examining how pelvic tilt affects hip and knee strength found that hip extensor torque was significantly greater when the pelvis was tilted forward (anterior tilt) compared to neutral or backward-tilted positions. However, this change did not extend to hip flexors, knee flexors, or knee extensors.7Journal of Functional Morphology and Kinesiology. Does Pelvic Tilt Angle Influence the Isokinetic Strength of the Hip and Knee Flexors and Extensors? The hip flexor-to-extensor torque ratio also shifted with pelvic tilt, meaning the muscles around the hip were working in a different balance depending on posture. People with chronic knee pain often adopt subtle postural changes, and even a modest shift in pelvic tilt can alter the demands placed on hip muscles day after day.
Knee-Hip-Spine Syndrome
Clinicians have noticed for decades that patients rarely present with degeneration in just one lower-body joint. The spine, hip, and knee are anatomically connected, and degenerative changes in one structure frequently accompany pain and dysfunction in the others. This observation has been formalized as “knee-hip-spine syndrome.”8PubMed Central. Knee-Hip-Spine Syndrome: Improvement in Preoperative Abnormal Posture following Total Knee Arthroplasty
A long-term study tracking osteoarthritis progression found that worsening knee osteoarthritis was associated with progressive osteoarthritis in the hip and lumbar spine.9PubMed Central. The relation between progressive osteoarthritis of the knee and long term progression of osteoarthritis of the hand, hip, and lumbar spine This doesn’t necessarily mean knee arthritis directly caused hip arthritis in every case. Some people may have a systemic tendency toward cartilage breakdown that hits multiple joints. But the mechanical explanation also holds weight: years of altered gait and compensatory loading driven by a painful knee can accelerate wear in a hip that might otherwise have lasted much longer. Both mechanisms probably operate simultaneously in most patients, which is why the syndrome is so common.
For the individual dealing with a progressively bad knee, the practical message is worth emphasizing: hip pain that develops gradually alongside or after knee problems is not a coincidence and should not be dismissed as “just getting older.”
When the Direction Reverses
One of the trickiest aspects of the hip-knee relationship is that the pain sometimes travels in the opposite direction from what you’d guess. Hip arthritis is notorious for referring pain to the knee, sometimes so convincingly that the knee gets treated while the hip goes undiagnosed. Case reports in the orthopedic literature describe patients who underwent extensive knee workups before someone thought to image the hip and found significant arthritis there.10PubMed Central. Don’t forget the hip! Hip arthritis masquerading as knee pain
This referred pain pattern exists because the hip and knee share overlapping nerve supplies, particularly branches of the obturator and femoral nerves. A diseased hip joint can generate pain signals that the brain interprets as coming from the knee region, especially the front or inner thigh. If you have knee pain that doesn’t match your knee imaging findings or doesn’t respond to knee-specific treatment, the hip should be on the list of suspects.
When the source of pain is genuinely ambiguous, a diagnostic injection of anesthetic into the hip joint can help sort things out. One study evaluating this technique found that relief following hip injection had over 90% sensitivity and 100% specificity for predicting that the hip was the pain source.11PubMed. Accuracy of diagnostic injection in differentiating source of atypical hip pain If the injection quiets the pain, the hip was driving the symptoms. If it doesn’t, the source is elsewhere.
Balance Problems Add Another Layer
Knee osteoarthritis doesn’t just change how much force goes through the hip. It also degrades your sense of where your joints are in space, a capacity called proprioception, and this creates instability that ripples upward.
A study comparing people with bilateral knee osteoarthritis to healthy controls found that the osteoarthritis group had significantly slower reaction times during balance testing, reduced maximum weight-shift distance, and poorer directional control. Joint position errors at the knee were moderately to strongly correlated with all of these balance measures.12PubMed Central. Investigating Knee Joint Proprioception and Its Impact on Limits of Stability Using Dynamic Posturography in Individuals with Bilateral Knee Osteoarthritis When your brain can’t accurately sense your knee position, it compensates by stiffening the hip and trunk for stability. That sustained stiffness loads the hip joint and fatigues the surrounding muscles, creating another pathway to hip discomfort.
This is especially relevant for older adults, who may already have age-related declines in proprioception. A bad knee accelerates the process, and the resulting instability contributes to both hip pain and fall risk. Balance training specifically targeting proprioception, not just strength, becomes important in this population.
Why Treating Both Joints Produces Better Results
Given how tightly the hip and knee interact, it makes sense that rehabilitation programs targeting both joints outperform those focused on the knee alone. A systematic review and meta-analysis of exercise programs for patellofemoral pain found that combined hip-and-knee exercise programs delivered the greatest pain relief and functional improvement. Programs targeting only the knee were consistently inferior to those that included hip work.13PubMed Central. Trunk, Hip and Knee Exercise Programs for Pain Relief, Functional Performance and Muscle Strength in Patellofemoral Pain: Systematic Review and Meta-Analysis Interestingly, hip-only programs performed comparably to combined programs, suggesting that addressing hip muscle function may be the more critical ingredient even when the primary complaint is at the knee.
For knee osteoarthritis specifically, hip abductor strengthening exercises have shown a significant effect on reducing knee pain.14Media Keperawatan Indonesia. Reduction of pain in patients with knee osteoarthritis by using hip abductor strengthening exercise Strengthening the hip abductors (primarily gluteus medius) helps control how the pelvis and femur move during walking, reducing the abnormal sideways loading at the knee that drives pain. This is a clear example of the kinetic chain working in the patient’s favor: improving one link benefits the others.
For someone dealing with both knee and hip symptoms, a practical starting point includes exercises like side-lying hip abduction, clamshells, and single-leg balance work. These build gluteal strength and hip stability without putting heavy demands on a painful knee. As strength improves, activities like step-ups and partial squats can be added. The key is that hip exercises need to be part of the program from the start, not added as an afterthought once knee pain persists.
What About Orthotics and Footwear?
Since the kinetic chain starts at the ground, it’s natural to wonder whether shoe inserts or orthotics designed for knee pain might inadvertently harm the hip. Lateral wedge orthotics, which tilt the foot slightly outward to reduce loading on the inner knee compartment, are commonly prescribed for medial knee osteoarthritis. A three-year follow-up study specifically examined whether these orthotics caused structural changes at the hip or ankle and found no significant differences in joint space narrowing at either the hip or ankle between people using wedged versus neutral insoles.15PubMed Central. Long-term effects of lateral wedge orthotics on hip and ankle joint space widths The wedged insoles did, however, slow joint space narrowing at the medial knee, which was their intended purpose.
This is reassuring for people already using these devices. It also highlights that corrections at the foot can influence forces throughout the leg. Poorly fitting footwear or worn-out shoes can amplify the mechanical problems caused by a bad knee, while appropriate support can modestly reduce them. If you’re dealing with knee and hip symptoms, having your footwear and gait evaluated by a physical therapist or podiatrist is worth the visit.
When to Suspect the Hip Is Becoming a Separate Problem
There’s a difference between hip pain driven by knee-related compensation and hip pain from a hip joint that has developed its own pathology. Knowing when the hip has crossed from “irritated by overwork” to “structurally damaged” matters because the treatment approach changes. Compensatory hip pain usually improves as the knee is treated and movement patterns normalize. A hip that has developed its own arthritis or labral tear requires direct treatment.
Signs that the hip may have become a standalone problem include groin pain (the hallmark location of true hip joint pathology), pain that worsens with hip-specific motions like internal rotation or deep flexion, catching or clicking in the hip, and pain that persists even when the knee improves or after knee replacement surgery. Pain along the outside of the hip is more often muscular (bursitis or gluteal tendon irritation from altered mechanics) and generally responds well to targeted strengthening.
For people who have lived with knee problems for years, getting a hip exam as part of routine follow-up is sensible even in the absence of hip symptoms. The biomechanical evidence makes clear that the hip is working harder than normal, and catching early changes before they become entrenched gives you more treatment options. If you’re headed toward knee replacement, ask your surgeon about a hip screening as well. The interconnected nature of these joints means that overlooking one while repairing the other can leave you with incomplete relief.