A bad hip can absolutely cause leg pain, and it does so more often than most people realize. Nearly half of patients with hip osteoarthritis experience pain below the knee, a fact that surprises even many medical professionals. The pain travels down the leg because the same nerves that supply the hip joint also send branches to the thigh, knee, and inner lower leg.
Why Hip Problems Cause Pain Elsewhere
The hip joint is supplied by two major nerves: the femoral nerve and the obturator nerve, both originating from the second through fourth lumbar nerve roots in your lower spine. These nerves don’t just serve the hip. They send branches across a wide territory that includes your groin, the front and inner thigh, the knee, and in the case of the femoral nerve’s saphenous branch, the inner lower leg all the way to the ankle.
When something goes wrong inside the hip joint, the irritated nerve signals can be “felt” anywhere along this shared pathway. This is called referred pain. Your brain receives distress signals through the femoral or obturator nerve and interprets them as coming from the thigh or knee rather than the hip itself. Anatomical studies on cadavers have confirmed the physical wiring behind this: both nerves send small branches that connect the hip joint capsule directly to the skin around the knee and the kneecap area. A small percentage of nerve cells even have fibers that split and run to both the hip joint and the knee skin simultaneously, which helps explain why the brain can confuse the two locations.
The result is that many people with a deteriorating hip show up at a doctor’s office complaining of knee pain, thigh aches, or vague leg discomfort, never suspecting their hip is the source.
Where You Feel Pain Depends on the Hip Problem
Different hip conditions tend to produce pain in different areas of the leg.
Hip osteoarthritis is the most common culprit. Groin pain is the hallmark, present in roughly 84% of cases, but the pain frequently radiates down the front or inner thigh and into the knee along the path of the saphenous nerve. That below-the-knee pain shows up in about 47% of hip arthritis patients. Many people describe it as a deep ache in the knee or inner shin that worsens with walking or standing.
Greater trochanteric pain syndrome (often called hip bursitis) creates a different pattern. The pain sits on the outer hip, right over the bony prominence you can feel on the side of your upper thigh. From there it often radiates down the outer thigh and sometimes into the back of the leg. People with this condition commonly notice it gets worse when lying on the affected side at night or when crossing their legs. The pain tends to flare when you bring your leg inward across your body and ease when you spread it outward.
Hip labral tears, which involve damage to the ring of cartilage lining the hip socket, can cause pain in the groin, lower back, or leg. The groin is the most typical location, but some people feel catching or clicking sensations in the hip along with aching that extends into the thigh.
Hip Pain vs. Spinal Pain in the Leg
Hip-related leg pain is easy to confuse with sciatica or other spine problems, and the two can even coexist in what’s sometimes called hip-spine syndrome. Knowing the differences helps you communicate clearly with your doctor and get to the right diagnosis faster.
Hip-origin leg pain typically follows the front or inner thigh down toward the knee and inner lower leg. It tends to worsen with weight-bearing activities like walking, climbing stairs, or getting in and out of a car. The pain is usually a deep ache rather than a sharp, electric sensation, and it often comes with stiffness in the hip, reduced range of motion, or a limp.
Spine-origin leg pain, by contrast, often shoots down the back or outer side of the leg, sometimes all the way to the foot. It’s more likely to come with numbness, tingling, or actual muscle weakness. People with lumbar spinal stenosis, for instance, often feel their legs go weak or numb after walking a certain distance, then recover after sitting down. That pattern is uncommon with hip problems alone.
The overlap can be tricky. Some people have arthritis in both the hip and the lower spine, and each condition feeds into the other. If hip pain changes your gait, the altered mechanics can stress your spine. If spinal nerve compression weakens your hip muscles, your hip joint takes more punishment. A thorough physical exam that tests hip range of motion separately from spinal flexibility is the best starting point for sorting out which structure is driving the pain.
How the Hip Is Evaluated
When a doctor suspects the hip is causing your leg pain, they’ll typically start with specific movement tests. Two of the most widely used are the FADIR and FABER tests. During FADIR, your doctor bends your hip up, angles the knee inward, and rotates the leg. Pain in the front of the hip during this maneuver is a strong signal of something going on inside the joint, such as a labral tear or impingement. The FABER test positions the leg in a “figure four” shape and can help rule in or rule out both hip joint and sacroiliac problems.
Imaging usually follows if the physical exam points to the hip. Standard X-rays can reveal arthritis and bone spur formation. MRI provides a detailed look at the labrum, cartilage, and surrounding soft tissues when the X-ray looks normal but symptoms persist. In some cases, a diagnostic injection of numbing medication into the hip joint settles the question: if the leg pain disappears after the hip is numbed, the hip was the source.
Managing Leg Pain From a Bad Hip
The most effective conservative treatment for hip-related leg pain is physical therapy focused on strengthening the muscles around the hip and restoring flexibility. A typical rehabilitation program moves through distinct phases. The early phase focuses on calming inflammation and preventing stiffness with gentle stretches for the hip flexors, hamstrings, and inner thigh, along with low-resistance cycling and basic core exercises like bridges and planks. The goal is to get through daily activities with minimal pain before adding intensity.
Once low-impact activities feel comfortable, the program progresses to strengthening exercises like clamshells, side leg raises, side stepping, lunges, and single-leg balance work. These exercises target the muscles that stabilize the hip during walking and stairs, which takes pressure off the joint itself and often reduces the referred pain down the leg. A common milestone at this stage is being able to walk two miles with no pain and a normal stride.
The final phase involves sport-specific or higher-demand activities and a gradual return to running if that’s your goal. Progression through these phases varies widely from person to person. Setbacks are normal, and pushing through pain during rehab tends to create more problems than it solves. If an exercise causes pain, stopping and waiting a few days before trying again is the standard advice.
For hip osteoarthritis that doesn’t respond to physical therapy and activity modification, joint replacement remains one of the most reliable surgical procedures in medicine. Many people who had been attributing their knee or leg pain to “bad knees” or aging find that their leg pain resolves completely after a hip replacement, confirming the hip was the true source all along.