Uneven hips are extremely common. About 90% of people have some degree of leg length difference, and most of those differences are under 1 cm. That alone can make one hip sit slightly higher than the other. But leg length isn’t the only explanation. Muscle imbalances, joint tightness, spinal curvature, and even hormonal changes after pregnancy can all shift your pelvis out of alignment. The key distinction is whether something structural is going on or whether your soft tissues are pulling things off-center.
Structural vs. Functional Causes
There are two broad categories behind uneven hips, and they behave very differently. A structural (or “true”) leg length discrepancy means the bones themselves are different lengths. This can come from genetics, a childhood fracture, growth plate injury, or degenerative joint conditions that wear down cartilage unevenly over time. If one femur or tibia is physically shorter, your pelvis will tilt to compensate every time you stand.
A functional discrepancy, on the other hand, involves no actual bone length difference. Instead, something in the soft tissue is creating the illusion of unevenness. Tight hip flexors on one side, a joint contracture at the knee, excessive ankle pronation (flat foot), or weak gluteal muscles can all rotate or tilt the pelvis enough to make your hips look and feel uneven. Ligament laxity and muscle imbalances are the most frequent culprits here, and they’re also the most treatable.
The distinction matters because X-rays can confirm a structural difference but won’t reveal a functional one. Functional problems only show up during movement or weight-bearing assessments, which is why a physical exam that watches how you stand, walk, and bend is just as important as imaging.
Scoliosis and Spinal Curvature
A lateral curve in the spine can tilt the entire pelvis to one side. Scoliosis is one of the more common structural reasons for visibly uneven hips, particularly when the curve sits in the lower (lumbar) spine. Curves under 20 degrees are typically monitored without intervention. Curves between 20 and 30 degrees often warrant bracing, especially in adolescents who are still growing. Once a curve exceeds 40 degrees, the likelihood of eventually needing surgical correction is high.
Not all scoliosis is obvious. Mild curves can go undetected for years, with the only visible sign being one hip or shoulder that sits slightly higher than the other. If you notice your waistline looks asymmetrical or your pants always seem to hang unevenly, a spinal curve is worth investigating.
Pregnancy and Postpartum Changes
Pregnancy is a surprisingly common trigger for pelvic asymmetry. During pregnancy, the body produces elevated levels of a hormone called relaxin, which loosens ligaments throughout the pelvis to prepare for delivery. That loosening widens the hips and increases the range of motion in the pelvic joints, but it also makes those joints less stable and more vulnerable to shifting out of alignment.
Relaxin levels don’t snap back to normal after birth. They can take up to 12 months to return to pre-pregnancy levels, and during that window the pelvis remains susceptible to asymmetric alignment. Research from Virginia Tech found that even at three to five months postpartum, pelvic asymmetry may still be present due to lingering relaxin. If the tissues around the pelvis adapt to a shifted position during this period (through changes in muscle mass and bone loading), the unevenness can persist longer. This is one reason postpartum low back and hip pain is so common, and why targeted rehab matters during that first year.
How Uneven Hips Affect Your Body
Your body is a connected chain. When the pelvis tilts, everything above and below it compensates. With every step, a misaligned pelvis distributes your weight unevenly, loading one leg more than the other. Over time, that asymmetric loading puts extra pressure on the hip, knee, and ankle of the overworked side, potentially accelerating cartilage breakdown and increasing the risk of osteoarthritis.
The compensations can show up in unexpected places. IT band syndrome, piriformis syndrome (which mimics sciatica), and even plantar fasciitis in the foot can all trace back to a pelvic tilt. A lateral tilt tends to create a “rolling” gait as your body shifts side to side for balance. An anterior (forward) tilt shortens your stride by limiting how far your leg can extend behind you, which reduces the power your glute muscles can generate. Over months or years, the repetitive strain from these altered movement patterns can cause pain that seems unrelated to the hips.
A Simple Test You Can Do at Home
The Trendelenburg test gives you a rough sense of whether one hip is weaker than the other. Stand in front of a mirror and lift one foot off the ground by bending that knee and hip to about 30 degrees. Hold for 30 seconds. Watch what happens to the pelvis on the side of the lifted leg.
If your hip muscles are working properly, the pelvis on the lifted side should stay level or rise slightly. If the pelvis drops on the side of the lifted leg, that’s a positive Trendelenburg sign, meaning the standing leg’s hip muscles (particularly the gluteus medius) aren’t strong enough to keep the pelvis stable. Repeat on the other side. A clear difference between the two sides suggests a muscular imbalance that could be contributing to your uneven hips.
This test won’t tell you everything. It identifies weakness but can’t distinguish between a structural bone length issue and a soft tissue problem. Still, it’s a useful starting point before seeking professional evaluation.
When Imaging Helps
If a clinician suspects a true structural difference, a standing X-ray of both legs is the standard approach. Radiologists measure from the top of each femoral head (the ball of the hip joint) down to the ankle joint on each side, then compare the totals. They can also measure the femur and tibia separately to pinpoint exactly where the discrepancy originates. This is the most accurate way to confirm whether a bone length difference exists and how large it is.
For differences under 1 cm, imaging often just confirms what’s already suspected: a minor, common variation that may not need intervention. For differences over 2 cm, which affect roughly 0.1% of the population, imaging becomes essential for planning treatment.
Corrective Exercises and Stretches
For functional pelvic tilts caused by muscle imbalance or tightness, a combination of stretching and strengthening is the standard approach. Research suggests that hip stretches can produce noticeable changes in pelvic position almost immediately, while more lasting correction typically takes around 8 weeks of consistent work.
The most effective exercises target the muscles that directly control pelvic position:
- Hip flexor stretches lengthen the muscles at the front of the hip that, when tight, pull the pelvis into a forward tilt. A deep lunge with the back knee on the ground is the classic version.
- Glute bridges strengthen the gluteal muscles that stabilize the pelvis from behind. Lying on your back with knees bent, lift your hips toward the ceiling and hold briefly at the top.
- Single-leg exercises like step-ups or single-leg squats force each side to work independently, which helps correct side-to-side imbalances rather than letting your stronger side compensate.
- Posterior pelvic tilts teach you to actively control pelvic position. Lying on your back, flatten your lower back into the floor by gently engaging your abdominals and tucking your pelvis.
The goal isn’t just flexibility or strength in isolation. It’s retraining the muscles around the pelvis to hold it in a more neutral, symmetrical position during everyday movement. A physical therapist can identify which specific muscles are tight or weak on each side and build a program around your particular pattern of imbalance.
Heel Lifts and Orthotics
For confirmed structural leg length differences, a heel lift is often the simplest fix. These are wedge-shaped inserts placed inside the shoe of the shorter leg to level out the pelvis. Most practitioners cap in-shoe lifts at about 6 mm (roughly a quarter inch) because anything thicker tends to cause the heel to slip out of the shoe. If more correction is needed, the additional height gets built directly onto the shoe’s sole.
Heel lifts work well for small-to-moderate structural discrepancies, but they don’t address functional causes. If your hips are uneven because of muscle tightness or weakness rather than bone length, adding a lift can actually make the problem worse by reinforcing the compensatory pattern your body has already adopted. Getting the right diagnosis first is what makes the difference between a helpful intervention and a counterproductive one.