One Leg Is Longer Than the Other? A Chiropractor Explains

Why Is One Leg Longer Than the Other?

According to Dr. Austin Warden, D.C., a functional leg length discrepancy occurs when misalignments in your pelvis, hip, knee, or ankle cause one leg to appear longer than the other. ¹ While anatomical differences in bone length can occasionally happen, most cases are functional—meaning they are the result of imbalanced movement patterns, poor posture, and chronically tight muscles that pull your skeletal system out of alignment.

Have you ever noticed that the bottom hem of one pant leg is worn and frayed while the other stays perfectly intact? Or that the sole of your right shoe is always wearing out faster than the left? You may have concluded that one leg is longer than the other. Healthcare providers call this leg length discrepancy (LLD), and you’re not alone—about 40–70% of the population has it to some degree. ¹

Is it noticeable to others? To what degree is one leg longer than the other? Length differences can range from a fraction of an inch to several inches, but people won’t usually notice until the condition causes you to limp. The more discrepancy you have, the more likely you are to experience issues with pain, poor posture, and an unbalanced gait.

Why One Leg is Longer Than the Other (Or Looks That Way)

In some cases, leg length discrepancy is anatomical—the bones of the lower leg (the tibia and femur) have measurably different lengths due to a birth defect, bone or growth plate injury, or joint replacement surgery. However, most leg length discrepancy is functional—it’s a result of how you’re using your body.

Our most overused muscles tend to become chronically tight because we adopt an imbalanced movement pattern that weakens them, causing poor joint mechanics, abnormal spine curvature (like scoliosis), and misalignment. This can put quite a damper on our lifestyle and wellness goals.

Your musculoskeletal system is like a connected pulley network. When one part shifts out of alignment, the rest of your body adjusts to balance you out. Leaning constantly on one hip, for example, shifts other body parts and joints out of alignment.

“Your body is incredibly adaptive. When your pelvis or hips shift out of alignment from repetitive strain or poor posture, your muscles tighten up to compensate and keep you balanced. Over time, this functional shift makes one leg seem longer than the other, creating a chain reaction of wear and tear throughout your entire body.” — Dr. Austin Warden, D.C.

Although our bones are usually equal in length, functional leg length discrepancy causes one leg to appear longer when really, it’s just a misalignment in your pelvis, hip, knee, ankle, or foot.

Symptoms You May Experience If One Leg is Longer Than the Other

If your leg length discrepancy is minuscule, you may not feel any symptoms. However, clinical studies show that even a small difference can force your pelvis to compensate for postural imbalance. ² Because it forces you to work harder to maintain your balance, moderate-to-severe cases may cause:

• Limping or a slight change in gait
• Trouble bending or standing for extended periods
• Exhaustion after physical activity
• Loss of balance
• Lower back pain, tension, and discomfort
• Hip pain, tension, and discomfort
• Runner’s Knee
• Ankle pain, tension, and discomfort
• Plantar fasciitis

As they intensify, these symptoms can severely impact your quality of life, so figuring out why you’re struggling with them and how to resolve them should be a priority. (If you frequently experience aches after standing, check out our blog on 7 Surprising Causes of Back Pain to see how posture plays a role).

The Muscles That Most Often Cause One Leg to Be Longer Than the Other

Some doctors diagnose leg length discrepancy as lateral pelvic tilt or pelvic torsion. That’s because its root cause is often chronic tightness in the core muscles that laterally tilt our pelvis and keep our core stable (the quadratus lumborum, obliques, and iliopsoas). ³

When your iliopsoas muscles are tight and weak from overflexing, your quadratus lumborum muscles become tight and weak from trying so hard to bring the body back to a normal posture. Leg length discrepancy can also cause other back muscles that bend your spine laterally (from side to side) to tighten up too.

When you hike your right hip up, for example, you shift your weight to your left side, and your left rib cage gets pulled down toward your left hip. This also tightens up the muscles on the left side of your waist, left lower back, and left hip. They’ll pull your rib cage downward instead of hiking your hip up.

When you notice that one leg is longer than the other, it could be due to:

• Years of habitual “right-hip-hiked-up-higher-than-left” standing posture that makes certain muscles chronically tight.
• Rigorous athletic activity that strains one leg more than the other.
• Repetitive movements that cause uneven weight carriage.
• Excessively rolling your foot or bowing your knees (knee valgus) when walking.
• Arthritis that causes more wear and tear on one hip, knee, or ankle than the other.

Whatever the root cause, once you’ve learned how to release the chronic tightness in your obliques and iliopsoas, your hips will even out, your pain will subside, and suddenly, your legs will be the same length again!

One Leg Longer Than the Other TEST

Before getting a formal diagnosis from your Doctor of Chiropractic, you may want to grab a friend and do a quick “One Leg Longer Than the Other” test at home:

1. Lay on your back with your legs straight out and your arms at your sides. Rock your hips from side to side gently for about a minute. This should help relax your hips, back, and legs.



2. Ask a friend to grab the bottom of your ankles (their thumbs should be near your top shin, and their fingers should grasp right above your heel).



3. Have your friend do some light traction—lift and pull toward themselves gently for about 15 seconds.



4. Ask your friend to compare the positioning of your anklebones. If they appear even, it’s likely your legs are a similar length.



5. If they are not even, find a reputable chiropractor who can apply a more thorough test and diagnose your misalignment.

What Can a Chiropractor Do If One Leg Is Longer Than the Other?

After a thorough exam, which may include an X-ray, your Doctor of Chiropractic will determine how much misalignment is impacting your pelvis and other joints. Then, specific chiropractic adjustments will be delivered to the spine, hip, pelvis, legs, and feet, along with soft tissue therapy. These therapies can immediately begin to resolve functional leg length discrepancies by:

• Re-aligning the spine
• Restoring normal joint alignment
• Loosening up tight muscles
• Restoring balance and weight distribution
• Improving function
• Reducing pain
• Promoting healing and wellness by making you less prone to injury

To maintain the effects of those adjustments, your DC will also prescribe in-clinic supervised active therapies to gradually release your tight muscles more with each visit. Finally, if the severity of your leg length discrepancy requires it, you will be prescribed orthotics to help support fallen arches, knocked knees, or a rotated hip or pelvis to return to normal alignment and function.

Frequently Asked Questions (FAQs)

Can a chiropractor fix a leg length discrepancy?

Yes. If your discrepancy is functional (caused by muscle imbalances and pelvic misalignments), a chiropractor can correct it using targeted spinal adjustments, soft tissue therapies, and prescribed corrective exercises. If the discrepancy is anatomical, a chiropractor can help manage the resulting joint strain and recommend custom orthotics to level your posture.

Is it normal for one leg to be longer than the other?

Yes, it is incredibly common. Up to 70% of the population has some degree of leg length difference. However, just because it is common does not mean it should be ignored—especially if the imbalance begins to cause lower back pain, knee pain, or a noticeable limp.

How do I know if my leg length difference is anatomical or functional?

An anatomical difference means the bones themselves are different lengths (often due to genetics, surgery, or childhood injury). A functional difference means the bones are equal, but a tilted pelvis or tight muscles pull one leg higher. A chiropractor can take a structural X-ray and perform orthopedic tests to tell you exactly which type you have.

References

1. Knutson, Gary A. Anatomic and functional leg-length inequality: A review and recommendation for clinical decision-making. Part I, anatomic leg-length inequality: prevalence, magnitude, effects and clinical significance. Chiropractic & Osteopathy, vol. 13, no. 1, 2005, p. 11.
2. Gurney, Burke. Leg length discrepancy. Gait & Posture, vol. 15, no. 2, 2002, pp. 195-206.
3. Brady, Rebecca J., et al. Limb Length Inequality: Clinical Implications for Assessment and Intervention. Journal of Orthopaedic & Sports Physical Therapy, vol. 33, 2003, pp. 221-234.