What Is a Trendelenburg Gait, and What Does It Say About Your Hip?
A Trendelenburg gait is a pattern of walking where one side of the pelvis drops each time you step onto the opposite leg. It usually means the hip abductor muscles on the standing leg are weak or not working properly. It is a clinical sign, not a diagnosis itself, and finding the underlying cause often requires imaging of the whole pelvis and legs while you are weight-bearing.
Key takeaways
- A Trendelenburg gait happens when the hip abductor muscles cannot hold the pelvis level during single-leg stance.
- Common causes include gluteus medius weakness, hip joint problems, nerve issues and leg length differences.
- Lying-down imaging can miss the pelvic drop because gravity and body weight are removed from the equation.
- A standing, whole-body scan captures your true alignment under load, revealing where the chain breaks down.
- Identifying the root cause is the first step toward the right treatment plan.
What does Trendelenburg gait actually look like?
A Trendelenburg gait looks like a dip or drop of the pelvis on the side of the swinging leg. When you stand on one foot, the hip abductors on the standing side should hold the pelvis level. If those muscles are too weak or inhibited, the unsupported side drops and the body often leans sideways to compensate. When this happens with every step, the result is a noticeable side-to-side sway, sometimes described as a waddling gait.
The Trendelenburg sign is the clinical test behind the name. A clinician asks you to stand on one leg and watches whether the opposite hip drops. A positive result does not tell you why the muscles are failing. It only confirms that they are.
There is also something called a compensated Trendelenburg gait. Instead of the pelvis dropping, you lean your upper body over the weak hip to keep your balance. The trunk shift can put extra stress on your spine and the opposite hip over time.
How do you know if you have a hip drop when walking?
You may not realise your pelvis is dropping. Many people simply feel that something is "off" about their walking without being able to pinpoint it. Here are the common signs.
Others may notice a side-to-side sway before you feel it yourself.
Clothes that sit lower on one side can hint at a lateral pelvic tilt.
The hip doing extra work often becomes sore at the outer buttock or greater trochanter.
The spine may curve to compensate for the pelvic drop, creating pain away from the hip itself.
If you also notice numbness, weakness in the leg, or any loss of bladder or bowel control, seek urgent medical attention from your GP, 111, or A&E rather than booking a scan.
What causes a Trendelenburg gait?
A Trendelenburg gait happens when the hip abductors, mainly the gluteus medius, cannot stabilise the pelvis during single-leg stance. Several things can lead to this.
Prolonged sitting, inactivity or post-surgical disuse can weaken these muscles significantly.
Conditions such as hip dysplasia in adults or advanced joint wear can alter how the muscles work around the joint.
Damage or compression of the superior gluteal nerve stops the signal reaching the hip abductors.
Even a small difference in leg length can tilt the pelvis and overload one side.
Surgery may temporarily or permanently change muscle balance around the hip.
Because the body works as a connected chain from feet to head, a weakness at the hip can force the knee, spine or opposite hip to compensate. Pain often shows up away from the real source.
Why does lying-down imaging miss a Trendelenburg pattern?
Standard X-rays, CT and MRI are taken while you lie flat. In that position, gravity is removed and your muscles relax. The pelvic drop that defines a Trendelenburg gait disappears because you are not bearing weight. A scan may show the hip joint looks "normal" even though your walking pattern is clearly abnormal.
An EOS scan captures the pelvis, hips and full legs while you stand. Your muscles are working, gravity is acting on your skeleton, and any pelvic tilt, leg length difference or joint asymmetry is visible in its true, loaded state. This is how ScanAlign standing EOS imaging reveals alignment issues that other scans can miss.
Lying-down imaging is excellent for seeing bone detail and soft tissue. But it removes the very force, your body weight, that causes the pelvis to drop. A hip joint that looks well-aligned on a supine X-ray may sit very differently once you stand up and walk.
When MRI is the better choice: EOS shows bones, joints and alignment under load. If your clinician suspects a soft-tissue injury, a torn labrum, disc problem or nerve compression, MRI is usually the right tool for that job.
A full standing image also supports gait analysis by giving clinicians a structural baseline to compare against what they observe when you walk.
What can be done about a Trendelenburg gait?
The right approach depends entirely on the underlying cause. ScanAlign provides the diagnostic imaging that helps identify that cause. It does not provide treatment. Here are the general directions a clinician may take once the cause is clear.
- Targeted strengthening. If the gluteus medius is weak but the joint and nerve are intact, a structured physiotherapy programme focused on the hip abductors is often the starting point.
- Addressing a leg length difference. Where imaging confirms a meaningful difference, an orthotist or surgeon can discuss options ranging from a simple heel lift to surgical correction.
- Joint-focused care. If the hip joint itself is the problem, orthopaedic assessment may be needed to decide whether conservative management or surgery is appropriate.
- Post-surgical rehabilitation. After hip replacement, specific rehab protocols target the hip abductors to restore gait symmetry.
In every case, accurate imaging of the whole chain, pelvis, hips and legs, under weight-bearing conditions, gives clinicians the clearest picture of what needs attention first.
Wondering whether your hip drop is structural? A standing EOS scan can show you.
Book a free video consultationFrequently asked questions about Trendelenburg gait
It is a walking pattern where one side of your pelvis drops when you step onto the opposite leg. It means the muscles on the standing hip are not strong enough to keep the pelvis level.
The Trendelenburg sign is a clinical test. You stand on one leg and a clinician watches whether the opposite hip drops. A positive sign confirms hip abductor weakness but does not explain the cause.
The most common reason is weakness of the gluteus medius muscle. Other causes include hip joint problems, nerve damage, leg length differences and changes after hip surgery.
They overlap but are not identical. A waddling gait can have several causes. When the waddle is caused specifically by hip abductor weakness and pelvic drop, it fits the Trendelenburg pattern.
A standard lying-down X-ray removes gravity and muscle load, so it cannot show the pelvic drop that defines this gait pattern. A standing, weight-bearing scan is far more revealing for alignment issues.
An EOS scan captures your skeleton from head to toe while you stand, using about 90% less radiation than a standard X-ray, around ten times less. It shows how your joints, pelvis and legs align under your own body weight.
No. ScanAlign is a private self-pay clinic. You can refer yourself directly and start with a free video consultation to discuss whether a scan is right for you.
Yes. EOS uses about 90% less radiation than a standard X-ray, around ten times less. This makes it one of the lowest-dose options available for full skeletal imaging.
That depends on the cause. Many cases improve significantly with targeted physiotherapy. Others may need further intervention. The first step is always accurate diagnosis through proper imaging and clinical assessment.
Pricing details are on our frequently asked questions page. Your free video consultation will also confirm exactly what is included.
See what standing imaging reveals about your hip
A free video consultation is the easiest way to find out whether a standing EOS scan is right for you. No referral needed, no obligation.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- Hardcastle P, Nade S. The significance of the Trendelenburg test. Journal of Bone and Joint Surgery (British Volume). 1985;67-B(5):741-746.
- NHS. Hip pain in adults. nhs.uk. Available at: https://www.nhs.uk/conditions/hip-pain/
- Illés T, Somoskeöy S. The EOS imaging system and its uses in daily orthopaedic practice. International Orthopaedics. 2012;36(7):1405-1411.
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.