A Trendelenburg gait is a walking pattern where your pelvis drops on one side with each step, caused by weakness in the hip muscles that normally keep your pelvis level. When you lift one foot off the ground to walk, the opposite hip should hold steady. In a Trendelenburg gait, it can’t, so the unsupported side sinks downward, creating a noticeable dip or waddle.
How Normal Walking Keeps Your Pelvis Level
Every time you take a step, one leg bears your full body weight while the other swings forward. During that split second of single-leg stance, the muscles on the outside of your weight-bearing hip contract hard to keep your pelvis from tilting. The two muscles doing most of this work are the gluteus medius and gluteus minimus, which sit deep on the outer surface of your hip. They pull the pelvis toward the standing leg, holding it roughly horizontal so you can swing the other leg through smoothly.
When those muscles are too weak, paralyzed, or inhibited by pain, they can’t anchor the pelvis. The side with the swinging leg drops below level. So if the abductors near your right hip are weak, your pelvis will dip to the left every time you lift your left foot. Over many steps, this creates a rhythmic, side-to-side tilting that’s visible from behind.
Compensated vs. Uncompensated Patterns
Not everyone with hip abductor weakness looks the same when they walk. In the uncompensated version, the pelvis simply drops on the swing side with no adjustment. This is the classic Trendelenburg gait, and it places extra stress on the affected hip.
Many people unconsciously develop a compensated pattern instead. Rather than letting the pelvis drop, they lean their trunk sideways over the weak hip during stance. This shifts the center of gravity directly over the standing leg, reducing the demand on those weak muscles and minimizing pelvic drop. The trade-off is a pronounced lateral trunk sway, sometimes called a Duchenne lurch. It protects the hip but loads the spine and opposite side unevenly, which can cause problems over time. Research on adolescents with Legg-Calvé-Perthes disease has found that the uncompensated version overloads the affected hip enough that clinicians consider it something to actively correct rather than leave alone.
Common Causes
Weak hip abductor muscles are the most common cause overall, but that weakness can stem from many different conditions. The underlying problems generally fall into a few categories.
Structural Hip Problems
Any condition that changes the geometry of the hip joint can bring the attachment points of the gluteus medius closer together, making the muscle mechanically less effective even if it’s technically healthy. This includes hip dislocation or subluxation, coxa vara (where the angle of the thighbone is steeper than normal), greater trochanter fractures, femoral neck fractures, and developmental hip dysplasia. In children and adolescents, slipped capital femoral epiphysis and Legg-Calvé-Perthes disease are well-known causes.
Nerve Damage
The superior gluteal nerve powers both the gluteus medius and minimus. If that nerve is injured, those muscles can’t fire properly regardless of how strong they once were. Nerve damage can happen during hip surgery, from a herniated disc compressing a nerve root in the lower back, or from conditions like polio. It’s one reason a Trendelenburg gait sometimes appears in the weeks after a total hip replacement.
Muscle Disease and Neurological Conditions
Muscular dystrophy, other muscle-wasting diseases, and hemiplegic cerebral palsy all can weaken the hip abductors directly. Osteoarthritis of the hip is another frequent culprit: it doesn’t always destroy the muscle itself, but pain causes the brain to inhibit the muscle from firing fully, a protective reflex called gluteal inhibition. Lower back pain can trigger the same effect.
How It’s Diagnosed
The classic clinical check is the Trendelenburg test. You stand on one leg for up to 30 seconds while a clinician watches your pelvis and trunk from behind. A negative (normal) result means your pelvis stays level and your trunk stays centered. A positive result shows up in one of two ways: the pelvis on the non-standing side drops below level, or you lean your trunk over the standing leg to compensate for weak abductors. Both count as a positive finding.
Sometimes the drop is immediate. Other times the pelvis starts level and gradually sinks over the 30-second window, which is why holding the position matters. The test has reasonable accuracy for detecting underlying problems. In one study of women with suspected hip abductor tears, the Trendelenburg sign predicted a torn tendon with about 73% sensitivity and 77% specificity. It’s not perfect, and roughly 10% of patients with hip pain produce a false-positive result, so imaging with MRI or ultrasound is often used to confirm what’s actually going on inside the joint.
How It Differs From a Pain Limp
A Trendelenburg gait is easy to confuse with an antalgic gait, which is simply a limp caused by pain. The key difference is what you’re watching. In an antalgic gait, the person shortens the time spent standing on the painful leg, rushing off it as quickly as possible. The stride looks uneven in timing. In a Trendelenburg gait, the hallmark is the pelvic drop or lateral trunk lean, and the person may spend a normal amount of time on the affected leg. The two can overlap, since hip pain can both cause a limp and inhibit the abductor muscles, but the pelvic tilt is the distinguishing feature.
Treatment and Rehabilitation
Treatment depends entirely on the underlying cause. When a structural problem like hip dysplasia or a fracture is responsible, addressing that condition is the priority. In children, this might mean bracing or casting. In adults with a torn gluteus medius tendon, surgery becomes an option if physical therapy doesn’t resolve the problem. Surgical repair involves reattaching the torn tendon to the bone using suture anchors, and it can be done through an open incision or endoscopically. Endoscopic repair tends to have fewer complications, including a lower rate of re-tearing.
For the majority of people whose Trendelenburg gait comes from muscle weakness rather than a complete tear, physical therapy is the primary treatment. Rehabilitation follows a general progression that can span six months or longer.
The first six weeks focus on protection and gentle activation: isometric squeezes of the core and hip muscles, light stationary cycling with no resistance, and learning to engage the right muscles without overloading them. From roughly weeks 7 through 12, you begin actual strengthening, including resistance exercises for the hip abductors and rotators, weight-shifting drills, and gait retraining without assistive devices. This is typically when people transition off crutches or a cane.
Weeks 13 through 23 are the advanced strengthening phase. Single-leg exercises enter the picture around week 16, along with dynamic balance work and low-impact cardio like the elliptical or pool jogging. After about six months, those returning to sports add plyometrics and sport-specific drills. Throughout this process, core stability work runs in parallel, because the trunk and pelvis function as a unit during walking.
The timeline varies significantly depending on the cause. Someone recovering from a surgical tendon repair will follow the full six-month-plus protocol. Someone whose weakness stems from prolonged inactivity or mild nerve irritation may see improvement in weeks with targeted exercise. The common thread is that the hip abductors respond well to progressive loading, and most people see meaningful changes in their gait pattern once those muscles can hold the pelvis steady during single-leg stance.