Hip Dysplasia

What is hip dysplasia?

Hip dysplasia is a condition in which the hip joint does not form correctly. The hip is a ball-and-socket joint: the rounded top of the thigh bone (the femoral head) sits inside a cup-shaped socket in the pelvis (the acetabulum). In hip dysplasia, the socket is too shallow or shaped abnormally, so it does not fully cover and hold the ball. Depending on how severe this is, the joint may be loose, partially out of place (subluxated), or completely out of the socket (dislocated).

Many people first hear the term in relation to newborn babies, where it is often called developmental dysplasia of the hip (DDH). This is one of the most common skeletal conditions checked for at birth, and it ranges from mild instability that resolves on its own to a fully dislocated hip that needs treatment. However, hip dysplasia is not only a childhood condition. Milder forms sometimes go unnoticed for years and only cause problems in adolescence or adulthood, when the poorly covered joint begins to wear unevenly and cause pain.

Understanding what is hip dysplasia matters because early recognition usually makes treatment simpler. In infants, the skeleton is still soft and adaptable, so gentle methods often guide the hip into a normal shape. In adults, the focus shifts to relieving pain, protecting the cartilage, and, in some cases, surgically correcting the shape of the joint. Hip dysplasia can affect one hip or both, and it occurs in all populations, although it is noticeably more common in girls and in certain family and birth situations described below.

Symptoms of hip dysplasia

Hip dysplasia symptoms depend strongly on the age of the person and how severe the abnormality is. A newborn with a dislocated hip usually has no pain at all, while an adult with a mildly shallow socket may develop significant groin pain over time. Because of this wide range, it helps to look at symptoms by stage of life.

Signs in babies and infants

Infants with hip dysplasia typically do not appear uncomfortable. The signs are physical findings that parents or doctors may notice:

• Uneven skin folds on the thighs or buttocks when the legs are compared.
• One leg appearing shorter than the other.
• Reduced movement or flexibility in one hip, for example when changing a diaper the leg on the affected side may not spread outward as far.
• A clicking or clunking sensation when the hip moves, which a doctor may feel during examination.

None of these signs proves that a baby has hip dysplasia, and some babies with the condition show no visible signs at all, which is why routine newborn hip checks are important.

Signs in toddlers and older children

• A limp or an unusual, waddling walk once the child starts walking.
• Walking on the toes of one foot to compensate for a leg-length difference.
• A noticeable leg-length difference that becomes clearer as the child grows.

Symptoms in adolescents and adults

When hip dysplasia is mild or was never diagnosed in childhood, symptoms often first appear in the teenage years or early adulthood, particularly in active people:

• Groin pain, often deep and aching, that worsens with activity such as running, prolonged walking, or standing.
• Pain at the side of the hip or, less commonly, in the buttock.
• A catching, locking, or popping sensation in the hip, which can occur when the labrum (the ring of cartilage around the rim of the socket) is strained or torn.
• A feeling of instability, as if the hip might give way.
• Stiffness and reduced range of motion in later stages, as the cartilage wears down.

In adults, symptoms often progress gradually. Early on, pain may occur only after intense activity. Over time, if the joint surface wears unevenly, pain can become more frequent and eventually occur at rest. Advanced, untreated hip dysplasia is a recognized cause of early hip osteoarthritis, which is the wearing away of the smooth cartilage that cushions the joint.

Causes and risk factors

Hip dysplasia causes are usually a combination of inherited tendency and mechanical factors around the time of birth, rather than anything a parent did wrong. The hip socket depends on the ball sitting firmly inside it to develop a normal, deep shape. Anything that keeps the ball loosely positioned, or crowds the baby’s hips before or after birth, can interfere with this process.

Recognized risk factors include:

• Female sex. Hip dysplasia is considerably more common in girls, which may relate to greater sensitivity to maternal hormones that loosen ligaments before delivery.
• Family history. Having a parent or sibling with hip dysplasia increases a baby’s risk.
• Breech position. Babies positioned bottom-first in the womb, especially in the final months of pregnancy, have a higher risk because their hips are held flexed and folded.
• First pregnancy. The uterus is often tighter in a first pregnancy, leaving less room for the baby to move.
• Reduced amniotic fluid (oligohydramnios), which limits space in the womb.
• Tight swaddling after birth. Wrapping a baby with the legs held straight and pressed together can encourage the hip to slip out of position. Swaddling that leaves room for the hips to bend and spread is generally considered safer for hip development.
• Other packaging conditions. Conditions linked to limited space in the womb, such as certain foot deformities or a tilted neck posture (torticollis), sometimes occur alongside hip dysplasia.

In adolescents and adults who are diagnosed later, the underlying cause is usually the same developmental process: the socket simply never became deep enough during growth. In these milder cases, no obvious risk factor may ever be identified.

Diagnosis

Hip dysplasia diagnosis depends on age, because the tools that work best change as the skeleton matures.

Newborns and infants

Every newborn typically has a hip examination shortly after birth and at routine well-baby visits. The doctor gently moves the hips through specific maneuvers to feel for instability — whether the ball can be pushed out of the socket or guided back in. A clunk or obvious instability raises concern for hip dysplasia.

Because much of a young infant’s hip is still cartilage, which does not show well on X-rays, ultrasound is the preferred imaging test in the first months of life. Ultrasound allows the doctor to see the shape of the socket, how deeply the ball sits within it, and how stable the joint is when gently stressed. Babies with risk factors such as breech position or a family history are often referred for ultrasound even if their physical examination is normal.

Older infants and children

From roughly six months of age onward, as the bone in the femoral head hardens, X-rays become the standard imaging test. X-rays let doctors measure the angle and depth of the socket and confirm whether the hip is properly located.

Adolescents and adults

In older patients, diagnosis usually begins because of hip or groin pain. The doctor takes a history, examines hip movement, and looks for signs of instability or labral irritation. Imaging typically includes:

• Standing pelvis X-rays, on which doctors measure how well the socket covers the femoral head using established angle measurements.
• MRI (magnetic resonance imaging), a scan that shows soft tissues, which may be used to look for labral tears and to assess the health of the cartilage.
• CT (computed tomography) scans in some cases, to map the three-dimensional shape of the joint, particularly when surgery is being planned.

Mild hip dysplasia in adults is sometimes missed at first, because the pain can resemble a muscle strain or an isolated labral tear. Careful measurement on properly taken X-rays is usually what confirms the diagnosis.

Treatment options for hip dysplasia

Hip dysplasia treatment aims to place and keep the ball securely in the socket so the joint can develop or function normally, to relieve pain, and to protect the cartilage from early wear. The right approach depends heavily on age and severity, and decisions are individual — your doctor will weigh the shape of the joint, symptoms, activity level, and the condition of the cartilage. This condition is generally managed by orthopedic specialists; in the Acibadem network, for example, care is coordinated through the Orthopedics & Joint Center, often together with pediatric specialists when the patient is a child.

Watchful waiting in newborns

Very mild hip instability is common in the first days of life and often resolves on its own within a few weeks as ligaments tighten. In these cases, doctors may simply re-examine the baby and repeat the ultrasound rather than start treatment immediately.

Harness and brace treatment in infants

For infants with confirmed hip dysplasia, the standard first treatment is a soft positioning device, most commonly a Pavlik harness. This harness holds the baby’s hips bent and gently spread, keeping the ball centered in the socket so the socket can deepen naturally as the child grows. The harness is usually worn for several weeks to a few months, with regular check-ups and ultrasounds to confirm progress. In many cases, harness treatment started early is successful and no further intervention is needed. If the harness does not achieve a stable hip, doctors may switch to a firmer brace.

Closed reduction and casting

If brace treatment fails, or if the diagnosis is made after roughly six months of age, the doctor may recommend a closed reduction. Under anesthesia, the hip is gently guided into the socket without an incision, and a body cast called a spica cast holds the hip in position for several weeks to months while the joint stabilizes.

Surgery in children

When the hip cannot be positioned by gentle means, or when the diagnosis is made in an older child, open reduction surgery may be needed. The surgeon opens the joint, removes any tissue blocking the socket, and places the ball correctly. In some children, the surgeon also reshapes the socket or the thigh bone (procedures called osteotomies, meaning controlled surgical cuts in bone) so that the joint fits together properly. Casting and careful follow-up usually follow surgery, and children treated for hip dysplasia are typically monitored with periodic X-rays until they finish growing.

Non-surgical care in adolescents and adults

For adults with mild dysplasia and manageable symptoms, doctors often begin with conservative measures:

• Activity modification, reducing high-impact activities that aggravate pain.
• Physical therapy to strengthen the muscles around the hip and improve movement patterns, which may reduce strain on the joint.
• Pain-relieving medication, such as anti-inflammatory drugs, used under medical guidance to control symptoms. Medication does not correct the shape of the joint.
• Weight management, since extra body weight increases load on the hip.

Surgery in adolescents and adults

When the socket is clearly too shallow and symptoms persist, and the cartilage is still in reasonably good condition, surgeons may recommend a periacetabular osteotomy (PAO). In this operation, the surgeon cuts the pelvic bone around the socket and rotates the socket into a better position so it covers the femoral head more completely. The goal is to relieve pain and slow or prevent the development of arthritis. Recovery involves a period on crutches and structured rehabilitation, and outcomes depend on factors such as the amount of pre-existing cartilage damage.

Hip arthroscopy — keyhole surgery using a small camera — is sometimes used to address a torn labrum, but in true dysplasia it is generally not a stand-alone solution, because it does not correct the shallow socket.

If hip dysplasia has already led to advanced osteoarthritis, total hip replacement — replacing the damaged ball and socket with artificial components — is often the most reliable way to relieve pain and restore function. Replacement in dysplastic hips can be technically more complex than in ordinary arthritis, so it is usually planned carefully with detailed imaging.

Living with hip dysplasia and outlook

The outlook for hip dysplasia is generally good when it is found and treated early. Most infants treated promptly with a harness go on to have normally functioning hips and no restrictions in childhood activities. The later the condition is discovered, the more involved treatment tends to be, and the higher the chance of some long-term effect on the joint — but even then, many people do well with appropriate care.

Children who have been treated for hip dysplasia are usually followed with periodic examinations and X-rays until skeletal maturity, because in a minority of cases the socket does not develop fully and further treatment is considered. Attending these follow-up visits is one of the most important things families can do.

Adults living with hip dysplasia often benefit from staying active in ways that are kind to the joint — swimming, cycling, and strength training are frequently better tolerated than repetitive high-impact sports, although tolerance varies from person to person. Keeping the muscles around the hip strong, maintaining a healthy weight, and reporting new or worsening pain to a doctor early can all help protect the joint. It is honest to say that untreated or severe dysplasia increases the risk of early osteoarthritis; it is equally honest to say that modern joint-preserving surgery and, when needed, hip replacement give most patients meaningful relief. No treatment can guarantee a specific outcome, and your care team can explain what is realistic in your individual situation.

Frequently asked questions

What is hip dysplasia in simple terms?

Hip dysplasia means the hip socket is too shallow to hold the ball of the thigh bone securely. The joint may be loose, partly out of place, or fully dislocated. It most often begins before or shortly after birth, but milder forms are sometimes discovered only in adolescence or adulthood when the hip starts to hurt.

Can hip dysplasia heal on its own?

Very mild hip looseness in newborns often resolves without treatment during the first weeks of life, which is why doctors sometimes recommend watchful waiting with repeat checks. True dysplasia — a socket that is clearly shallow — generally does not correct itself, especially after infancy, and usually requires treatment such as a harness, casting, or surgery depending on age and severity.

How serious is hip dysplasia if it is not treated?

Untreated hip dysplasia can lead to a limp, a leg-length difference, chronic pain, labral tears, and early osteoarthritis of the hip, sometimes requiring hip replacement at a relatively young age. The severity varies widely: some people with mild dysplasia have few problems for decades, while others develop significant symptoms early. Early diagnosis generally allows simpler and more effective treatment.

What are the first hip dysplasia symptoms parents should look for?

In babies, look for uneven thigh or buttock skin folds, one leg that seems shorter, a hip that does not spread outward as far as the other during diaper changes, or a clicking sensation with movement. In walking children, a limp or waddling gait can be a sign. Because some babies show no visible signs, routine newborn hip checks and any recommended ultrasounds are important even when everything looks normal.

How is hip dysplasia diagnosed in adults?

Adults are usually diagnosed after they develop groin or hip pain. Doctors examine the hip and order standing pelvis X-rays, on which they measure how well the socket covers the ball. An MRI scan may be added to check for labral tears and assess cartilage health, and a CT scan is sometimes used to plan surgery. Mild cases can be missed initially, so persistent hip pain deserves a thorough evaluation.

What does recovery look like after hip dysplasia surgery?

Recovery depends on the procedure and the patient’s age. Infants treated with casting typically wear a spica cast for a period of weeks to months. Adults who undergo a periacetabular osteotomy usually spend several weeks on crutches followed by months of gradual rehabilitation before returning to full activity. Hip replacement recovery is generally faster for everyday function, though full recovery still takes months. Your surgical team can outline a realistic timeline for your specific operation.

Can adults with hip dysplasia stay active or play sports?

Many can, within limits that depend on symptoms and the condition of the joint. Lower-impact activities such as swimming, cycling, and supervised strength training are often well tolerated, while repetitive high-impact sports may aggravate pain in some people. There is no single rule that fits everyone, so it is sensible to discuss activity choices with a doctor or physical therapist familiar with your hip.

When to see a doctor

Talk to a doctor if you notice possible signs of hip dysplasia in a child — uneven skin folds, a leg-length difference, limited hip movement, a limp, or an unusual walk — or if you have persistent groin or hip pain, catching, or instability as an adolescent or adult. Early evaluation usually means simpler treatment.

Seek medical attention promptly if any of the following occur:

• Sudden severe hip pain or an inability to bear weight on the leg, especially after a fall or injury.
• A hip that appears deformed, or a leg that suddenly looks shortened or turned outward or inward.
• Hip pain with fever, chills, or a child who refuses to walk or move the leg, which can signal a joint infection needing urgent care.
• Rapidly worsening pain, swelling, or numbness in the hip, thigh, or leg.
• After hip surgery: increasing pain, wound redness or drainage, fever, calf swelling, or new numbness or weakness in the leg.

For non-urgent concerns — gradually increasing hip pain, stiffness, clicking, or questions about a previously treated childhood hip — a scheduled visit with an orthopedic specialist is the appropriate next step. Bringing any previous X-rays or reports to the appointment can help the doctor assess how the hip has changed over time.