Developmental Dysplasia Of The Hip Ddh

Overview

Developmental dysplasia of the hip (DDH) is a condition where a baby's hip joint does not form properly. The hip is a ball-and-socket joint: the top of the thigh bone is the ball, and part of the pelvis is the socket. In DDH the socket may be too shallow, or the ball may sit loosely or slip partly out of the socket. 'Dysplasia' simply means the joint did not grow in the usual shape. DDH can range from a slightly shallow socket to a hip that is fully dislocated (out of place). It is not a sign that anything went wrong during pregnancy or birth, and it does not mean the parents did anything wrong.

DDH is one of the more common conditions found in newborns. Roughly 1 to 3 in every 100 babies need some treatment, and many more have mild looseness that settles on its own without any treatment.

DDH mostly affects babies, especially girls, first-born babies, and babies who were in a breech position (bottom or feet first) late in pregnancy. It can also run in families. Adults can be affected too, when a mild hip problem from childhood was never noticed or treated.

Symptoms

Common symptoms

• One leg looking shorter than the other
• Extra skin creases on one thigh, or creases that do not match on both sides
• The hip feeling stiff or not opening out fully when you change a nappy or dress the baby
• A clicking or clunking feeling in the hip when it is moved
• One foot turning outward more than the other
• No symptoms at all — many babies with DDH look and behave completely normally

Symptoms in children

• Limping, or walking on tiptoes on one side
• A waddling walk, especially if both hips are affected
• One leg that seems longer or shorter than the other
• Walking later than expected, or a preference for one leg
• Usually no pain in young children — the problem is more about how the hip moves and grows

Symptoms in older adults

• Groin or hip pain, especially with walking or stairs
• Stiffness in the hip, particularly in the morning or after sitting
• A limp or a feeling that one leg works less well
• Earlier-than-usual wear and tear (osteoarthritis) in the hip
• Pain that may also be felt in the thigh or knee

Causes

Main causes

• The hip joint does not form in the usual shape during pregnancy and early life — the socket stays shallow and the ball sits loosely
• Loose ligaments around the hip in newborns, which can let the ball slip out of the socket
• The exact cause is not fully known, and it is likely a mix of genes and how the baby lies in the womb

Risk factors

• Being in a breech position (bottom or feet first) late in pregnancy
• Being a girl — DDH is more common in girls
• Being a first-born baby
• A family history of DDH or hip problems in childhood
• Being a twin or triplet, or having less fluid around the baby in the womb
• Swaddling with the legs straight and tightly wrapped, which keeps the hips pressed together
• Some conditions that affect how the baby's muscles or joints develop

When to see a doctor

See a doctor urgently if:

• You notice one leg looks shorter, or the thigh creases do not match
• Your baby's hip feels stiff or does not open out when you change a nappy
• Your child starts limping or walks with a waddle
• A harness or cast is rubbing, slipping, or your child seems in pain
• A hot, swollen or very painful joint, or a child who refuses to walk or move a leg

Book a routine appointment if:

• You have a family history of hip problems and want to talk about checking your baby
• You are unsure about how to swaddle safely
• You have hip or groin pain as an adult and wonder whether it could be related to a childhood hip problem
• You have questions about hip checks at the newborn or 6 to 8 week baby appointment

Diagnosis

DDH is usually found during routine baby checks. A doctor or nurse will gently move your baby's hips to feel whether the ball slips in and out of the socket, and will look at the leg length and skin creases. If anything seems unusual, or if your baby has risk factors, a scan or X-ray may be arranged. In older children and adults, the doctor will ask about walking, pain and movement, and may arrange imaging.

Tests that may be done

• Physical hip examination — gentle hands-on checks of movement and stability
• Ultrasound scan of the hips — the usual test for babies up to about 4 to 6 months old, because their hip cartilage shows up well on sound waves
• X-ray of the hips — used for older babies, children and adults, once the hip bones have hardened
• A gait (walking) check for children who are already walking
• Sometimes a repeat scan a few weeks later, to see whether a mild problem is settling

What to expect at your appointment

The hip checks are quick and gentle, and babies usually do not mind them. If a scan is needed, it is painless and you can stay with your baby. You may be given a follow-up appointment even if the first check was normal, because some hips only show changes as the baby grows. Waiting for results can feel worrying — ask your care team to explain what they are looking for and what happens next.

Treatment

Treatment depends on your child's age and how severe the hip problem is. Some mild cases need only monitoring. When treatment is needed, the aim is to guide the ball into the socket and keep it there while the hip grows into a better shape. Babies treated in the first few months usually need the simplest treatment, and most do very well.

Self-care at home

• Swaddle your baby with the hips bent up and out, so the legs can move freely — avoid tight wrapping with straight legs
• Use a sling or carrier that supports the hips in a seated, knees-up position
• Follow your care team's instructions about how long the harness or brace should be worn each day
• Check the skin under straps and casts daily for redness or sore patches, and keep the area clean and dry
• Choose clothes that fit over a harness or cast easily, and use the recommended car seat or support cushion
• Keep up with follow-up appointments, even if everything looks fine

Medical treatments

The most common first treatment for young babies is a soft harness worn for several weeks. It holds the hips in a good position while the joint develops, and it can be taken off for bathing according to your care team's advice. If a harness is not enough, or if the baby is older, a brace or a cast that holds the legs apart may be used. Some children need a short procedure under anaesthetic to put the hip back in place, followed by a period in a cast. Later, if the hip joint or the bones around it need reshaping, orthopaedic (bone and joint) specialists may recommend surgery. Your care team will explain the options, the expected timings and what to expect at each stage. Always ask your own doctor, specialist nurse or pharmacist about any medicines, including pain relief, and follow their advice rather than anything you read online.

When is surgery considered?

Surgery is not needed for most babies with DDH. It may be considered when a harness or cast has not worked, when the hip is still out of place, when the problem is found later in childhood, or when the shape of the hip bones needs correcting as your child grows. In adults, surgery such as hip replacement may be suggested if a childhood hip problem has led to ongoing pain and joint wear. Your specialist team will talk through the benefits, risks and recovery involved.

Living with this condition

Caring for a baby in a harness or cast takes some adjustment at first, but most families find a routine within a week or two. Nappy changes, feeding and carrying all still work — you just need a little more room and patience. Older children in a cast may need help with washing, dressing and getting around, and may need time off nursery or school for a short period. Ask your care team about practical help, equipment and what to expect week by week.

Lifestyle tips

• Keep up gentle, normal handling and cuddles — babies still need tummy time and interaction
• For older children, follow advice about safe movement and returning to play or sport
• For adults with hip pain, stay active with low-impact movement such as swimming, cycling or walking
• Keep a simple note of appointment dates, harness hours and any skin changes to mention at check-ups
• Ask about support at home, childcare and school so the routine does not fall on one person alone

Diet and exercise

There is no special diet that treats DDH. Usual healthy eating for you and your child is enough, and breastfed or formula-fed babies should feed as normal. Movement matters: babies should be able to kick and move their legs freely when out of the harness, and older children and adults should stay active in ways that feel comfortable. If a child is in a cast, ask your care team which activities are safe and when sport can restart.

Mental health and emotional wellbeing

Hearing that your baby or child needs hip treatment can bring up worry, guilt or stress, and it is completely normal to feel that way. Parents often say the first weeks are the hardest and that things feel easier once a routine settles. Older children may feel frustrated or left out, and adults with hip pain can feel low or tired. Talk to your care team about how you are feeling — support is available, and you do not have to cope alone. If you or your child feel very low, anxious or hopeless, contact your doctor or a local mental health service. If there is any risk of harm to yourself or someone else, contact your local emergency number or a crisis line straight away.

Prevention

DDH cannot always be prevented, because how a baby's hip forms is partly down to genetics and position in the womb. But there are things that lower the chance of hip problems getting worse: avoid tight swaddling with straight legs, use baby carriers that support a knees-up position, and go to all routine baby checks so any hip problem is found early.

Screening programmes

In the UK and many other countries, every newborn has a hip examination, and it is repeated at the 6 to 8 week baby check. Babies with risk factors, such as a breech position or a family history, may be offered an ultrasound scan even if the examination feels normal. Screening is not perfect — some cases are picked up later — so mention any concerns at any age.

Complications

If left untreated

• One leg may end up slightly shorter than the other
• A limp or a waddling walk that continues as the child grows
• The hip joint may wear out earlier than usual, leading to osteoarthritis in adulthood
• The hip may be harder to treat if the problem is found later rather than in early infancy
• Rarely, problems with the blood supply to the hip bone can occur, and this is watched for during treatment

Long-term outlook

The outlook is good for most children. When DDH is found and treated early, the great majority of hips develop well and children go on to walk, run and play normally. Some children need more than one stage of treatment, and a small number have ongoing hip issues that need monitoring into adulthood. Regular follow-up means any change can be picked up and managed early. If you have questions about your own or your child's outlook, your specialist team can give you a clearer picture.

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