Developmental dysplasia of the hip (DDH) is a condition where the hip joint does not develop normally. The ball at the top of the thigh bone is loose or slips out of the hip socket, and without early treatment it can affect walking and cause long-term hip problems. This article explains what DDH is, how it is detected, what treatment looks like, and how parents can support healthy hip development.
DDH is an umbrella term for a range of hip problems in infants and young children. The hip may be shallow, dislocatable, partially out of joint, or fully dislocated. It can be present at birth or develop during the first months of life.
Parents often ask why one baby gets DDH and another does not. There is no single cause. Instead, a mix of genetics, fetal positioning, and hormones during pregnancy can make the hip joint unstable. For example, a baby in the breech position has less room to move, and that can put extra pressure on the developing hips.
The first months of life are the best window for treating DDH because the baby’s hip bones are still soft and growing. If the hip is placed back into the socket early, the socket can reshape around the ball and become stable. Detecting DDH late makes treatment harder and may require surgery.
“A hip that is stable and well-positioned in infancy is more likely to grow into a healthy joint for life.”
A practical example: a baby born with a mild click in the hip may have a normal ultrasound one month later, but a follow-up exam at two months may reveal instability. This is why routine checks are scheduled over several visits.
DDH can happen in any baby, but some babies have a higher chance of being affected. Knowing the risk factors helps parents and doctors stay alert.
If your baby has one or more of these risk factors, the healthcare team may recommend an ultrasound even if the physical exam looks normal. This is a preventive step, not a diagnosis.
Screening starts right after birth and continues at well-child visits. The doctor uses physical exam maneuvers and, if needed, imaging tests to see whether the hip is stable.
Physical exams are useful but not perfect. A hip can feel normal in the first days of life and still become unstable later. That is why parents should also watch for asymmetry in leg folds or a delay in crawling and walking, although these signs are not always reliable.
| Test | Typical Timing | What It Helps Detect |
|---|---|---|
| Newborn physical exam | First 24 to 72 hours | Instability, dislocation, or limited hip movement |
| Ultrasound | Before 4 to 6 months | Socket shape, hip position, and joint stability |
| X-ray | After 4 to 6 months | Bony socket maturity and long-term alignment |
Treatment depends on the child’s age, the severity of the condition, and how stable the hip is. The goal is to keep the ball deep inside the socket so the joint can grow properly.
“A Pavlik harness works best when the hip is flexible and the child is under six months old.”
For example, a two-month-old with a shallow socket may need the harness for six to twelve weeks. The doctor checks the hip with ultrasound every few weeks to see whether the socket is deepening. If the harness does not improve the hip, the baby may need a special cast called a spica cast.
In this age group, the bones are more developed but still able to remodel. Closed reduction avoids cutting open the joint, but it may not work if the hip has been dislocated for a long time. In that case, surgery may be needed.
Surgery is more involved and has a longer recovery, but it can still give good long-term results. The key is to treat DDH before the hip joint develops permanent damage.
Even before a diagnosis, parents can practice hip-healthy positioning. The goal is to let the baby’s legs rest naturally, with the knees bent and the thighs spread apart.
A simple example: when you place a baby in a car seat, allow the legs to bend outwards instead of pressing them together. This small habit supports healthy hip joint development and is safe for the baby.
Most babies treated for DDH go on to walk, run, and play normally. The risk of long-term problems depends on how early the hip is stabilized and whether both hips are affected.
Parents often worry about the future, but most children with DDH do very well. The longer the condition goes untreated, the more complex the outlook becomes. That is why routine screening and early response make such a difference.
Developmental dysplasia of the hip is a problem with how the hip joint forms. The ball at the top of the thigh bone does not fit firmly into the hip socket, which can lead to looseness, partial dislocation, or complete dislocation.
In infants, DDH usually does not cause obvious pain. The discomfort becomes more noticeable when a child is older and has a persistent limp or joint stiffness.
Some mild instability resolves on its own in the first weeks of life. However, established DDH that is still present after the newborn period usually needs treatment. Waiting too long can make the condition harder to correct.
DDH can be diagnosed at birth, during routine infant checkups, or later if the child develops a limp. In many countries, screening begins in the newborn nursery and continues through early childhood.
A Pavlik harness is often worn full-time for six to twelve weeks. The doctor uses ultrasound to monitor progress and may adjust the schedule based on how quickly the hip stabilizes.
Untreated DDH can lead to a noticeable limp, limited hip movement, leg length difference, and early hip arthritis. In severe cases, the hip may remain dislocated into adulthood.
Parents should not perform corrective hip exercises unless a doctor or physiotherapist recommends them. The right treatment is positioning or bracing, not pulling on the baby’s legs.
Yes, developmental dysplasia can affect one hip or both hips. When both hips are involved, the signs can be less obvious because both legs look similar, so imaging tests are often useful.
Swaddling is safe when the legs are allowed to bend and spread naturally. Tight swaddling that forces the legs straight and together can increase the risk of DDH or slow down correction.
Many children need periodic monitoring until their bones finish growing. Later, they may not need regular visits unless symptoms appear. A child who had DDH should tell their adult doctor about their history so joint health is followed over time.
