Diagnostics
Infant hip ultrasound
The first weeks with your child bring many new appointments and a great deal of information. Hip ultrasound is one of the examinations whose purpose may not be obvious at first: your baby moves both legs and seems to have no symptoms. Why should the hips still be examined?
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Understanding
A closer look
Ultrasound can show early on whether the hip joints are developing appropriately for the baby's age. Delayed or abnormal development may initially cause no visible difficulties. If abnormalities are identified in good time, appropriate next steps can be planned.
What hip ultrasound tells us
In hip dysplasia, the bony hip socket is not yet developed enough to cover the femoral head, the ball of the hip joint, appropriately for the baby's age. This differs from hip dislocation, in which the femoral head has moved out of its normal position in the socket. Ultrasound shows the infant's structures, which still contain a large amount of cartilage, and helps assess them.
Both hips are assessed. The findings are described using defined features and angles and interpreted alongside age, examination and risk factors. An isolated angle measurement without this context is not a reliable basis for parents to decide on treatment themselves.
When the examination is scheduled
In Germany, hip screening is part of the U3 child health check, normally in the fourth to fifth week of life. Earlier examination may be needed if examination findings are abnormal or certain risks are present, such as breech birth or a family history of hip development disorders. Agree the appropriate timing with your child's paediatric care provider.
Hip ultrasound is one part of early screening and does not replace the full U3 check. When a baby is referred for ultrasound, it should therefore be clear which examination has already taken place and who will provide the remaining routine checks. If an appointment does not seem possible in time, clarify this early with the practice providing care.
Further information
What happens during the ultrasound
For the examination, each hip is imaged in turn with the baby positioned appropriately. Ultrasound gel makes contact with the skin, and a probe produces the images. No X-rays are used. General anaesthesia is not needed for a routine examination.
Calm, well-supported positioning helps image quality. If your child is unsettled, the procedure is adapted accordingly. The total appointment time depends on the process and findings. Allowing enough calm time for careful imaging is more helpful than a fixed time estimate.
What an abnormal finding may mean
Not every abnormality leads to the same treatment. Some findings require follow-up, while others need prompt further paediatric orthopaedic care. The hip type, age, stability and other findings are decisive. You should be told what the finding means for your child and when the next step should take place.
If follow-up or treatment is recommended, keeping the agreed appointments matters. Normal-looking kicking does not reliably show that a previously identified development problem has resolved. Equally, an unclear term in a report should not cause unnecessary worry without a medical explanation.
What to expect and next steps
What parents can prepare
Bring the yellow child health record and any previous reports. Details of the birth, known hip conditions in the family and examinations already carried out are helpful. Clothes that open easily around the hips and legs make the examination simpler.
Fasting is not required for a routine hip ultrasound. Specific instructions from the examining practice take priority. Ask before the appointment if you are unsure whether a referral or other documents are needed. This helps avoid unnecessary delays to the examination or the subsequent sharing of results.
Frequently asked questions
Is the examination necessary if my baby moves both legs well?
A hip development disorder may initially exist without visible symptoms. This is the reason for early screening. Whether earlier or additional follow-up is needed is decided according to the findings and risks.
Is hip ultrasound the same as the U3 check?
No. The U3 check includes other examinations and advice. A separately performed hip ultrasound does not automatically cover these.
Does a finding of hip immaturity mean an abduction brace is needed straight away?
No. What follows depends on age and the precise assessment. A doctor decides on follow-up or treatment; aids should not be chosen independently.
