The hip is where the thigh bone and pelvis meet. The thigh bone has a ball-shaped top. This ball fits into a cup-shaped area on the pelvis. Developmental dysplasia of the hip (DDH) is a problem with how these bones fit together. The exact problem can vary between children but may include: Ball of the thigh is loose inside the cup of the pelvis—makes the hip unstableBall moves easily out of the cup—causing a dislocation of the hipBall and cup do not meet at allThe cup is improperly shaped
The Hip Joint
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The exact cause of DDH is not known. Some factors that may play a role include: How the baby is positioned in the wombMaternal hormonesGenetics
Certain carrying or wrapping techniques may also affect the growth of the hip, especially methods that have the child tightly bound in a position with the hips straight out and turned in.
DDH is more common in females. Other factors that may increase your baby’s chance of developing DDH include: Family history of DDHBreech birth (feet first), especially in femalesLow levels of amniotic fluid during pregnancyLate delivery—birth after 42 weeks of pregnancyBirthweight greater than 8 pounds 13 ounces (4 kg)
DDH can make the hip unstable and loose. Symptoms may depend on the age of your child. They may include: Uneven folds in the area of the thigh or hip—may be visible in newbornsPoor mobility and flexibility when beginning to crawl—around 9 monthsOne leg shorter than the other—10-11 monthsLimping, lurching, walking on toes, or other unevenness in walk at about 1 year
DDH more commonly affects the left hip. Sometimes both hip joints are affected. The condition may be detected when the baby is born.
Your child's doctor will look for signs of DDH during the
first physical exam, and every exam in the first year. The hip will be stressed gently to see if it moves, or makes a clunking or popping noise. This may indicate a dislocating hip.
The hip may also be assessed with: A test done by placing the baby on his or her back and checking the height of the knees.Looking for uneven folds in the hip or thighMoving the knees apart—difficulty or limitation with motion indicates a problem
Detailed pictures of the hip may help confirm the diagnosis or determine treatment. The pictures can be made with: Ultrasound—in babies less than 4 months oldX-rays—in babies 4 months and older
Talk with the doctor about the best treatment plan for your baby. Depending on your baby’s age and the severity of the condition, treatment options include: For newborns—a harness to keep the hip in place may be worn for 1-2 months
For babies aged 1-6 months:
Harness to reposition the hipManual adjustment and casting—the doctor moves bones into proper positions, and then places the baby in a lower body cast
For babies aged 6 months to 2 years:
Manual adjustment and castHip surgery, then body castFor children over 2 years: hip surgery, then body cast
If your baby was diagnosed with DDH at birth, the doctor may not treat the condition until the baby is older than 2 weeks. Early DDH may improve on its own.
The doctor will monitor the hip during follow-up exams and x-rays. This will be done until your child is done growing.
Because the exact cause is unknown, it is difficult to prevent DDH. If you are pregnant and have a family history of DDH, tell your doctor.
Avoiding certain swaddling positions may also help decrease some types of hip dislocation.
Developmental dysplasia of the hip. American Academy of Orthopedic Surgeons website. Available at:
http://orthoinfo.aaos.org/topic.cfm?topic=A00347. Updated October 2013. Accessed March 10, 2015.
Developmental dysplasia of the hip. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed. Updated January 21, 2015. Accessed March 10, 2015.
Hart ES, Albright MB, et al. Developmental dysplasia of the hip: nursing implications and anticipatory guidance for parents.
Shorter D, Hong T, et al. Screening programmes for developmental dysplasia of the hip in newborn infants.
Cochrane Database Syst Rev.
1/20/2015 DynaMed Systematic Literature Surveillance http://www.ebscohost.com/dynamed: American Academy of Orthopaedic Surgeons (AAOS). American Academy of Orthopaedic Surgeons clinical practice guideline on detection and nonoperative management of pediatric developmental dysplasia of the hip in infants up to six months of age. Rosemont (IL): American Academy of Orthopaedic Surgeons (AAOS); 2014 Sep 5. 368. Available at: http://www.guideline.gov/content.aspx?id=48516#Section420. Accessed March 10, 2015.
Last reviewed March 2015 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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