Treatment for Mild Hip Dysplasia in Newborns

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00843258
Recruitment Status : Completed
First Posted : February 13, 2009
Last Update Posted : February 13, 2009
Information provided by:
University of Bergen

Brief Summary:
Developmental dysplasia of the hip is the most common musculoskeletal disorder in infancy, with a reported prevalence of 2% of all newborns. Although newborn screening programs based on clinical examination with Ortolani and Barlow tests were introduced in the 1950's and 1960's with early abduction splinting of the 2% testing positive, the prevalence of late cases warranting surgery has remained stable, around one per 1000. This has led to the introduction of ultrasound as an additional diagnostic tool, resulting in treatment rates of until 5-6%. This three fold increase in abduction splinting treatment is partly due to the initiation of treatment of infants in whom mild hip dysplasia but no hip instability has been identified. The benefit of early treatment of mild dysplasia in a hip that is neither dislocated nor dislocatable is unclear. Further, abduction splinting is not without risk, with avascular necrosis being reported in around 1%. The investigators conducted a masked, randomized, controlled trial to examine whether mildly dysplastic but stable or instable hips would benefit from early treatment, as compared to watchful waiting.

Condition or disease Intervention/treatment Phase
Developmental Dysplasia of the Hip Device: Abduction treatment Not Applicable

Detailed Description:

140 newborns with stable (not dislocatable or dislocated) but mildly dysplastic hips, born at the Maternity Hospital, Haukeland University Hospital, from 1997 onwards.

The newborns will be randomly assigned to one of two groups (number in sealed envelope, see flow chart). Because the newborns are recruited from a high risk group (60% with a positive family history and 35% breech), these risk factors are considered to be equally distributed in the two study groups. Stratification is therefore considered unnecessary.

For the controls, treatment will be started at age 1.5 months in cases of persistent dysplasia, i.e. a α-angle <50º, while treatment will be continued in the treatment group if the α-angle is ≤53º. At 3 months, treatment will be discontinued if the α-angle is ≥55º or started if α-angle is<55º. Treatment continued beyond 3 months will be discontinued when the AI is within two standard deviations according to the reference values from Tönnis and Brunken.

The study will require randomisation of 128 subjects into two equally sized groups to obtain 80% statistical power to detect a 3º difference of the α-angle. Less than 128 infants will be required to detect a similar difference in AI on radiography. To compensate for an expected rate of ineligibility and loss to follow-up of up to ten per cent, 140 patients will be enrolled.

PRACTICAL ISSUES The clinical hip-examinations will be performed at the maternity ward during day 1-3, by a physician with at least 2 years of pediatric experience. The hip joints will be classified as stable, unstable, dislocatable or dislocated. TM has the responsibility for the clinical re-examination prior to enrollement.

Ultrasound screening of newborns with increased risk for CDH is common practice at the maternity unit. Newborns eligible for the present study will be recruited from this high-risk group (about 13% of all newborns). To avoid inter-examination bias, all the ultrasound examinations will be performed by one examiner (KR), using a GE RT 3000, 5 MHz linear probe at KKB, and an ATL HDI 3000 machine with a 5 MHz linear probe or an Acuson 10XP, 5 MHz linear probe at the Section of Pediatric Radiology).

The ultrasound examinations will be performed according to a modified Graf procedure (Rosendahl), including both hip morphology and hip stability. Newborns with stable hips and a confirmed mild dysplasia on the second ultrasound examination will be re-examined clinically by TM, HR or TA prior to invitation to the study. After written informed consent has been given, the patient will attend the out patient clinic at BKB. A nurse will open the sealed envelope with a random number, and the newborn will enter the control or the treatment group. All data will be exported into SPSS by KR. RTL is the statistical adviser.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 140 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Immediate Treatment Compared With Active Sonographic Surveillance in the Management of Mild Hip Dysplasia in Newborn Infants: A Randomized, Controlled Trial
Study Start Date : February 1998
Actual Primary Completion Date : April 2003
Actual Study Completion Date : April 2003

Arm Intervention/treatment
No Intervention: Active Sonographic surveillance
Follow-up at 1.5 and 3 months (Ultrasound,Clinical examination), at 6 and 12 months (clinical examination, pelvic X-ray)
Experimental: Abduction treatment
Treatment (abduction splint) from 0-6 weeks, follow-up at 1.5 and 3 months (clinical examination and ultrasound) and at 6 and 12 months (clinical examination and pelvic x-ray)
Device: Abduction treatment
Abduction treatment with a Frejka's pillow for 6 weeks
Other Name: Pavlik harness

Primary Outcome Measures :
  1. The acetabular index (AI), assessed from anterior-posterior pelvic radiographs obtained according to a standardized protocol at age 12 months [ Time Frame: 12 months ]

Secondary Outcome Measures :
  1. We also report the proportion of children requiring treatment in the first year of life and its duration, and the proportion of children in each group with radiological ossification delay or dysplasia at one year of age. [ Time Frame: 12 months ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   up to 5 Days   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Birth weight > 2500 g
  • Mild hip dysplasia on ultrasound day 1-2
  • Written informed consent given

Exclusion Criteria:

  • Birth weight less than 2500 g and/or severe congenital malformation(s)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00843258

Sponsors and Collaborators
University of Bergen
Principal Investigator: Karen Rosendahl, PhD Institute of Surgical Sciences, University of Bergen

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: University of Bergen, Institute of SUrgical Sciences Identifier: NCT00843258     History of Changes
Other Study ID Numbers: Mild hip dysplasia
First Posted: February 13, 2009    Key Record Dates
Last Update Posted: February 13, 2009
Last Verified: February 2009

Keywords provided by University of Bergen:
mild dysplasia

Additional relevant MeSH terms:
Hip Dislocation
Hip Dislocation, Congenital
Pathologic Processes
Joint Dislocations
Bone Diseases
Musculoskeletal Diseases
Wounds and Injuries
Hip Injuries
Musculoskeletal Abnormalities
Congenital Abnormalities