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[Natural course of mild hip dysplasia from young childhood into adulthood]
1Orthopädische Universitätsklinik und schweizerisches Paraplegikerzentrum Balgrist, Zürich.
Insights
The acetabular index, crucial for evaluating pediatric hip development, showed limited prognostic value in predicting long-term hip health in mild developmental dysplasia of the hip. Long-term hip dynamics are essential for accurate assessment.
Area of Science:
- Pediatric Orthopedics
- Radiology
- Developmental Dysplasia of the Hip
Background:
- Hilgenreiner's acetabular index is a key parameter for assessing pediatric hip development.
- Mild developmental dysplasia of the hip (DDH) requires understanding its long-term prognosis.
- Radiometric evaluation plays a vital role in hip development assessment.
Purpose of the Study:
- To evaluate the prognostic value of the acetabular index in distinguishing healthy from pathologic hip joints.
- To assess the long-term outcomes of untreated, mildly dysplastic hips in children.
- To determine if the acetabular index can reliably predict future hip health.
Main Methods:
- Follow-up study of 48 pediatric hips initially classified as mildly dysplastic (age 1-4 years).
- Radiometric evaluation using Hilgenreiner's acetabular index.
- Longitudinal assessment of hip joint status into adulthood using established scoring systems (Tönnis, Ullmann, Wiberg).
Main Results:
- In adulthood, 90% of initially mildly dysplastic hips had normal Tönnis hip scores.
- 81% demonstrated a normal acetabular angle according to Ullmann.
- 71% showed normal acetabular coverage as per Wiberg's criteria.
Conclusions:
- The acetabular index alone has limited ability to clearly delineate healthy from pathologic hip joints in childhood.
- Long-term developmental dynamics of the hip are crucial for accurate prognostic assessment.
- Further consideration of hip development over extended periods is necessary for reliable diagnosis.
Abstract:
For radiometric evaluation of hip development in children, Hilgenreiner's acetabular index is one of the most important parameters. In order to assess the prognostic value of the acetabular index to separate healthy from pathologic hip joints, follow-up studies of untreated mildly dysplastic hips were undertaken. When 48 hips classified as mildly dysplastic at the age of 1-4 years were followed up when the patients were adult, 90% had normal hip scores according to Tönnis, 81% a normal acetabular angle according to Ullmann and 71% a normal acetabular coverage according to Wiberg. From the data presented there is no clear-cut delineation between healthy and pathologic hips during childhood. Therefore, the developmental dynamics of the hip during longer time intervals have to be taken into consideration.