Development of the acetabulum and hip: computed tomography analysis of the axial plane

Area of Science:

• Pediatric Orthopedics
• Radiology
• Developmental Biology

Background:

• Acetabular development is crucial for hip joint stability.
• Understanding normal acetabular growth aids in identifying developmental hip abnormalities.
• Computed tomography (CT) provides detailed three-dimensional imaging of skeletal structures.

Purpose of the Study:

• To evaluate the axial plane growth and development of the acetabulum in children.
• To establish normative values for key acetabular parameters during childhood and adolescence.
• To correlate acetabular development with age and skeletal maturity.

Main Methods:

• Retrospective analysis of 170 normal hip CT scans from children aged 6 months to 17 years.
• Measurement of axial acetabular index, anterior and posterior center-edge angles (CEA), and acetabular anteversion.
• Assessment of triradiate cartilage closure timing in relation to acetabular development.

Main Results:

• The acetabulum deepens and becomes more spherical until approximately 13 years of age.
• Triradiate cartilage closure occurs between 11 and 13 years, slightly earlier in girls.
• Posterior femoral head coverage consistently exceeds anterior coverage; acetabular anteversion remains relatively stable.
• Significant changes in acetabular shape cease after triradiate cartilage closure.

Conclusions:

• Normal axial acetabular development follows a predictable pattern, characterized by increasing depth and sphericity until skeletal maturity.
• Established normative data for axial acetabular parameters are essential for accurate diagnosis of hip pathologies.
• This study provides a foundation for improved 3D understanding of hip conditions and informs treatment strategies.