Related Experiment Videos

Development of the acetabulum and the acetabular labrum in the normal child: analysis with radial-sequence magnetic

Motoyuki Horii1, Toshikazu Kubo, Yudo Hachiya

  • 1Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan. horii@koto.kpu-m.ac.jp

Journal of Pediatric Orthopedics
|February 22, 2002
PubMed

Insights

Acetabular and labral coverage of the femoral head differs in children compared to adults. While acetabular coverage is less in young children, overall coverage including the labrum is greater, indicating developmental differences.

Area of Science:

  • Pediatric Orthopedics
  • Radiology
  • Developmental Anatomy

Background:

  • Acetabular and labral coverage are crucial for hip joint stability.
  • Understanding developmental changes in hip coverage is essential for identifying potential pathologies.

Purpose of the Study:

  • To quantify acetabular and labral coverage in children across different age groups and hip positions.
  • To compare hip coverage in children with healthy adults.

Main Methods:

  • Radial-sequence magnetic resonance imaging (MRI) was used to scan 40 hips in 20 children (aged 6-13 years) and 19 hips in 10 healthy adults.
  • Coverage was measured at seven positions around the femoral head at 15-degree intervals.
  • Measurements included acetabular coverage, labral coverage, and combined coverage.

Main Results:

  • Children exhibited less acetabular coverage than adults across all measured positions.
  • Total hip coverage, including the acetabular labrum, was greater in children than in adults.
  • Developmental variations in acetabular and labral coverage were observed depending on the hip position.

Conclusions:

  • Acetabular and labral development significantly influences hip joint coverage in children.
  • These findings highlight age- and position-dependent changes in hip morphology, important for clinical assessment.

Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...