The labrum acetabulare in infants

Area of Science:

• Orthopedics
• Developmental Biology
• Radiology

Background:

• Knowledge of hip joint embryology, especially the acetabular labrum's development, is essential for understanding hip dysplasia and dislocations.
• Distinguishing between "teratologic" luxations (fetal damage) and "developing deformations" is critical for accurate diagnosis and treatment.

Purpose of the Study:

• To clarify the morphologic relationships of the acetabular labrum in centered and decentered hip joints using modern imaging techniques.
• To establish clear and consistent terminology for the acetabular roof cartilage, differentiating between the "acetabular labrum" and "hyalin-preformed cartilaginous acetabular roof."

Main Methods:

• Utilized advanced imaging techniques, specifically sonography and Magnetic Resonance Imaging (MRI).
• Visualized the acetabular labrum's tip, base, and their relationship with the acetabular roof cartilage during hip decentering.

Main Results:

• Modern imaging techniques successfully clarified the morphologic relationships of the acetabular labrum in both centered and decentered hip joints.
• Sonography clearly visualized changes in the labrum and its relation to the acetabular roof during the process of hip decentering.
• Identified the need to avoid the term "limbus" and use precise terms like "acetabular labrum" and "hyalin-preformed cartilaginous acetabular roof."

Conclusions:

• A clear understanding of hip joint embryology and labral development is fundamental for diagnosing hip pathologies.
• Consistent terminology is vital for accurately describing morphologic changes in decentered hips.
• Further basic research is necessary to understand the acetabular labrum's size, shape, vascularity, and potential micro-damage from treatments.