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Structure, strain and function of the transverse acetabular ligament
1Ludwig-Maximilians-Universität, Munich, Germany.
Acta Anatomica
|January 1, 1996
Summary
The transverse acetabular ligament (TAL) shows distinct ventral and dorsal attachments. During hip loading, the TAL experiences significant tensile strain, unlike the acetabular labrum.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The transverse acetabular ligament (TAL) is a key component of hip joint stability.
- Understanding TAL morphology and function is crucial for diagnosing and treating hip pathologies.
Purpose of the Study:
- To analyze the morphology, internal structure, and insertion sites of the TAL.
- To determine the strain experienced by the TAL under simulated hip joint loading conditions.
Main Methods:
- Microscopic analysis (polarized light microscopy, contact radiography) of TAL morphology in 15 human specimens.
- Mechanical testing of 6 specimens to measure TAL and labrum strain using strain gauges under varying loads.
- Determination of hip joint contact areas using polyether casting.
Main Results:
- Distinct ventral (fibrocartilaginous) and dorsal (periosteum/capsule continuity) TAL attachments were identified.
- Under loads up to 400% body weight, the TAL exhibited tensile strains up to 3.7%, significantly higher than the labrum (0.5%).
- Hip joint loading causes widening of the acetabular notch, placing the TAL under tension.
Conclusions:
- The TAL possesses unique structural characteristics at its ventral and dorsal attachments.
- The TAL plays a significant role in hip joint mechanics by accommodating acetabular notch widening and enduring tensile forces during loading.