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Imaging of the Microstructural Failure Mechanism in the Human Hip
Published on: September 29, 2023
Strains across the acetabular labrum during hip motion: a cadaveric model
Marc R Safran1, Giovanni Giordano, Derek P Lindsey
1Department of Orthopaedic Surgery, Stanford University, 450 Broadway Street, M/C 6342, Redwood City, CA 94063, USA. msafran@stanford.edu
The American Journal of Sports Medicine
|June 29, 2011
Summary
This study measured hip labrum strains during various movements. While the posterior labrum experienced the most strain, clinical tears often occur anteriorly, suggesting complex injury mechanisms.
Area of Science:
- Orthopedic biomechanics
- Hip joint anatomy
- Musculoskeletal research
Background:
- Acetabular labral tears cause significant hip pain and are often treated with arthroscopy.
- The precise function and biomechanical role of the hip labrum remain incompletely understood.
- Understanding labral function is crucial for effective treatment and injury prevention.
Purpose of the Study:
- To quantify circumferential strains across the entire hip labrum in various positions.
- To correlate specific hip movements with strain patterns in different labral regions.
- To provide insights into the mechanisms of acetabular labral tears.
Main Methods:
- A descriptive laboratory study utilizing twelve cadaveric hip specimens.
- Circumferential strains were measured in anterior, anterolateral, lateral, and posterior labral regions using differential variable reluctance transducers.
- Hips were subjected to 36 different positions to simulate a range of motion.
Main Results:
- The posterior labrum exhibited the highest circumferential strains, particularly in flexion with adduction or neutral abduction-adduction.
- Anterior labral strains were greatest during flexion with adduction.
- Anterolateral labral strains peaked in full extension, and external rotation generally increased strains compared to neutral or internal rotation.
Conclusions:
- This study provides the first comprehensive data on circumferential strain distribution across the entire hip labrum.
- Observed strain patterns, especially increased anterolateral strain in the impingement test position, align with clinical findings of anterior labral tears.
- While the posterior labrum shows the highest strain magnitude, clinical tear locations suggest multifactorial causes, potentially involving factors beyond passive motion strains.
