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A biomechanical basis for tears of the human acetabular labrum
  1. C D Smith1,2,
  2. S Masouros1,2,
  3. A M Hill1,
  4. A A Amis2,3,
  5. A M J Bull1
  1. 1
    Department of Bioengineering, Imperial College London, London, UK
  2. 2
    Department of Mechanical Engineering, Imperial College London, London, UK
  3. 3
    Department of Musculoskeletal Surgery, Imperial College London, London, UK
  1. Correspondence to Mr C Smith, Imperial College London, Royal School of Mines, South Kensington Campus, London SW7 2AZ, UK; drcs1{at}doctors.net.uk

Abstract

Objective: Acetabular labral tears predominantly affect young patients and are a source of hip pain in the athlete. Four causes of the initiation of labral tears have been proposed; trauma, hypolaxity of the anterior capsule, dysplasia and bony impingement. A further cause could be reduced biomechanical properties in the area most susceptible to tears. However, no work has defined these properties.

Design: 32 compressive and 32 tensile test samples were harvested from fresh-frozen cadaveric acetabula. The labrum was divided into eight areas to allow comparison around its circumference. Semiconfined compressive testing and tensile testing were performed at a displacement rate of 10 mm/min in a controlled environment of 100% humidity at 37 (SD 1)°C.

Setting: Cadaveric study.

Results: The mean compressive stiffness was 31.75 (SD 16.7) MPa, and the mean tensile elastic modulus was 24.7 (SD 10.8) MPa. The anterosuperior region had a significantly lower compressive elastic modulus than either of the posterior quadrants (p<0.05) and a significantly lower tensile modulus to the anterioinferior area (p<0.05).

Conclusions: The biomechanical properties in the anterosuperior region may be a contributing factor to the initiation of labral tears.

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Footnotes

  • Competing interests None.

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