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Related Experiment Videos

Stress distribution in the superior labrum during throwing motion.

Ming-Long Yeh1, David Lintner, Zong-Ping Luo

  • 1Department of Orthopedic Surgery, Baylor College of Medicine, 6550 Fannin, Suite 451, Houston, TX 77030, USA.

The American Journal of Sports Medicine
|February 18, 2005
PubMed
Summary

Superior labrum anterior posterior (SLAP) lesions in athletes may result from high stress during the deceleration phase of throwing. Biceps origin and throwing phase significantly influence stress location within the labrum.

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Area of Science:

  • Biomechanics of sports injuries
  • Orthopedic research
  • Sports medicine

Background:

  • Superior labrum anterior posterior (SLAP) lesions are prevalent in overhead athletes.
  • Repetitive overhead activities can cause high stress on the biceps tendon insertion into the superior labrum.
  • The specific stress environment within the labrum during these activities remains under-investigated.

Purpose of the Study:

  • To investigate how biceps origin location and throwing phases influence stress distribution within the superior labrum.
  • To understand the biomechanical factors contributing to SLAP lesions.

Main Methods:

  • Development of 3D finite element models of the labrum-glenoid complex.
  • Simulation of different biceps origin locations (anterior, central, posterior).

Related Experiment Videos

  • Modeling of four pitching phases: early cocking, late cocking, acceleration, and deceleration.

    • Main Results:

    • The deceleration phase exhibited the highest stress magnitudes at the labrum-glenoid interface across all biceps origins.
    • Anatomical variations in biceps insertion primarily affected stress during deceleration.
    • Both biceps origin and throwing phase were critical in determining high-stress areas within the labrum.

    Conclusions:

    • The deceleration phase of throwing is a potential period for initiating superior labrum tears.
    • Findings enhance understanding of the localized origins of SLAP lesions.
    • This research provides biomechanical insights into SLAP lesion development.