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Related Experiment Videos

Superior labral strain during the throwing motion. A cadaveric study.

R L Pradhan1, E Itoi, Y Hatakeyama

  • 1Department of Orthopedic Surgery, Akita University School of Medicine, Japan.

The American Journal of Sports Medicine
|July 31, 2001
PubMed
Summary
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Pitching motions significantly increase strain on the superior labrum, particularly the posterior portion during late cocking. This labral strain may contribute to biceps-related injuries in athletes.

Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Biomechanics

Background:

  • The superior labrum is vulnerable to injury during overhead athletic activities.
  • Pitching involves repetitive, high-stress movements that can strain shoulder structures.

Purpose of the Study:

  • To quantify strain on the anterior and posterior superior labrum during simulated pitching motions.
  • To identify specific pitching phases that induce significant labral strain.

Main Methods:

  • Utilized 10 fresh-frozen cadaveric shoulders.
  • Measured superior labral strain using linear transducers in simulated pitching phases.
  • Applied loads to the long head of the biceps tendon.

Main Results:

Related Experiment Videos

  • Statistically significant strain increase in both anterior and posterior superior labrum during late cocking.
  • Posterior superior labrum experienced significantly greater strain than the anterior portion.
  • Maximal external rotation during late cocking correlated with peak strain.

    • Conclusions:

    • The late cocking phase of pitching places significant strain on the superior labrum.
    • Increased posterior labral strain may be linked to the biceps tendon's anatomical orientation.
    • This strain could predispose athletes to labral detachment injuries.