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Related Experiment Videos

Mechanical environment associated with rotator cuff tears

Z P Luo1, H C Hsu, J J Grabowski

  • 1Orthopedic Biomechanics Laboratory, Mayo Clinic/Mayo Foundation, Rochester, MN 55905, USA.

Journal of Shoulder and Elbow Surgery
|January 12, 1999
PubMed
Summary
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Subacromial impingement significantly increases stress in the supraspinatus tendon, potentially causing tears on any side. This finite element model reveals new insights into tendon injury mechanisms.

Area of Science:

  • Biomechanics
  • Orthopedics
  • Sports Medicine

Background:

  • The supraspinatus tendon is crucial for shoulder function.
  • Subacromial impingement is a common cause of shoulder pain and dysfunction.
  • Traditional models do not fully explain tear initiation in the supraspinatus tendon.

Purpose of the Study:

  • To investigate the stress distribution within the supraspinatus tendon under simulated subacromial impingement.
  • To evaluate the influence of humeroscapular elevation on tendon stress.
  • To compare stress patterns with and without impingement.

Main Methods:

  • A 2-dimensional finite element model of the supraspinatus tendon was developed.
  • Collagen fibers and extrafibrillar matrix were modeled using fiber-reinforced composite elements.

Related Experiment Videos

  • Simulations included humeroscapular elevation angles (0°, 30°, 60°) and two acromion conditions (no impingement, simulated impingement).

    • Main Results:

    • Subacromial impingement created significant stress concentrations in and around the critical zone of the supraspinatus tendon.
    • High stress and potential tears were observed on the bursal, articular, and within the tendon substance.
    • Impingement-induced stress patterns differed from those predicted by traditional mechanical models.

    Conclusions:

    • Subacromial impingement is an extrinsic mechanism that can initiate supraspinatus tendon tears.
    • The study highlights that impingement can lead to tears on multiple surfaces of the tendon, not just the bursal side.
    • Finite element analysis provides a more comprehensive understanding of impingement-related tendon pathology.