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Related Experiment Videos

Muscle activity during shoulder dislocation.

L A Broström1, M Kronberg, G Nemeth

  • 1Department of Orthopedics, Karolinska Hospital, Stockholm, Sweden.

Acta Orthopaedica Scandinavica
|December 1, 1989
PubMed
Summary
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Patients with generalized joint laxity experienced shoulder instability during external rotation. Low and slow subscapularis muscle activation may be a contributing factor to this instability.

Area of Science:

  • Orthopedics
  • Biomechanics
  • Sports Medicine

Background:

  • Generalized joint laxity is a condition characterized by excessive range of motion in joints.
  • Shoulder instability, including dislocation and subluxation, can significantly impact function and quality of life.

Purpose of the Study:

  • To investigate the electromyographic (EMG) activity of shoulder muscles during external rotation in patients with generalized joint laxity.
  • To explore the relationship between muscle activation patterns and the occurrence of humeroscapular instability.

Main Methods:

  • EMG activity was recorded from eight shoulder muscles in four patients diagnosed with generalized joint laxity.
  • Patients underwent external rotation of the humerus at 45 degrees of abduction while muscle activity was monitored.

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Main Results:

  • Two patients experienced humeroscapular dislocation, while the other two had subluxation during the tested movement.
  • Electromyography revealed low activity levels and delayed activation speed in the subscapularis muscle of the affected patients.

Conclusions:

  • The findings suggest that reduced subscapularis muscle activity and delayed activation may predispose individuals with generalized joint laxity to shoulder instability.
  • This highlights the potential role of specific muscle dysfunction in the pathophysiology of shoulder instability in this patient population.