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[Electromyographic study associated with rotator cuff tears].

S Kawamoto

    Nihon Seikeigeka Gakkai Zasshi
    |December 1, 1986
    PubMed
    Summary
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    Rotator cuff tears impair shoulder muscle coordination, affecting arm movement. Electromyogram (EMG) analysis revealed distinct muscle activity patterns in affected shoulders, which improved after surgery, clarifying scapulohumeral rhythm.

    Area of Science:

    • Orthopedics
    • Neurology
    • Biomechanics

    Context:

    • Rotator cuff tears are common injuries affecting shoulder function.
    • Understanding the pathophysiological mechanisms is crucial for effective treatment.
    • Electromyography (EMG) provides insights into muscle electrical activity during movement.

    Purpose:

    • To investigate the electromyogram (EMG) patterns of shoulder girdle muscles during arm elevation in patients with rotator cuff tears.
    • To correlate muscle action potentials with arm angles to identify specific EMG patterns associated with rotator cuff pathology.
    • To elucidate the impact of rotator cuff tears on scapulohumeral rhythm and muscular coordination.

    Summary:

    • Electromyogram (EMG) analysis of 23 patients with rotator cuff tears was performed during arm elevation.

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  • Distinct EMG differences were observed in the trapezius, deltoideus, and supraspinatus muscles between affected and sound shoulders, particularly when arm elevation was limited.
  • These EMG differences normalized in patients who regained shoulder mobility above 90 degrees post-surgery, suggesting impaired muscular coordination due to restricted joint motion.

    • Impact:

    • The study clarifies how rotator cuff tears disrupt the coordinated activity of shoulder muscles.
    • Findings enhance the understanding of scapulohumeral rhythm alterations in rotator cuff pathology.
    • Provides a basis for using EMG to assess functional recovery and guide rehabilitation after rotator cuff surgery.