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Neuromuscular function after arthroscopic partial meniscectomy.

Julia F Glatthorn1, Andreas M Berendts, Mario Bizzini

  • 1Neuromuscular Research Laboratory, Schulthess Clinic, Lengghalde 2, 8008 Zurich, Switzerland.

Clinical Orthopaedics and Related Research
|November 26, 2009
PubMed
Summary

Quadriceps muscle weakness persists six months after arthroscopic partial meniscectomy, likely due to neural impairments affecting maximal strength. Muscle control at lower force levels remains unaffected.

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Area of Science:

  • Orthopedics
  • Neuromuscular Physiology
  • Sports Medicine

Background:

  • Quadriceps muscle weakness is a known issue after arthroscopic partial meniscectomy, impacting knee function and stability.
  • The underlying neuromuscular alterations contributing to persistent muscle weakness post-meniscectomy are not fully understood.

Purpose of the Study:

  • To evaluate side-to-side differences in quadriceps strength 6 months post-arthroscopic partial meniscectomy.
  • To identify the physiological basis (neural vs. muscular) of quadriceps weakness.
  • To determine the effect of quadriceps weakness on muscle control during submaximal contractions.

Main Methods:

  • 14 participants (average age 44) underwent testing 6 months after unilateral medial arthroscopic partial meniscectomy.
  • Maximal voluntary strength and muscle activation (EMG) were measured during isometric, concentric, and eccentric contractions.

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  • Vastus lateralis muscle size and architecture were assessed via ultrasonography; muscle control was evaluated using repositioning and tracking tasks.

    • Main Results:

    • Lower isometric and concentric quadriceps strength and vastus lateralis EMG activity were observed on the operated side compared to the non-operated side.
    • No significant differences were found in muscle architecture or muscle control between the involved and uninvolved limbs.

    Conclusions:

    • Quadriceps weakness is evident 6 months after arthroscopic partial meniscectomy.
    • Electromyography (EMG) findings suggest neural impairments, specifically activation failure, contribute to this weakness.
    • These neural deficits impact maximal force output but do not appear to affect muscle control at submaximal levels.