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Related Experiment Videos

Effects of ankle joint effusion on lower leg function.

J Ty Hopkins1, Riann Palmieri

  • 1Department of Physical Education, Brigham Young University, Provo, UT 84602-2070, USA. tyhopkins@byu.edu

Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine
|January 9, 2004
PubMed
Summary

Ankle edema, or swelling, significantly reduces peroneal muscle activity and ankle torque, increasing injury risk. This neuromuscular deficit highlights the need for targeted rehabilitation strategies after ankle sprains.

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Neuromuscular Physiology

Background:

  • Ankle sprains are common sports injuries.
  • Edema (swelling) after injury can impair dynamic joint stabilization.
  • Understanding sensorimotor response to ankle edema is crucial for preventing re-injury.

Purpose of the Study:

  • Quantify muscle activation (peroneal, tibialis anterior, soleus) after induced ankle effusion.
  • Determine changes in ankle joint peak torque, peak power, and RMS power.
  • Assess neuromuscular response during a closed kinetic chain activity.

Main Methods:

  • 20 healthy volunteers underwent induced ankle effusion.
  • Surface EMG recorded peroneal longus (PL), tibialis anterior (TA), and soleus (Sol) activity.

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  • Ankle torque and power measured using a closed-chain dynamometer at baseline, immediately post-effusion, and 30 minutes later.

    • Main Results:

    • Significant time x group interaction found for EMG and kinetic variables.
    • Peroneus longus (PL) EMG decreased immediately and remained depressed post-effusion.
    • Ankle plantarflexion torque decreased immediately after effusion; no changes in TA or Sol activity.

    Conclusions:

    • Induced ankle edema leads to reduced peroneal muscle activation and ankle torque.
    • These neuromuscular deficits may increase susceptibility to further ankle injuries.
    • Findings underscore the importance of addressing edema in ankle sprain rehabilitation.