Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2005) 04, 1 - 8

Research article
The Effects of Knee Joint Effusion on Quadriceps Electromyography During Jogging
Michael R. Torry1, , Michael J. Decker1, Peter J. Millett3, J. Richard Steadman2, William I. Sterett2
Author Information
1 Biomechanics Research Lab., Steadman"Hawkins Research Foundation Vail, Colorado, USA
2 Steadman Hawkins Sports Medicine Clinic, Vail, Colorado USA
3 Department of Orthopedics, Brigham and Women’s Hospital, Harvard University, Boston, MA, USA

Michael R. Torry
✉ Director, Biomechanics Research Laboratory, Steadman Hawkins Sports Medicine Foundation, 181 West Meadow Drive, Ste 1000, Vail, Colorado 81657, USA
Publish Date
Received: 26-10-2004
Accepted: 30-11-2004
Published (online): 01-03-2005
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To investigate and describe the influence of intra-articular effusion on knee joint kinematics and electromyographic (EMG) profiles during jogging. Thirteen individuals underwent a 20 cc 0.9% saline insufflation of the knee joint capsule and completed 8 jogging trials. Stance phase, sagittal plane knee joint kinematics and thigh muscular EMG profiles were compared pre- and post-insufflation utilizing a paired t-test ( = 0.05). Mild knee effusion caused a reduction in vastus medialis (p = 0.005) and lateralis (p = 0.006) EMG activity. The rectus femoris, biceps femoris and medial hamstring muscles did not exhibit changes due to this protocol. There were no changes in the sagittal plane knee joint kinematic pattern. Twenty cc effusion can cause quadriceps inhibition in the vastus medialis and the vastus lateralis in otherwise healthy individuals during jogging. This study provides baseline data for the effects of mild knee joint effusion on thigh musculature during jogging.

Key words: Electromyography (EMG), kinematics, jogging, muscle inhibition, knee

           Key Points
  • 20 cc of knee effusion can cause vastus medialis and lateralis inhibition as noted by decreases in EMG amplitude.
  • This effusion does not appear to alter sagittal plane knee joint kinematics during jogging.
  • This finding if different from previous work investigating knee joint kinematic changes during a less dynamic activity (gait) with 20 cc of effusion.
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