Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Knee joint forces during isokinetic knee extensions: a case study.

J W Chow1

  • 1Department of Kinesiology, University of Illinois at Urbana-Champaign, Urbana, USA. j-chow1@uiuc.edu

Clinical Biomechanics (Bristol, Avon)
|October 16, 1999
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Variability, frequency composition, and complexity of submaximal isometric knee extension force from subacute to chronic stroke.

Neuroscience·2014
Same author

Persons with reconstructed ACL exhibit altered knee mechanics during high-speed maneuvers.

International journal of sports medicine·2014
Same author

Impaired force steadiness is associated with changes in force frequency composition in subacute stroke.

Neuroscience·2013
Same author

Lower trunk muscle activity during the tennis serve.

Journal of science and medicine in sport·2004
Same author

Effect of ball size on player reaction and racket acceleration during the tennis volley.

Journal of science and medicine in sport·2003
Same author

Molecular characterization of gentamicin-resistant Enterococci in the United States: evidence of spread from animals to humans through food.

Journal of clinical microbiology·2003

Knee joint forces during isokinetic knee extensions decrease with higher speeds. This study outlines procedures for measuring these forces, offering insights for rehabilitation strategies in knee dysfunction patients.

Area of Science:

  • Biomechanics of human movement
  • Musculoskeletal system analysis
  • Sports medicine and rehabilitation

Background:

  • Previous research on knee joint forces during isokinetic knee extensions yielded inconsistent findings.
  • Prior studies utilized lower speeds (up to 180°/s) than modern isokinetic dynamometers allow.

Observation:

  • A single female subject performed maximal effort isokinetic knee extensions across 16 speeds (25–400°/s).
  • Knee joint geometry was determined via radiographs.
  • Resultant knee torque was calculated, incorporating gravitational and inertial effects.

Findings:

  • All measured knee joint forces, including patellar ligament and quadriceps tendon forces, decreased as isokinetic speed increased.
  • Tibiofemoral shear forces indicated consistent loading of the anterior cruciate ligament throughout the motion.

Related Experiment Videos

  • The magnitude of knee joint forces was found to be highly dependent on knee torque values.

    • Implications:

    • Isokinetic knee extensions are suitable for early-stage rehabilitation of knee dysfunction due to lower coordination demands.
    • To minimize knee joint forces, clinicians should recommend submaximal efforts at lower speeds or maximal efforts at higher speeds during rehabilitation.