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 flexor-extensor strength in children

R C Henderson1, C L Howes, K L Erickson

  • 1University of North Carolina at Chapel Hill 27599-7055.

The Journal of Orthopaedic and Sports Physical Therapy
|October 1, 1993
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

Long-term clinical outcomes following surgery for spontaneous pneumothorax caused by pulmonary blebs and bullae in dogs - a multicentre (AVSTS Research Cooperative) retrospective study.

The Journal of small animal practice·2020
Same author

Withanolide E sensitizes renal carcinoma cells to TRAIL-induced apoptosis by increasing cFLIP degradation.

Cell death & disease·2015
Same author

Viewpoint survey of mental health service users' experiences of discrimination in England 2008-2012.

Social psychiatry and psychiatric epidemiology·2014
Same author

The hinged back plate mechanism in glassy wax tests of New Zealand male soft scale insects (Hemiptera: Coccoidea: Coccidae).

Arthropod structure & development·2007
Same author

Circulating levels of MCP-1 and IL-8 are elevated in human obese subjects and associated with obesity-related parameters.

International journal of obesity (2005)·2006
Same author

Bone health in Duchenne muscular dystrophy: a workshop report from the meeting in Cincinnati, Ohio, July 8, 2004.

Neuromuscular disorders : NMD·2005
Same journal

Perplexing Pubic Pain: How Clinicians Might Approach Assessing and Managing Pubic-Related Groin Pain in Athletes.

The Journal of orthopaedic and sports physical therapy·2026
Same journal

Prevalence of Symphyseal Radiographic Findings and Skeletal Maturity and Their Relationship With Groin Symptoms in PROfessional FEmale Football Players: A Multicenter Cohort Study.

The Journal of orthopaedic and sports physical therapy·2026
Same journal

Rehabilitation of Long-Standing Groin Pain in Athletes: A Scoping Review of Exercise Content and Reporting.

The Journal of orthopaedic and sports physical therapy·2026
Same journal

Could Hip Dysplasia Be the Problem?

The Journal of orthopaedic and sports physical therapy·2026
Same journal

Understanding Adult Hip Dysplasia: Clinical Presentation, Assessment Techniques, and Exercise-Driven Management Strategies.

The Journal of orthopaedic and sports physical therapy·2026
Same journal

Hip Muscle Strength Is Associated With Symptom Severity in People With Femoroacetabular Impingement Syndrome, but Only in Those With Preexisting Hip Muscle Weakness: A Secondary Analysis of Baseline Data From a Randomized Controlled Trial.

The Journal of orthopaedic and sports physical therapy·2026
See all related articles

Normal side-to-side knee strength differences in children vary based on strength levels. Lower peak torque in children shows greater variability, impacting clinical strength assessments.

Area of Science:

  • Pediatric Orthopedics
  • Sports Medicine
  • Biomechanics

Background:

  • Isokinetic testing quantifies knee flexion-extension strength in children and adolescents.
  • Clinical evaluations often compare the affected limb to the unaffected limb.
  • Understanding normal side-to-side strength differences is crucial for accurate interpretation.

Purpose of the Study:

  • To determine normal side-to-side peak torque differences in the knee flexor and extensor muscles of healthy children and adolescents.
  • To assess how strength levels influence these side-to-side differences.
  • To provide normative data for clinical use.

Main Methods:

  • Twenty-one healthy children (ages 6-16) underwent isokinetic dynamometry (Cybex II).
  • Measurements were taken at knee angular velocities of 90 and 240 degrees/sec.

Related Experiment Videos

  • Peak torque was recorded for knee flexion and extension.

    • Main Results:

    • Children with peak torque >50 ft-lbs exhibited average side-to-side differences of 11% +/- 12%.
    • Children with peak torque <50 ft-lbs showed greater variability, with average differences of 22% +/- 19%.
    • Using the mean of multiple repetitions reduced variability compared to single peak values.

    Conclusions:

    • Side-to-side knee strength variability in children is influenced by absolute strength levels.
    • Clinicians should consider these normative side-to-side differences when evaluating pediatric patients.
    • Strength assessment protocols may benefit from using mean torque values for improved reliability.