CoChat
Sign Up
Cited by 239Knee injuries and reconstruction techniquesSports injuries and preventionLower Extremity Biomechanics and Pathologies

Injuries to Knee Ligaments: Relationship to Looseness and Tightness in Football Players

Nicholas, James A.·1970·JAMA
DOI 10.1001/jama.1970.03170260032007
Open this paper in CoChat — free account

Abstract

With tests to determine the mobility of lower and upper extremities, 139 professional football players were classified as loose or tight, and subsequently checked for the incidence of major knee ligament rupture. Thirty-seven players sustained knee ligament rupture requiring surgery. Thirty-nine players had at least three indices of looseness. Twenty-eight (72%) of these ruptured their knee ligaments. Of the remaining 100 players with two or less indices, nine (9%) ruptured their ligaments. Only two (4%) players in the tight category (no indices of looseness) ruptured their ligaments. Increased likelihood of knee ligament rupture was found with increased looseness. Specific exercises should be designed to increase the strength of loose players and the mobility of tight players. By proper screening, it may be possible to reduce potential disabling knee ligament rupture in loose players in contact sports and in high velocity athletics.

Integrity signals

Registry

Crossref · 10.1001/jama.1970.03170260032007

Cites

2 of 2 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Related

Authors
Nicholas, J. A.
Corresponding author
Nicholas, James A.
Venue
JAMA
Publisher
American Medical Association (AMA)
Published
1970-06-29
Volume
212
Issue
13
Pages
2236
ISSN
  • 0002-9955 (ISSN-L)
  • 0098-7484
DOI
10.1001/jama.1970.03170260032007
OpenAlex
W2094568837
Cited by
239
References
2
Citations by year
2025: 1 · 2024: 1 · 2023: 3 · 2022: 2 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 4 · 2016: 3 · 2013: 1 · 2012: 4
FWCI
6.04
Type
journal article
Language
en
Open access
closed
Locations
  • JAMA (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Knee injuries and reconstruction techniques
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports injuries and prevention
  • Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
Keywords
knee ligament rupture, ligament injury, joint laxity, joint mobility, professional football players, injury risk factors, screening, resistance training, contact sports injuries
MeSH terms
Anterior Cruciate Ligament Injuries, Humans, Knee Injuries, Anterior Cruciate Ligament, Posterior Cruciate Ligament

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review