Document Detail

Relationship between knee joint laxity and knee joint mechanics during the menstrual cycle.
MedLine Citation:
PMID:  18728055     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: An increase in knee laxity during the menstrual cycle may increase the risk of anterior cruciate ligament injury.
OBJECTIVE: To investigate whether changing knee laxity during the menstrual cycle correlates with changing knee joint loads in a cutting manoeuvre.
DESIGN: Cross-sectional study.
SETTING: Laboratory testing.
PARTICIPANTS: 25 healthy women, with a normal menstrual cycle, no history of oral contraceptive use, and no previous knee injury
INTERVENTIONS: Serum hormone concentrations were assessed and knee joint laxity at a load of 89 N was measured during the follicular, ovulation and luteal phases. Participants performed 10 trials of a cutting manoeuvre to quantify knee joint mechanics at each test session.
MAIN OUTCOME MEASUREMENTS: Knee joint laxity (mm), peak knee angle ( degrees ) and knee joint moment (Nm) and knee joint impulse (Nms).
RESULTS: Increased knee laxity was observed during ovulation compared with the luteal phase, but no significant changes in knee mechanics corresponding to menstrual phases were found. A positive correlation was found between changes in knee laxity and changes in knee joint loads (Deltamoment or Deltaimpulse) from the follicular phase to ovulation, and from ovulation to the luteal phase (p<0.05). Women in whom knee laxity increased showed increased knee loads, and those in whom knee laxity decreased showed decreased knee loads during the menstrual cycle.
CONCLUSIONS: Knee laxity correlates positively with knee joint loads, and increased knee laxity during the menstrual cycle may be a potential risk factor for anterior cruciate ligament injuries in certain women during sports activity.
S-K Park; D J Stefanyshyn; B Ramage; D A Hart; J L Ronsky
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-26
Journal Detail:
Title:  British journal of sports medicine     Volume:  43     ISSN:  1473-0480     ISO Abbreviation:  Br J Sports Med     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-03-09     Completed Date:  2009-11-05     Revised Date:  2014-07-30    
Medline Journal Info:
Nlm Unique ID:  0432520     Medline TA:  Br J Sports Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  174-9     Citation Subset:  IM    
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MeSH Terms
Anterior Cruciate Ligament / injuries*,  physiopathology
Athletic Injuries / etiology*,  physiopathology
Cross-Sectional Studies
Exercise Test
Follicular Phase / physiology
Joint Instability / etiology*,  physiopathology
Knee Injuries / etiology*,  physiopathology
Luteal Phase / physiology
Menstrual Cycle / physiology*
Ovulation / physiology
Range of Motion, Articular
Risk Factors
Sex Factors
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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