title: Multiplanar Knee Laxity and Perceived Function During Activities of Daily Living and Sport.
abstract: BACKGROUND
  Greater knee-joint laxity may lead to a higher risk of knee injury, yet it is unknown whether results of self-reported outcome measures are associated with distinct knee-laxity profiles.
  
  
  OBJECTIVE
  To identify the extent to which multiplanar knee laxity is associated with patient-reported outcomes of knee function in healthy individuals during activities of daily living and sport.
  
  
  METHODS
  Descriptive laboratory study.
  
  
  METHODS
  University research laboratory.
  
  
  METHODS
  Forty healthy individuals (20 men, 20 women; age = 18-31 years).
  
  
  METHODS
  All participants were given the Knee Outcome Survey Activities of Daily Living Scale (KOS-ADL) and Sports Activities Scale (KOS-SAS) and subsequently measured for knee laxity in the sagittal, frontal, and transverse planes. Separate backward stepwise regression analyses were performed to determine the extent to which multiplanar knee-laxity values predicted KOS-ADL and KOS-SAS scores within each sex.
  
  
  RESULTS
  Women had higher magnitudes of anterior, posterior (POST(LAX)), varus (VAR(LAX)), valgus (VAL(LAX)), and internal-rotation laxity than men and trended toward greater external rotation (ER(LAX)) laxity. Greater POST(LAX), less VAL(LAX), and greater VAR(LAX) was associated with lower KOS-ADL scores (KOS-ADL = -4.8 [POST(LAX)], + 3.3 [VAL(LAX)] - 2.2 [VAR(LAX)] + 100.4, R2 = 0.74, P < .001) and greater POST(LAX) and less VAL(LAX) was associated with lower KOS-SAS scores (KOS-SAS = -8.2 [POST(LAX)], + 3.6 [VAL(LAX)] + 96.4, R2 = 0.67, P < .001) in women. In men, greater POST(LAX) and less ER(LAX) was associated with lower KOS-SAS scores (KOS-ADL = -4.7 [POST(LAX)], + 0.9 [ER(LAX)] + 96.4, R2 = 0.49, P < .001).
  
  
  CONCLUSIONS
  The combination of POST(LAX) with less relative VAL(LAX) (women) or less relative ER(LAX) (men) was a strong predictor of KOS scores, suggesting that a self-reported outcome measure may be beneficial as part of a preparticipation screening battery to identify those with perceived functional deficits associated with their knee laxity.
authors.affiliation: Department of Physical Therapy, High Point University, NC;
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Taylor
authors.affiliation: Department of Kinesiology, University of North Carolina at Greensboro.
authors.forename: Hsin-Min
authors.initials: HM
authors.lastname: Wang
authors.affiliation: Department of Kinesiology, University of North Carolina at Greensboro.
authors.forename: Randy J
authors.initials: RJ
authors.lastname: Schmitz
authors.affiliation: Department of Kinesiology, University of North Carolina at Greensboro.
authors.forename: Christopher K
authors.initials: CK
authors.lastname: Rhea
authors.affiliation: Department of Kinesiology, University of North Carolina at Greensboro.
authors.forename: Scott E
authors.initials: SE
authors.lastname: Ross
authors.affiliation: Department of Kinesiology, University of North Carolina at Greensboro.
authors.forename: Sandra J
authors.initials: SJ
authors.lastname: Shultz
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000503:physiopathology* / Q000523:psychology / Q000534:rehabilitation; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000523:psychology; D007718:Knee Injuries / Q000503:physiopathology* / Q000523:psychology; D007719:Knee Joint / Q000503:physiopathology; D008297:Male; D010465:Perception; D012399:Rotation; D057566:Self Report; D013177:Sports / Q000523:psychology; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D055815:Young Adult
keywords: Knee Outcome Survey; functional deficits; knee injury