PMID- 10063808
OWN - NLM
STAT- MEDLINE
DCOM- 19990527
LR  - 20220409
IS  - 0195-9131 (Print)
IS  - 0195-9131 (Linking)
VI  - 31
IP  - 2
DP  - 1999 Feb
TI  - Laxity, instability, and functional outcome after ACL injury: copers versus 
      noncopers.
PG  - 210-5
AB  - PURPOSE: The purpose of this study was to determine the relationship among 
      laxity, quadriceps strength, instability, and function in subjects with complete 
      rupture of the anterior cruciate ligament (ACL) who compensate well for the 
      injury (copers) and those who require surgical stabilization (noncopers). 
      METHODS: Forty-five patients with unilateral ACL rupture (confirmed via 
      arthroscopy or magnetic resonance imaging (MRI) and arthrometer measurements) 
      participated in this study. Subjects were divided into two groups: copers (N = 
      12), and subacute noncopers (N = 18) and chronic noncopers (N = 15). All copers 
      had returned to all preinjury activity (including index sport) without 
      limitation. Maximum manual anterior tibiofemoral laxity measurements, quadriceps 
      femoris muscle strength measurements, and a series of hop tests were performed. 
      Lysholm Scale, Knee Outcome Survey (KOS), global rating of knee function, and the 
      International Knee Documentation Committee (IKDC) form were completed. RESULTS: 
      There was no significant difference in laxity between copers (X = 5.5+/-2.7 mm) 
      and noncopers (chronic, X = 5.1+/-2.8 mm and subacute, X = 4.2+/-2.2 mm) or in 
      IKDC scores among the groups. The copers, however, scored significantly better 
      than the chronic and subacute ACL-deficient subsets on all other measures. 
      Measurements of laxity were not correlated to any functional outcome measure or 
      to episodes of instability. CONCLUSIONS: Copers were not different in any 
      meaningful way from the noncopers before injury, had equal or greater 
      side-to-side laxity differences, and functioned normally. A battery of tests was 
      identified that accurately discriminated noncopers from copers even early after 
      injury. Thus, measurements of laxity alone are insufficient for determining 
      functional status after ACL injury.
FAU - Eastlack, M E
AU  - Eastlack ME
AD  - Department of Physical Therapy, Beaver College, Glenside, PA 19038-3295, USA. 
      eastlack@castle.beaver.edu
FAU - Axe, M J
AU  - Axe MJ
FAU - Snyder-Mackler, L
AU  - Snyder-Mackler L
LA  - eng
GR  - 1 R15 HD31695-0/HD/NICHD NIH HHS/United States
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, P.H.S.
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
SB  - IM
MH  - Activities of Daily Living
MH  - *Adaptation, Physiological
MH  - Adolescent
MH  - Adult
MH  - Analysis of Variance
MH  - Anterior Cruciate Ligament/physiopathology
MH  - *Anterior Cruciate Ligament Injuries
MH  - Disability Evaluation
MH  - Female
MH  - Humans
MH  - Injury Severity Score
MH  - Joint Instability/*physiopathology
MH  - Knee Injuries/*physiopathology
MH  - Knee Joint/*physiopathology
MH  - Male
MH  - Middle Aged
MH  - Prospective Studies
MH  - Regression Analysis
MH  - Rupture/physiopathology
MH  - Treatment Outcome
EDAT- 1999/03/04 00:00
MHDA- 1999/03/04 00:01
CRDT- 1999/03/04 00:00
PHST- 1999/03/04 00:00 [pubmed]
PHST- 1999/03/04 00:01 [medline]
PHST- 1999/03/04 00:00 [entrez]
AID - 10.1097/00005768-199902000-00002 [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 1999 Feb;31(2):210-5. doi: 
      10.1097/00005768-199902000-00002.