title: KNEE SYNERGISM DURING GAIT REMAIN ALTERED ONE YEAR AFTER ACL RECONSTRUCTION.
abstract: OBJECTIVE
  To compare the activation of the vastus lateralis (VL) and biceps femoris (BF) muscles during gait, as well VL/BF muscular co-contraction (MCC) between healthy (CG) and anterior cruciate ligament reconstructed (ACL-R) subjects.
  
  
  METHODS
  Nineteen subjects, ten controls and nine ACL-R patients had a VL and BF electromyogram (EMG) captured to calculate the MCC ratio. A Principal Component (PC) Analysis was applied to reduce the dimensionality effect of each of the MCC, VL and BF curves for both healthy and ACL reconstructed groups. The PC scores were used to calculate the standard distance (SD). SD values were employed in order to compare each dependent variable (MCC, VL and BF) between the two groups using unpaired t-test.
  
  
  RESULTS
  ACL-R group presented a lower VL activation at the beginning and at the end of the gait cycle, as compared to the control group. However, no difference was found for BF or VL/BF MCC.
  
  
  CONCLUSIONS
  The gait analysis of ACL reconstructed patients demonstrated a persistent deficit in VL activation when compared to the control group, even one year after surgery. Level of Evidence III. Case Control Study.
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Leporace
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Metsavaht
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Glauber Ribeiro
authors.initials: GR
authors.lastname: Pereira
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Liszt Palmeira De
authors.initials: LP
authors.lastname: Oliveira
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Bernardo
authors.initials: B
authors.lastname: Crespo
authors.affiliation: . Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Luiz Alberto
authors.initials: LA
authors.lastname: Batista
keywords: Anterior cruciate ligament reconstruction; Electromyography; Gait.