title: Objective determination of pelvic movement during hind limb lameness by use of a signal decomposition method and pelvic height differences.
abstract: OBJECTIVE
  To evaluate pelvic movement over a large number of strides in sound horses and in horses with induced hind limb lameness by applying methods to the pelvis that have been described for evaluating vertical head movement in horses with induced forelimb lameness.
  
  
  METHODS
  17 adult horses.
  
  
  METHODS
  Horses were filmed while trotting on a treadmill before and after induction of transient mild and moderate hind limb lamenesses. Vertical pelvic movement was measured by a signal decomposition method. The vertical pelvic signal was decomposed into a periodic component (A1) that occurred at half the stride frequency (representing vertical pelvic movement caused by lameness) and another periodic component (A2) that occurred at stride frequency (representing normal vertical pelvic movement of a trotting horse). Vertical pelvic and foot positions were correlated for each stride to compare the difference between the minimum and maximum heights of the pelvis during and after stance of the right hind limb to the minimum and maximum heights of the pelvis during and after stance of the left hind limb.
  
  
  RESULTS
  Maximum pelvic height difference and lameness amplitude (A1) differed significantly between sound and mild or moderate hind limb lameness conditions. Mean A1 value for vertical pelvic movement in sound horses was less than that previously reported for vertical head movement.
  
  
  CONCLUSIONS
  Pelvic height differences and signal decomposition of pelvic movement can be used to objectively evaluate hind limb lameness in horses over a large number of strides in clinical and research settings.
authors.affiliation: Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA.
authors.forename: Joanne
authors.initials: J
authors.lastname: Kramer
authors.forename: Kevin G
authors.initials: KG
authors.lastname: Keegan
authors.forename: Gal
authors.initials: G
authors.lastname: Kelmer
authors.forename: David A
authors.initials: DA
authors.lastname: Wilson
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D005684:Gait / Q000502:physiology*; D006614:Hindlimb / Q000503:physiopathology; D006734:Horse Diseases / Q000503:physiopathology*; D006736:Horses; D007794:Lameness, Animal / Q000503:physiopathology*; D010384:Pelvic Bones / Q000502:physiology / Q000503:physiopathology*; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014741:Video Recording