title: Sacroiliac kinematics for reciprocal straddle positions.
abstract: METHODS
  A descriptive and correlation approach was used to assess joint motion.
  
  
  OBJECTIVE
  Magnitudes and directions of sacroiliac motion were examined from three different upright postural conditions.
  
  
  BACKGROUND
  Evidence and clinical views suggest that sacroiliac motion available in the normal case is extremely small to nonexistent.
  
  
  METHODS
  Systems for standardizing the three postures and the Metrecom skeletal analysis system (Metrecom, Faro Technologies, Inc., Lake Mary, FL) for acquiring coordinate data for selected skeletal landmarks.
  
  
  RESULTS
  The complete sacroiliac oblique-sagittal motion that occurred between the right forward and left forward stride positions was 9 degrees (SD 6.5). The composite oblique-transverse motion was 5 degrees (SD 3.9). The motions in each plane were significantly different from zero. A joint mobility relationship existed between the hip and sacroiliac joints.
  
  
  CONCLUSIONS
  The results demonstrate that substantial angular motion is possible at the sacroiliac joints.
authors.affiliation: Physical Therapy Graduate Program, College of Medicine, University of Iowa, Iowa City, USA.
authors.forename: G L
authors.initials: GL
authors.lastname: Smidt
authors.forename: K
authors.initials: K
authors.lastname: McQuade
authors.forename: S H
authors.initials: SH
authors.lastname: Wei
authors.forename: E
authors.initials: E
authors.lastname: Barakatt
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D010388:Pelvis / Q000502:physiology; D011187:Posture / Q000502:physiology; D012446:Sacroiliac Joint / Q000502:physiology*