title: Pelvifemoral rhythm during unilateral hip flexion in standing.
abstract: OBJECTIVE
  To quantify pelvifemoral rhythm during unilateral hip flexion in standing subjects, under different degrees of resistance.
  
  
  METHODS
  Descriptive and correlational.
  
  
  BACKGROUND
  Pelvic rotation contributes to the change in hip flexion angle while individuals are supine. Degree of contribution in standing has not been described.
  
  
  METHODS
  Pelvic and femoral motions, relative to vertical, were documented while 14 subjects performed three trials of standing unilateral hip flexion, both with and without a 4.53 kg ankle weight. Pelvic and thigh segments were marked with reflective spheres, and motion was captured by video analysis.
  
  
  RESULTS
  Pelvic rotation contributed 18.1% of the change in hip flexion angle. Pelvic rotation occurred throughout the movement. Neither presence of external resistance nor direction of movement significantly changed this contribution.
  
  
  CONCLUSIONS
  A strong relationship exists between pelvic rotation and hip flexion in standing subjects.
  
  
  CONCLUSIONS
  Hip flexion, while standing, is a common element of many functional activities. Knowledge of the pelvic contribution increases our understanding of hip and lumbar spine motion during standing activities.
authors.affiliation: Department of Physical Therapy, School of Allied Health, University of Connecticut, Storrs, CT 06269-2101, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Murray
authors.forename: Richard
authors.initials: R
authors.lastname: Bohannon
authors.forename: David
authors.initials: D
authors.lastname: Tiberio
authors.forename: Michael
authors.initials: M
authors.lastname: Dewberry
authors.forename: Chad
authors.initials: C
authors.lastname: Zannotti
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D005269:Femur / Q000502:physiology*; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D010384:Pelvic Bones / Q000502:physiology*; D012399:Rotation