title: Lateral balance factors predict future falls in community-living older adults.
abstract: OBJECTIVE
  To prospectively determine the capacity of measures of mediolateral (ML) protective stepping performance, maximum hip abduction torque, and trunk mobility, in order to predict the risk of falls among community-living older people.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  A balance and falls research laboratory.
  
  
  METHODS
  Medically screened and functionally independent community-living older adult volunteers (N=51).
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Measures included: (1) protective stepping responses: percentage of trials with multiple balance recovery steps and sidestep/crossover step recovery patterns, and first step length following motor-driven waist-pull perturbations of ML standing balance; (2) hip abduction strength and axial mobility: (3) peak isokinetic hip abduction joint torque and trunk functional axial rotation (FAR) range of motion; and (4) fall incidence: monthly mail-in reporting of fall occurrences with follow-up contact for 1 year post-testing. One- and 2-variable logistic regression analysis models determined which single and combined measures optimally predicted fall status.
  
  
  RESULTS
  The single variable model with the strongest predictive value for falls was the use of multiple steps in all trials (100% multiple steps) (odds ratio, 6.2; P=.005). Two-variable models, including 100% multiple steps and either hip abduction torque or FAR variables, significantly improved fall prediction over 100% multiple steps alone. The hip abduction and FAR logistic regression optimally predicted fall status.
  
  
  CONCLUSIONS
  The findings identify new predictor variables for risk of falling that underscore the importance of dynamic balance recovery performance through ML stepping in relation to neuromusculoskeletal factors contributing to lateral balance stability. The results also highlight focused risk factors for falling that are amenable to clinical interventions for enhancing lateral balance function and preventing falls.
authors.affiliation: Department of Physical Therapy, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: Marjorie Johnson
authors.initials: MJ
authors.lastname: Hilliard
authors.forename: Katherine M
authors.initials: KM
authors.lastname: Martinez
authors.forename: Imke
authors.initials: I
authors.lastname: Janssen
authors.forename: Beatrice
authors.initials: B
authors.lastname: Edwards
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Mille
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Zhang
authors.forename: Mark W
authors.initials: MW
authors.lastname: Rogers