title: Indoor and Outdoor Mobility following Total Knee Arthroplasty.
abstract: OBJECTIVE
  To determine the relationship between indoor and outdoor mobility capacity in older adults with unilateral total knee arthroplasty (TKA) and, secondarily, to determine walking intensity in the same population and to compare all outcomes to a control group of older adults without knee pathology.
  
  
  METHODS
  In this cross-sectional study, participants (TKA=16, mean 22.9 (SD 9.7) mo post TKA; control=22) completed indoor walking tests and a 580 m outdoor course that included varying terrain (e.g., curbs, grass, sidewalk) and frequent changes in direction. Walking capacity was assessed using stopwatches, global positioning system watches and accelerometers.
  
  
  RESULTS
  Outdoor walking time was moderately correlated (p<0.05) with the timed up-and-go (TUG) test (r=0.65), stair-climb test (SCT) (r=0.67 ascending, r=0.79 descending), 10 m walk test (10 mWT) (r=0.73), and 6-minute walk test (6 MWT) (r=-0.75). Based on activity counts, walking intensity levels for participants in both groups were moderate (outdoor walk and 6 MWT). There was no significant difference in walking capacity between groups (TUG, SCT, 10 mWT, 6 MWT, outdoor walk).
  
  
  CONCLUSIONS
  Common clinical walking tests are moderately correlated with outdoor mobility. Mobility capacity of individuals post TKA was similar to controls in both indoor and outdoor environments, and participants in both groups achieved moderate physical activity levels with walking.
authors.affiliation: School of Physical Therapy, College of Medicine, University of Saskatchewan, Saskatoon.
authors.forename: Ava S T
authors.initials: AS
authors.lastname: Storey
authors.affiliation: School of Physical Therapy, College of Medicine, University of Saskatchewan, Saskatoon.
authors.forename: Ainslie M
authors.initials: AM
authors.lastname: Myrah
authors.affiliation: School of Physical Therapy, College of Medicine, University of Saskatchewan, Saskatoon.
authors.forename: Robyn A
authors.initials: RA
authors.lastname: Bauck
authors.affiliation: School of Physical Therapy, College of Medicine, University of Saskatchewan, Saskatoon.
authors.forename: Danielle M
authors.initials: DM
authors.lastname: Brinkman
authors.affiliation: School of Physical Therapy, College of Medicine, University of Saskatchewan, Saskatoon.
authors.forename: Shawn N
authors.initials: SN
authors.lastname: Friess
authors.affiliation: Department of Physical Therapy, School of Medical Rehabilitation, Faculty of Medicine, University of Manitoba, Winnipeg.
authors.forename: Sandra C
authors.initials: SC
authors.lastname: Webber
keywords: aged; osteoarthritis; outcome assessment; walking