Stance time variability during stair stepping before and after total knee arthroplasty: A pilot study

Hum Mov Sci. 2016 Feb:45:53-62. doi: 10.1016/j.humov.2015.11.003. Epub 2015 Nov 17.


The main objectives of this pilot study were to: (1) investigate stance time variability (STV) during stair stepping in older adults with osteoarthritis (OA) before and after total knee arthroplasty (TKA), and compare to an age- and sex-matched group of healthy controls with native knees and (2) evaluate the relationship between quadriceps strength and STV during stair stepping before and after TKA. A prospective, observational, pilot study was carried out on 13 individuals (15% male, mean age 62.71±6.84years) before and after TKA using an instrumented stairway, patient-reported outcomes, timed stair stepping test, and quadriceps strength measures. At 6-months post-operatively, STV during stair descent was significantly greater in the TKA-GROUP compared to the CONTROL-GROUP, but was not significantly different at 12-months compared to controls. There were no significant differences in STV for stair ascent between the pre- and post-operative visits, or compared to controls. There was a trend toward significance for the relationship between quadriceps strength and STV during stair ascent (P=0.059) and descent (P=0.073). Variability during stair stepping may provide an important, short-term rehabilitation target for individuals following TKA and may represent another parameter to predict declines in functional mobility.

Keywords: Motor processes; Rehabilitation; Sensory perception.

Publication types

  • Observational Study
  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Arthroplasty, Replacement, Knee*
  • Female
  • Gait / physiology*
  • Humans
  • Knee Joint / physiopathology
  • Male
  • Middle Aged
  • Mobility Limitation*
  • Muscle Strength / physiology*
  • Osteoarthritis, Knee / physiopathology*
  • Osteoarthritis, Knee / surgery*
  • Pilot Projects
  • Postoperative Complications / physiopathology
  • Prospective Studies
  • Quadriceps Muscle / physiopathology
  • Range of Motion, Articular / physiology
  • Time Factors