Recovery of mobility after knee arthroplasty: expected rates and influencing factors

J Arthroplasty. 2003 Aug;18(5):575-82. doi: 10.1016/s0883-5403(03)00110-4.


Mobility was measured in 79 people 6 months after knee arthroplasty using timed tests of stair climbing and walking speed. Recovery rates were calculated in comparison with a preoperative assessment. Changes in leg extensor power, knee flexion range, and pain were tracked simultaneously. Stair climbing speed improved on average by 53% during the first 6 months, and walking speed by 45%. In multivariate models, 2 preoperative factors emerged as being influential on recovery of mobility: leg extensor power and body mass index. A marked loss of flexion in the postoperative period was not a significant determinant of mobility speed. At 6 months, body mass index was the most significant determinant of stair speed, and leg extensor power was the most significant determinant of walking speed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Arthroplasty, Replacement, Knee / rehabilitation*
  • Body Mass Index
  • Female
  • Humans
  • Male
  • Middle Aged
  • Movement*
  • Multivariate Analysis
  • Muscle, Skeletal / physiopathology
  • Walking*