Women with knee osteoarthritis increase knee muscle co-contraction to perform stand to sit.

Background: There is lack of sufficient research evidence when we examine how knee osteoarthritis (OA) affects performance of stand to sit, a very important task for daily function.

Aim: The aim of this study was to investigate if women with unilateral knee OA perform the stand to sit task in the same way as healthy adults of the same age.

Methods: Fifteen women with knee OA (age 64.