Suh MJ, Kim BR, Kim SR, et al. - Cross-sectional data from 195 patients who underwent unilateral primary total knee arthroplasty were investigated to ascertain the associations between objective performance-based physical function, self-reported physical function, quality of life, and gait function at 1 mo following unilateral total knee arthroplasty. In bivariate analyses, both postoperative gait speed and gait endurance had important positive relationships with postoperative peak torque of the extensor and flexor of both knees, cadence, stride length, and notable negative association with timed up-and-go, stair-climbing test ascent, stair-climbing test descent, visual analog scale, Western Ontario McMaster Universities Osteoarthritis Index pain, stiffness, and function levels. In the linear regression analyses, for knee pain, factors correlated with postoperative gait speed and gait endurance were postoperative peak torque of the extensors of both knees and VAS. Thus, quadriceps muscle strength of both knees and knee pain were significant factors associated with gait function early following total knee arthroplasty.