[Purpose] To determine the preoperative self-reported and performance-based physical
function of patients with end-stage knee osteoarthritis who awaited total knee
arthroplasty. The preoperative physical performance factors that predicted self-reported
physical function and quality of life were also identified. [Subjects and Methods] All
adults with end-stage knee osteoarthritis awaiting surgery were enrolled. Before surgery,
self-reported disease-specific physical function and self-reported pain were measured
using the Western Ontario McMaster Universities Osteoarthritis Index, self-reported
quality of life was measured using the EuroQOL five dimensions questionnaire, and physical
performance tests were performed, the 6 minute walk test, the timed up-and-go test,
instrumental gait analysis, and measurement of isometric knee flexor and extensor strength
of the surgical and nonsurgical knees. [Results] In total, 55 adults (49 females; 73.3 ±
6.1 years) were included. This study showed that several preoperative self-reported and
physical performance factors were predictive of self-reported physical function and
quality of life. [Conclusion] In patients with end-stage knee osteoarthritis, preoperative
pain and dynamic balance ability were the most powerful predictors of self-reported
physical function. Preoperative pain and exercise tolerance were the most powerful
predictors of quality of life. Preoperative rehabilitation strategies that focus on
dynamic balance, aerobic, and resistance exercises may improve surgical outcomes.