Background: The measurement tool used for an accurate balance assessment should produce valid and reliable results in the population in which it is used.
Objectives: To examine whether two performance-based task tests are a reliable and valid measurement test to assess balance in patients with early and advanced knee osteoarthritis (KO).
Design: Reliability and concurrent validity research.
Purpose: The aim of this study is to determine whether the 360° turn test is a reliable and valid evaluator that can be used to assess dynamic balance in patients with early (radiographic grades I and II) and advanced (radiographic grades III and IV) knee osteoarthritis.
Materials And Methods: This study is a methodological research. For the test time and step count of 360° turn test; test-retest reliability were determined by calculating the intraclass correlation coefficient and concurrent validity in patients with knee osteoarthritis was investigated by correlation with the timed up and go test time.