Physical function
pain
The KOOS is a self-reported tool used to assess patients’ opinions of their knee function and associated problems. The KOOS has five subscales: pain, symptoms, function in daily living, function in sport and recreation, and knee-related quality of life. Each subscale includes questions with standardized answer options across five Likert boxes scored 0–4. Each subscale was scored independently, with 0 indicating maximum symptoms.The 30-s chair sit-to-stand test (30s-CST) test is the American College of Sports Medicine (ACSM) recommended function and strength measurement test for elderly individuals. Participants were asked to stand from the chair and sit down as many times as possible in 30 s. The MDC value of the 30s-CST is 1.13 s (