2.3. Study Design
This study had a single-blind, randomized controlled trial design. The assessors and participants were blinded to the grouping of each participant. Five physical therapists with more than 5 years of musculoskeletal field experience participated in the study procedures. The assessors were trained on equipment usage and measurement methods for 1 h twice a week before evaluating the participants. All evaluations and exercise training were conducted individually. G*Power Version 3.1.9.7 (Franz Faul, University Kiel, Germany, 2020) was used to calculate the sample size (two-tailed, effect value: 0.5, significant level α: 0.05, and power: 0.8) of the study. The number of required samples was 34. Considering a drop-out rate of 10–15%, 40 patients were recruited, and all study participants were pretested. To minimize the error related to the experiment, 40 patients were randomly assigned to the CCE and OKCE groups using the Research Randomizer program (