Study population and sample size
rheumatic disease, KOA
RHEUMATIC DISEASE
The participants of the study will be people with KOA who are 50 years of age or older, have a TKR scheduled in 8 weeks or more, speak English, have access to a computer, the internet, and a working phone. We will exclude people who are unable to exercise (wheelchair-bound or bedbound), have a history of any joint replacement surgery, or have any rheumatic disease other than KOA.The peer coaches of The sample size estimation assumed four repeated measures, a range of intra-class correlations (0.05 to 0.20) for the repeated measures, and a Bonferroni-adjusted overall type I error of 5% (after controlling for two primary outcomes). We estimate a 20% attrition rate and will recruit 93 subjects, resulting in 37 participants in each arm of the study (total of 