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The percentage of participants who improved and declined between the control group and the ACT group for both total knee arthroplasty and total hip arthroplasty. ACT, acceptance and commitment therapy; MCID, minimal clinically important difference; PROMIS, Patient-Reported Outcome Measure Information System; HOOS, Hip Disability and Osteoarthritis Outcome Score; KOOS, Knee Disability and Osteoarthritis Outcome Score.
