Knee Arthroplasty Activity Trial

2019-10-03 07:54:46 | BioPortfolio


Total knee replacement (TKR) is a common and costly procedure widely used to relieve pain and improve function in patients with symptomatic advanced knee osteoarthritis (OA). As of 2013, the annual incidence of TKR was over 680,000 surgeries and annual costs exceeded $11 billion. Growing evidence suggests that while pain and functional status improve following TKR, physical activity (PA) typically does not surpass pre-TKR levels. Engagement in PA can meaningfully improve quality of life (QoL), pain, and function. Given the large investment in TKR, the effectiveness and cost-effectiveness of TKR could be substantially increased if TKR recipients became more physically active.

The Knee Arthroplasty Activity Trial (KArAT) is a randomized control trial and participants will be randomly assigned to one of three arms. Participants across all arms will receive usual post-operative care for TKR surgery. Participants in the first arm will complete basic study activities, such as responding to surveys and attending two in-person clinic visits. Participants in the second arm will receive a wrist-based physical activity tracker intervention and receive phone calls from study staff about improving their general well being. Participants in the third arm will receive a telephonic active coaching (motivational interviewing) and financial incentives (TAC(MI)+FI) based intervention, as well as a wrist-based physical activity tracker intervention. The second and third arms will receive financial rewards for wearing a wrist-worn activity tracker for twelve months during the study.


The investigators have designed the KArAT trial with two specific aims. First, to conduct a parallel three-arm RCT to establish the efficacy and sustainability of the effect of personalized intervention built on the principles of behavioral science and behavioral economics in improving PA among sedentary person who have undergone TKR. Our second aim is to establish the cost-effectiveness and budget impact of TAC(MI)+FI to improve PA in persons who have undergone TKR.

The three arms will include:

Arm 1: Usual post-TKR care

Arm 2: Usual post-TKR care + Wrist-based physical activity tracker wear + Phone calls about general well being

Arm 3: Usual post-TKR care + Wrist-based physical activity tracker wear + Telephonic Active Coaching (Motivational Interviewing) + Financial Incentives (TAC(MI)+FI).

Study Design


Knee Osteoarthritis


Telephonic Active Coaching (Motivational Interviewing) + Financial Incentives, Wrist based activity tracker wear, Phone calls to provide information about general well being, Basic Study Activities


Northwestern Memorial Hospital
United States


Not yet recruiting


Brigham and Women's Hospital

Results (where available)

View Results


Published on BioPortfolio: 2019-10-03T07:54:46-0400

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