Trial reportArthritis care & research2018
Financial Incentives and Health Coaching to Improve Physical Activity Following Total Knee Replacement: A Randomized Controlled Trial.
Trial report in Arthritis care & research, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01970631 (The Study of Physical Activity Rewards After Knee Surgery), which is not on this map. Cited by 29 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
The Study of Physical Activity Rewards After Knee Surgery
Who cites it
29 citing papers in PubMed, 5 syntheses or guidelines pooled it, 61 citations in OpenAlex.
- Clinical practice guideline for physical therapist management of total knee arthroplasty: revision 2026.Physical therapy · 2026Guideline
- Objectively measured physical activity following lumbar decompression surgery: systematic review and meta-analysis.Scientific reports · 2026Pooled it
- Pooled it
- Physical Therapist Management of Total Knee Arthroplasty.Physical therapy · 2020Guideline
- Pooled it
- Reducing Sedentary Time After Knee Replacement Using a Multicomponent mHealth Intervention: Randomized Controlled Trial.JMIR mHealth and uHealth · 2026Trial
- Combined Digital Interventions for Pain Reduction in Patients Undergoing Knee Replacement: A Randomized Clinical Trial.JAMA network open · 2023Trial
- Promoting physical activity via physical therapist following knee replacement: A pilot randomized controlled trial.PM & R : the journal of injury, function, and rehabilitation · 2023Trial
- Feasibility and Preliminary Outcomes of a Physical Therapist-Administered Physical Activity Intervention After Total Knee Replacement.Arthritis care & research · 2020Trial
- Small Social Incentives Did Not Improve the Survey Response Rate of Patients Who Underwent Orthopaedic Surgery: A Randomized Trial.Clinical orthopaedics and related research · 2019Trial
- Comparison of a Patient-Centered Weight Loss Program starting before versus after knee replacement: A pilot study.Obesity research & clinical practiceTrial
- Weight loss and physical activity after total knee replacement: Study protocol for the Healthy Living randomized controlled trial.Osteoarthritis and cartilage open · 2026Article
- Identifying the most effective components of a physical activity intervention for adults with knee replacement: the MOST Energized! study protocol.BMC musculoskeletal disorders · 2026Article
- Unsupervised Frailty Intervention by Digitalized Exercise Coaching: A Feasibility Study.Sensors (Basel, Switzerland) · 2025Article
- KArAT (Knee Arthroplasty Activity Trial): Rationale and design features of a multicenter randomized controlled trial.Osteoarthritis and cartilage open · 2025Article
- The Effects of Motivational Interviews About Activities of Daily Living on Physical Adjustment and Quality of Life in Elderly Total Knee Arthroplasty Patients: A Randomised-Controlled Trial.Healthcare (Basel, Switzerland) · 2024Article
- "Wearable Sensors to Guide Remote Rehabilitation Following Knee Arthroplasty Surgery".Indian journal of orthopaedics · 2023Review
- Effectiveness of the perioperative encounter in promoting regular exercise and physical activity: a systematic review and meta-analysis.EClinicalMedicine · 2023Article
- Article
- Totally Excited about Moving Mobility and Exercise (TEAM MChildren (Basel, Switzerland) · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
11 authors at 3 institutions in 1 country.
Funding
Abstract
objectiveMost persons who undergo total knee replacement (TKR) do not increase their physical activity following surgery. We assessed whether financial incentives and health coaching would improve physical activity in persons undergoing TKR.
methodsWe designed a factorial randomized controlled trial among persons undergoing TKR for osteoarthritis. Subjects underwent normal perioperative procedures, including postoperative physical therapy, and were assigned to 1 of 4 arms: attention control, telephonic health coaching (THC), financial incentives (FI), or THC + FI. We objectively measured step counts and minutes of physical activity using a commercial accelerometer (Fitbit Zip) and compared the changes from pre-TKR to 6 months post-TKR across the 4 study arms.
resultsOf the 202 randomized subjects, 150 (74%) provided both pre-TKR and 6 months post-TKR accelerometer data. Among completers, the mean ± SE daily step count at 6 months ranged from 5,619 ± 381 in the THC arm to 7,152 ± 407 in the THC + FI arm (adjusting for baseline values). Daily step count 6 months post-TKR increased by 680 (95% confidence interval [95% CI] -94, 1,454) in the control arm, 274 (95% CI -473, 1,021) in the THC arm, 826 (95% CI 89, 1,563) in the FI arm, and 1,808 (95% CI 1,010, 2,606) in the THC + FI arm. Weekly physical activity increased by mean ± SE 14 ± 10, 14 ± 10, 16 ± 10, and 39 ± 11 minutes in the control, THC, FI, and THC + FI arms, respectively.
conclusionA dual THC + FI intervention led to substantial improvements in step count and physical activity following TKR.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.