Technology Interventions to Improve Outcomes After Knee Replacement

March 6, 2026 updated by: Christine A Pellegrini, PhD, University of South Carolina

Reducing Sedentary Time Using an Innovative mHealth Intervention Among Total Knee Replacement Patients

The purpose of this study is to examine the effects of two technology interventions on health outcomes (e.g., physical activity, sedentary behavior, physical function, pain) after knee replacement at 2 and 5 months .

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Two 8 week technology interventions will be examined and consist of the use of an app and/or website and regular calls. Assessments to examine outcomes will be completed at baseline, as well as at 2 and 5 months.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
83

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • South Carolina
      • Columbia, South Carolina, United States, 29208
        • University of South Carolina

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

40 years to 79 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Be 40-79 years of age
  • Had unilateral knee replacement within last 12 months
  • Have an Android or iOS smartphone that is accessible and near them the majority of the day
  • Be willing to download the study applications on their smartphone
  • Spend at least 7 hours/day sitting
  • Be English speaking

Exclusion Criteria:

  • Have any contraindications to activity
  • Have a mobility limiting comorbidity
  • Have a scheduled surgery within the next 6 months
  • Do not have ≥4 days of valid accelerometer (>=10 hours) wear at baseline.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: NEAT!2
Participants randomized to this arm will use the NEAT!2 app and receive biweekly coaching calls for 8 weeks, and monthly maintenance calls between months 2-5.
Behavioral: NEAT!2
8 week sedentary reduction program
Active Comparator: MyKneeGuide
Participants randomized to this arm will use the MyKneeGuide app/website and receive biweekly coaching calls for 8 weeks, and monthly maintenance calls between months 2-5.
Behavioral: MyKneeGuide
8 week surgery recovery education program

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Objectively Measured (Actigraph) Sedentary Behavior at 2 Months
Time Frame: 2 months
sedentary behavior (<100 counts/minute) measured with Actigraph accelerometers between baseline and 3 months
2 months
Objectively Measured (Actigraph) Sedentary Behavior at 5 Months
Time Frame: 5 months
sedentary behavior (<100 counts/minute) measured with Actigraph accelerometers between baseline and 6 months
5 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Physical Function
Time Frame: 5 months after surgery
Six minute walk test - the number of feet an individual can walk in 6 minutes.
5 months after surgery
WOMAC Pain Subscale
Time Frame: 5 months after surgery
WOMAC Pain Subscale - Scores range from 0 (no pain) to 20 (maximal pain)
5 months after surgery
Total Physical Activity Measured by Actigraph Accelerometers
Time Frame: 5 months after surgery
objectively measured light, moderate and vigorous activity (>= 100 counts/min) by Actigraph accelerometers
5 months after surgery
Adherence to Calls
Time Frame: 2 months
Number of calls completed
2 months
Adherence to NEAT!2 App
Time Frame: 2 months
total days NEAT! app was used
2 months
Response to NEAT!2 Prompts
Time Frame: 2 months
percentage of notifications in which a transition from sitting to standing was detected
2 months
Physical Function Via Chair Stand Test
Time Frame: 5 months after surgery
Chair stand test - how many times a participant can stand up and sit down in 30 seconds
5 months after surgery

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Physical Function Via Timed up and go
Time Frame: 5 months after surgery
Timed up and go test - How fast a participant can stand up, walk around a cone, and return back to the chair and sit.
5 months after surgery
Knee Symptoms - KOOS Pain
Time Frame: 5 months
Knee Injury and Osteoarthritis Outcome Score (KOOS) pain subcale (0 indicates extreme problems, 100 no problems)
5 months
Knee Symptoms - KOOS Symptoms
Time Frame: 2 months
Knee Injury and Osteoarthritis Outcome Score (KOOS) symptoms subcale (0 indicates extreme problems, 100 no problems)
2 months
Knee Symptoms - KOOS ADL
Time Frame: 5 months
Knee Injury and Osteoarthritis Outcome Score (KOOS) activities of daily living (ADL) subscale (0 indicates extreme problems, 100 no problems)
5 months
Knee Symptoms - KOOS Sport/Rec
Time Frame: 5 months
Knee Injury and Osteoarthritis Outcome Score (KOOS) sport/recreation subcale (0 indicates extreme problems, 100 no problems)
5 months
Knee Symptoms - KOOS QoL
Time Frame: 5 months
Knee Injury and Osteoarthritis Outcome Score (KOOS) Quality of Life (QoL) subcale (0 indicates extreme problems, 100 no problems)
5 months
Sedentary Time Via activPAL Accelerometers
Time Frame: 5 months
minutes/day in sedentary time as assessed by activPAL accelerometer worn for 7 days on the thigh
5 months
Patient Reported Outcomes - Mobility - T-Score
Time Frame: 5 months
Patient-Reported Outcomes Measurement Information System (PROMIS) - T score (50 indicates the population mean with a *standard deviation of 10) - (scores higher than 50 represent better function and mobility)
5 months
Patient Reported Outcomes - Global Health - T-Score
Time Frame: 5 months
Patient-Reported Outcomes Measurement Information System (PROMIS) Global Health - T score (50 indicates the population mean with a standard deviation of 10) (scores higher than 50 represent better health)
5 months
Patient Reported Outcomes - Sleep Disturbance - T-Score
Time Frame: 5 months
Patient-Reported Outcomes Measurement Information System (PROMIS) Sleep disturbance - T score (50 indicates the population mean with a standard deviation of 10) (scores higher than 50 represent worse sleep disturbance)
5 months
Sedentary Time Via SIT-Q
Time Frame: 5 months
Self-reported sitting time on weekday in hours/day as assessed by the SIT-Q survey
5 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of South Carolina

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Northwestern University
Prisma Health-Midlands

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Christine Pellegrini, PhD, University of South Carolina

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 1, 2020

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 25, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 25, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 16, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 21, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 22, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 27, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 6, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2026

More Information

Terms related to this study

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • Pro00092132

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

De-identified study data will be made available 12 months after the primary manuscript is published.

IPD Sharing Time Frame

12 months after primary manuscripts are published

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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