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Apple watch study tests App-Based recovery for hip and knee surgery

NCT ID NCT03737149

Knowledge-focused Sponsor: Zimmer Biomet Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether a mobile app (mymobility) paired with an Apple Watch can help people recover after hip or knee replacement surgery, possibly replacing standard physical therapy. Over 6,500 adults who were scheduled for joint replacement used the app for guided exercises and activity tracking. Researchers measured readmission rates and joint function scores to see if the digital approach works as well as traditional care.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
mymobility mobile app paired with Apple Watch
What this could lead to
If successful, this could show that a smartphone app and wearable device are a viable alternative to in-person physical therapy after joint replacement surgery.
What could go wrong
This is an observational study, not a treatment trial, so it cannot prove the app causes better outcomes. Results may not apply to all patients or healthcare settings.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

6,559 people

The number who actually took part.

Started

Oct 2018

Finished

Apr 2025

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria 1. Subject must be 18 years of age or older. 2. Subject qualifies for a primary, unilateral total or partial knee arthroplasty, based on physical exam and medical history. 3. Investigator plans to treat subject with a commercially-available device, used on-label according to the manufacturer's instructions for use, as part of their clinical care. 4. Subject owns and maintains an iPhone capable of pairing to the Apple Watch, supporting iOS updates and is compatible with the mymobility App. 5. Subject is willing and able to complete the protocol required follow-up. 6. Subject is able to read and understand the language used in the mymobility App for their region. 7. Subject is willing and able to provide written Informed Consent and Authorization by signing and dating the IRB/EC approved Informed Consent Form and Authorization. Where applicable, subject must also be willing to provide authorization for use of protected health information in accordance with local privacy laws. 8. Subject is mobile with no more than a single cane/single crutch assist preoperatively. Exclusion Criteria 1. Subject is a current alcohol or drug abuser as defined by the investigator. 2. Subject is considered a member of a protected population (e.g., prisoner, mentally incompetent, etc.). 3. Subject has systemic inflammatory arthropathies which would interfere or compromise the activity profiles within this study. 4. Subject is currently participating in any other surgical intervention, physical therapy or pain management study which would compromise the results of this study. 5. Subject requires simultaneous or staged bilateral replacements, staged\<90 days apart. Subjects can be enrolled into the study for the second, staged arthroplasty if scheduled \>89 days after their first, contralateral replacement.

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Conditions

The condition(s) this trial relates to.

Bronchiolitis Obliterans Syndrome osteoarthritis, hip osteoarthritis, knee

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Osteoarthritis, hip Osteoarthritis, knee

Contacts and locations

Locations

  • Ascension Medical Group - University Orthopaedic Specialists

    Rochester Hills, Michigan, 48307, United States

  • Bluegrass Orthopaedics

    Lexington, Kentucky, 40509, United States

  • Cleveland Clinic Florida

    Weston, Florida, 33331, United States

  • Cleveland Clinic Main Campus

    Cleveland, Ohio, 44195, United States

  • Colorado Joint Replacement

    Denver, Colorado, 80210, United States

  • Duke University

    Morrisville, North Carolina, 27560, United States

  • Emory University

    Atlanta, Georgia, 30329, United States

  • Epworth Healthcare - Richmond

    Richmond, Victoria, 3121, Australia

  • Foundation for Orthopedic Research and Education

    Temple Terrace, Florida, 33637, United States

  • Hoag Orthopedic Institute

    Irvine, California, 92618, United States

  • JIS Orthopedics

    New Albany, Ohio, 43054, United States

  • Michigan Orthopaedic Surgeons

    Troy, Michigan, 48084, United States

  • Midwest Center for Joint Replacement

    Indianapolis, Indiana, 46241, United States

  • National Capital Private Hospital

    Canberra, Australian Capital Territory, 2605, Australia

  • New Mexico Orthopaedic Associates

    Albuquerque, New Mexico, 87110, United States

  • Newton-Wellesley Hospital

    Newton, Massachusetts, 02462, United States

  • OrthoBethesda

    Bethesda, Maryland, 20817, United States

  • Orthopedic + Fracture Specialists

    Portland, Oregon, 97225, United States

  • Panorama Orthopedics & Spine Center

    Golden, Colorado, 80401, United States

  • Policlinico Universitario Campus Bio-Medico

    Roma, Italy

  • ROC Orthopedics

    Tualatin, Oregon, 97062, United States

  • Rothman Institute

    Montvale, New Jersey, 07645, United States

  • Rothman Institute

    Bryn Mawr, Pennsylvania, 19010, United States

  • Rush University Medical Center

    Chicago, Illinois, 60612, United States

  • Sah Orthopaedic Associates

    Fremont, California, 94538, United States

  • St. Annaziekenhuis

    Geldrop, Netherlands

  • Stanford University

    Redwood City, California, 94063, United States

  • University of Pennsylvania

    Philadelphia, Pennsylvania, 19104, United States

  • University of Utah

    Salt Lake City, Utah, 84108, United States

  • Washington University

    St Louis, Missouri, 63110, United States

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