Please take a moment to read our participant information sheet
If you would like to take part, you will need to:

1. Click the ‘Join study’ button on the homepage
2. Check that you are eligible to take part.
3. Sign a consent form.
4. Set up a study account.
5. Complete up to 4 tasks. Please find step by step guidance on how to complete the tasks in our User Guide

You can find your NHS number through any of these four ways

• Using NHS Find Your NHS Number webpage - https://www.nhs.uk/nhs-services/online-services/find-nhs-number/
• You can find your NHS number in any documents or letters sent to you by the NHS, such as your prescriptions, test results, hospital referral letters or appointment letters.
• You can find it by logging in to the NHS App (you'll need to register if you have not used it before) or some GP online services.
• You can also call your GP surgery and ask them for your NHS number.

Please find the user guides below:

• General User Guide (PDF) General User Guide (video)
• Apple Guide (PDF) Apple Guide (Video)
• Oura Guide (PDF) Oura Guide (Video)
• Fitbit Guide (PDF) Fitbit Guide (Video)

Yes. You can still take part in the study if you need the assistance of another person.

• If you don’t speak English but have someone who can support you, you’re welcome to join.
• If you need help using the website and have someone who can assist you, that’s okay too.

Please note: some questions in the study are personal (like your name, date of birth, or NHS number), and only you can answer those.

You will need the username and password you created to set up your Fitbit and /or Oura ring account. If you cannot remember your login details, you can either:

1. Go to your account for your fitness tracker and reset your password from there
2. Go through the device connection process on the PAPrKA website (Task 3) and reset your password from there

Yes. You’re eligible to take part if:

• You used an iPhone for at least 6 months before your knee replacement surgery, and
• You’ve continued using an iPhone for at least 1 year after the surgery.

Additionally, your activity data must still be available—either stored on your current iPhone or backed up in Apple iCloud.

Yes. You’re eligible to take part if:

• You used the device for at least 6 months before your knee replacement surgery, and
• You’ve continued using the device for at least 1 year after the surgery.

Additionally, your activity data must still be available, stored in your Fitbit or Oura account.

You’re eligible to take part if:

• You used the device for at least 6 months before your knee replacement surgery, and
• You’ve continued using the device for at least 1 year after the surgery.

You can still take part if you have access to your device’s activity data, stored on your Fitbit or Oura account.

If you cannot access the data, or if you didn’t use your device both before and after your knee replacement, then unfortunately you cannot take part in the study, unless you have another eligible device you can connect instead.

On your iPhone:

1. Open the App Store.
2. Search for “RADAR active RMT” exactly as written.
3. Tap Get, then Open once the app is installed.
4. You should see the app’s Welcome page.

You can find more guidance on connecting your Apple device in the Apple Guide

You can share different data types depending on the device you are connecting:

When prompted in the RADAR active RMT app, you should select the following data types to share:

• Active Energy
• Exercise Minutes
• Flights Climbed
• Heart Rate
• Steps
• Walking + Running Distance
• Cycling Distance
• Workouts

You can either tap “Turn On All” to select everything at once or manually toggle each item from grey to green. Then tap “Allow” to confirm.

On the Fitbit data sharing screen, tick both boxes and click “Allow” to share:

• Activities and Exercise (e.g. step count, distance, time spent active)
• Heart Rate (to understand activity intensity)

Tick all three boxes and click “Accept” to share:

• Sleep, Readiness, and Activity Data (e.g. steps, distance, time active)
• Heart Rate Data (for activity intensity)
• Workout Data (e.g. activity type, distance, intensity)

We collect three types of information:

1. Survey responses provided by you.
2. A one-off collection of physical activity data from 01^st July 2016 to 31^st December 2024.
3. Information about your knee replacement from the National Joint Registry.

This data is collected only once, at the time you join the study and connect your device. No further data will be taken after that.

No.

The study involves a one-off collection of historical data for the period of 01^st July 2016 to 31^st December 2024. Once your data is uploaded and the study is complete, no additional data will be collected.

Yes, you can stop sharing your data at any time by changing your settings on the Fitbit or Oura websites.

It can take approximately 9 days for Fitbit and Oura to send us your data. In some circumstances it might take as long as 4 weeks.

If you remove permission within this time, we might not get all your data, and it may not be used in the study.
If you remove permission after this period of time, we’ll likely already have received your data.
If you would like to remove your data from the study, please contact us at paprka@manchester.ac.uk or 0161 306 2719

For Apple Watch or iPhone
Once you download the Active RMT app and give permission, your phone starts sending your data. If you delete the app within minutes, we might not get all your data, and it may not be used in the study. If you delete the app later, we’ll likely already have your data.
If you would like to remove your data from the study, please contact us at paprka@manchester.ac.uk or 0161 306 2719

Important note: We only plan to collect one copy of your past activity data from 01^st July 2016 to 31^st December 2024.

Fitbit/Oura has your physical activity information organised a bit like books on shelves and they allow us to get one book at a time. This means the research team do not receive your physical activity information all in one go. It could take up to 4 weeks for the research team to receive all the information your agreed to share with us. This is because Fitbit/ Oura has a limit on the amount of information (books) we can ask for each day for the time covering 01^st July 2016- 31^st Dec 2024.

It will take time for us to receive your physical activity data because we are asking for information for about 7 years, and the data contains different types of information e.g., heart rate, distance travelled, duration of exercise. Other things may impact on the time taken for us to receive your data such as loss of network connectivity.

You give permission for the study to access your past activity data from 01^st July 2016 to 31^st December 2024 when you first join and connect your device.

Once recruitment for the study is complete (approx. June 2026), the research team will destroy the permission to access your physical activity data. You don’t need to do anything else—your data won’t be accessed again after that. Important note: We will only collect the physical activity data you agreed to give us when you completed your consent form (past physical activity data from 01^st July 2016 to 31^st December 2024).

If you have any questions, please do contact us at paprka@manchester.ac.uk or 0161 306 2719.

Make sure:

• Your email is valid and active
• Your password meets the 12-character minimum
• You check your inbox for the verification code
• If issues persist, try using a stronger password by introducing more numbers and symbols into the password.

RADAR-base is a platform for the collection of health information from surveys and from smartphones and wearable devices. It is managed by King's College London who have partnered with The University of Manchester to conduct the PAPrKA study. For the study, if you consent to take part, we will collect information from you and your fitness tracker provider on RADAR-base.

You can find more information on RADAR-base on their website: https://radar-base.org/