Pool and land exercise with peer support for adults waiting for knee replacement
Checks if a larger study of Good Boost+ is possible in knee osteoarthritis.
Key facts
- Who runs it
- King's College Hospital NHS Trust
- Where
- London, United KingdomSee the site
- Trial code
- Registry title
- Feasibility of Good Boost+ for Adults Awaiting Total Knee Replacement
- Status
- Recruiting
- People taking part
- 48 people, planned
- Started
- Aug 2026
- Expected to end
- Feb 2028
- Type of study
- Interventional, 2 groups
- Treatments tested
- Good Boost+
- Usual NHS Care
- Record updated
- 7 August 2026
Who can take part
AI summary
From the trial's eligibility criteria. Machine-read from the registry text on this page, so it can be wrong. The registry text below and the trial team decide who can take part.
The trial is looking for adults on a waiting list for a first total knee replacement who have moderate knee pain. It tests a water and home exercise programme with peer support.
- Age
- 18 years or over.
- Sex
- All sexes can join.
- Disease stage
- On a waiting list for a primary total knee replacement, with enough time before surgery to finish the 6 week programme and follow-up. Knee pain in the past month of ≥4 but <10 on a 0 to 10 scale.
- Earlier treatment
- People who have already done water exercise sessions through the Good Boost HUB app cannot join.
Main reasons for not taking part
- Another major joint replacement (such as the other knee, hip or shoulder) planned during the study.
- Waiting for repeat surgery on an earlier knee replacement.
- Active inflammatory arthritis (such as RA, PsA, lupus, axial SpA) with symptoms or needing ongoing immune-suppressing drugs.
- Told by a health professional not to exercise.
- Cannot understand or communicate in English, even with help from family or a friend.
The registry criteria, word for word
Show all 14 criteriaShow less
Who can take part
- Aged 18 years or over. Registered on a wait list for primary total knee replacement with sufficient time to complete the 6 week intervention and follow up assessments prior to surgery
- Moderate self reported intensity knee joint pain within the previous month, defined as ≥4 but <10 on the 11 point Numeric Pain Rating Scale (NPRS: 0 = no pain, 10 = worst pain imaginable)
- Willing and able to participate in a six week programme of weekly group water-based exercise at specified leisure centre swimming pools in Southwark and three times weekly land-based exercise training in a private setting
- Willing to pay £4.30 for water-based exercise sessions 5 \& 6. This fee is in line with the usual cost of over 60s group exercise classes at local leisure centres
- Access to a smart phone or tablet computer with internet access. Willing and able to accept either trial arm allocation. Willing and able to give informed consent
Who cannot take part
- Individuals on the waiting list for revision surgery of a previous knee replacement
- Individuals who have previously participated in water-based exercise sessions delivered via the Good Boost HUB application
- Individuals with any other severe concomitant disease that, in the opinion of the investigator might interfere with trial procedures and/or assessments
- Individuals with active inflammatory arthritis (e.g., RA, PsA, lupus, axial SpA) that is clinically symptomatic or requires ongoing immunosuppressive therapy to control disease activity
- Individuals scheduled to have another major joint replacement (e.g. contralateral knee, hip or shoulder) within the study period
- Individuals who self-report being advised by a healthcare professional not to exercise
- Participating or planning to participate in another interventional clinical study/trial during the study period that in the opinion of the investigator could affect the outcomes of this study
- Individuals unable to understand written or spoken English or communicate sufficiently well in English to participate despite assistance from a family member or friend
- Individuals unable to comply with the protocol / requirements of study participation
Where in United Kingdom
- King's College Hospital NHS Foundation TrustLondon, United KingdomContact: Ines ReichertTaking people
About the trial
What the trial wants to find out
The goal of this randomised controlled feasibility trial is to find out whether it is possible to run a larger study of the Good Boost+ community based rehabilitation programme for people waiting for a primary total knee replacement.
Read full original descriptionShow less
The study will look at how many people are willing to take part, whether they stay in the study, and whether they can follow the Good Boost+ programme as planned. It will also explore how acceptable the programme is to patients, NHS staff and leisure centre staff, and which outcome measures are most useful for a future full scale trial. The study will also look at what helps or hinders delivery of the programme in real world NHS and community settings.
The main questions it aims to answer are:
* How many people waiting for knee replacement surgery are willing to take part in the study * Whether participants can continue with the Good Boost+ programme as planned over the study period * Which outcome measures best capture any potential benefits of the programme * How acceptable the programme is to patients, NHS and leisure centre staff * What helps or makes it difficult to deliver the programme in practice.
Participants will be randomly assigned to one of two groups.
* Usual NHS care or * Usual NHS care plus the Good Boost+ programme
Participants in the Good Boost+ programme will take part in six weekly group water based exercise sessions held in local swimming pools, as well as land based exercise sessions that can be done individually or by joining a virtual group. The exercise sessions are delivered through Good Boost's digital technology, using small waterproof tablet computers at swimming pools, and smartphones or computers for land-based sessions. Physiotherapy staff will provide guidance throughout, and volunteers will offer refreshments after pool sessions to support social connection.
All participants, including those receiving usual NHS care only, will be asked to complete an exercise diary, rate their knee pain each week, and complete short questionnaires at 6 and 10 weeks after joining the study.
The 2 groups in the trial
- Usual NHS Care plus Good Boost+Treatment being tested
Participants receive usual NHS pre operative care plus the Good Boost+ programme.
Treatment: Good Boost+ and Usual NHS Care
- Usual NHS CareOther group
Participants receive usual NHS pre operative care only.
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Contact the study team: see the registry record → Contacts and Locations
Print a page for my doctorData and sources
- Registry record
- Listed on ClinicalTrials.gov.
- Official title
- Feasibility of a Community-Based Aquatic Exercise and Peer Support Intervention (Good Boost+) for Adults on Knee Replacement Waiting Lists: A Randomised Hybrid Type 1 Effectiveness-Implementation Feasibility Trial
- Plain-language title
- Pool and land exercise with peer support for adults waiting for knee replacementGenerated from the registry record. The registry title is the official one.
- AI summary
- From the trial's eligibility criteria. Read by machine on 14 November 2026.
- Record updated
- 7 August 2026