A Comparison of Patients Receiving a Total Knee Replacement With Robotic Assistance or With Conventional Instrumentation

Study Overview
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Brief Summary
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A total knee replacement is the removal of parts of the knee joint, that have become damaged due to osteoarthritis, and replacing these with artificial implants. The placement of these artificial implants and how they are aligned with each other is important because they can impact overall knee function and the long-term survival of the implant. It is reported that up to 34% of all patients following total knee replacement (TKR) have poor outcomes functionally. There have been significant developments in knee replacement surgery over recent years. In particular, the introduction of robotic surgical systems, such as the NAVIO and CORI systems (Smith+Nephew Plc). The NAVIO and CORI Surgical Systems are hand-held devices which can support the surgeon with the knee replacement procedure, the systems are image-free and do not require the patient to undergo any scans (such as CT scans). During the surgery, the surgeon uses the NAVIO/CORI hand-held device to map specific landmarks within the knee joint and determines the desired alignment using associated computer software. The tools to remove the bone and place the implants are controlled by the surgeon with the guidance of the NAVIO/CORI software. Comparisons of robotic systems to conventional instruments have demonstrated that robotic platforms produce fewer positioning errors in total knee replacement. This can result in more precise knee alignment and better outcomes following surgery. With both the NAVIO and CORI Surgical Systems there is a reduction in radiation exposure due to them being image-free. At present, there is some evidence available for the long-term outcomes of total knee replacement implanted using robotic assistance (i.e. 2-10 years) however this study is designed to look at the early outcomes following TKR. There is no literature to date to show that robotic-assisted TKR is superior to conventional methods, within the early post-operative period (up to 12 months). This study is designed to show that the NAVIO/CORI surgical systems are better than conventional methods for TKR. The hypothesis is that they will be cost-effective, will reduce the time a patient spends in hospital following their surgery, will improve patient satisfaction during the early recovery period and will improve the patient's early post-operative mobility and function.

Official Title
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A Prospective, Multi-Centre, Randomised Controlled Study to Evaluate the Clinical, Health Economic and Patient Reported Outcomes Following Total Knee Arthroplasty With a Robotic Assisted Technique

Conditions
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Arthritis, Osteoarthritis, Knee, Joint Diseases, Musculoskeletal Diseases, Rheumatic Diseases

Intervention / Treatment
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* Device: NAVIO/CORI Surgical System
* Procedure: Non-robotic conventional instrumentation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject must provide written informed consent Subject must be aged 18 years or older at the time of surgery Subject is listed for a primary total knee replacement (TKR) The indication for the TKR is primary arthritis of the knee joint involving one or more compartments The subject agrees to give informed consent to participate in the study including consenting to any incidental findings being reported to their general practioner (GP) The subject agrees to consent to and to follow the study visit schedule The subject plans to be available throughout the 1-year post-operative period Routine radiographic assessment is possible Exclusion Criteria: The subject undergoes a robotic-assisted TKR on the index joint as a revision for a previously failed surgery, or there is a need for complex implants, or any other implant than a standard total knee arthroplasty (TKA) Subject is listed for a simultaneous bilateral TKR Subject does not understand written or spoken English used in the informed consent form Subject has active infection or sepsis Subject is to have a Smith+Nephew Journey II BCS implanted by non-robotic conventional instrumentation Subject is not available throughout the 1-year post-operative period Subject, in the opinion of the investigator, has a neuromuscular disorder that prohibits control of the index joint Subject is undergoing the surgery as a private patient Patients who, in the opinion of the clinical staff, do not have capacity to give consent Women who are pregnant Subjects with a medical or physical condition that, in the opinion of the investigator, would preclude safe subject participation in the study

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Robotic-Total Knee Replacement (R-TKR)<br>NAVIO/CORI Surgical System | Device: NAVIO/CORI Surgical System<br>* Total knee replacement with robotic assistance<br>|
| Active Comparator: Conventional-Total Knee Replacement (C-TKR)<br>Non-robotic conventional instrumentation | Procedure: Non-robotic conventional instrumentation<br>* Total knee replacement with non-robotic conventional instrumentation<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Forgotten Joint Score (FJS) | Subjects are asked to rate their awareness of their knee arthroplasty in 12 questions with a five-point Likert response format: Never, almost never, seldom, sometimes and mostly. The item scores are summed and linearly transformed in a 0 to 100 scale with a high value reflecting the ability of the subject to forget about the replaced knee joint during the activities of daily living. The change from the baseline scores will be determined for each participant. | Up to 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Oxford Knee Score (OKS) | The OKS contains 12 equally weighted questions on activities of daily living. Responses to each question range from 0-4 with a range of a possible overall score from 0-48. A score of 0 is the worst possible outcome while a score of 48 is the best possible outcome. The change from the baseline scores will be determined for each participant. | Up to 1-year post-operation | 
| Oxford Arthroplasty Early Recovery Score (OARS) | Subjects are asked to complete data regarding how they're feeling around four domains: Pain, Sleep, Nausea and feeling unwell, and Mobility. The OARS questionnaire is scored 0-100 with zero being a poor recovery and 100 being positive and indicative of a good recovery. | Up to 6 weeks post-operation | 
| Oxford Arthroplasty Early Change Score (OACS) | Subjects are asked to score how they feel after their surgery, compared to before, concentrating on areas such as ability, pain, overall feelings etc. The OACS questionnaire is scored from negative 50 to positive 50 with minus 50 being much worse than before surgery to 50 being much better than before surgery. Zero indicates no change from self-reported pre-operative health status. | Up to 6 weeks post-operation | 
| Short-Form 12 Health Questionnaire (SF-12) | The SF-12 is a health-related quality of life questionnaire consisting of 12 questions that measure eight health domains, taken from the original SF-36 questionnaire. The calculations of the Physical and Mental Health Composite scores produce a range of 0-100, a score of zero indicates the lowest level of health and 100 the highest level of health. The change from the baseline scores will be determined for each participant. | Up to 1-year post-operation | 
| EuroQol Five-Dimensional Five-Level (EQ-5D-5L) | The EQ-5D-5L is a health-related quality of life score comprising of 5 domains (mobility, self-care, usual activities, pain/discomfort and anxiety/depression) and the EQ Visual Analogue Scale (EQ-VAS). Patients are asked to rate their level of impairment across each of the domains. Health states are converted into a single index utility score using a scoring algorithm, a score of 1.0 indicates the best health state, lower scores indicate poorer health states. The change from the baseline scores will be determined for each participant. | Up to 1-year post-operation | 
| EuroQol Visual Analogue Scale (EQ-VAS) | The EQ-VAS provides a single global rating of self-perceived health, patients are asked to score their health on a scale of 0-100mm which represents the worst health they can imagine (a score of 0) and the best health they can imagine (a score of 100). The change from the baseline scores will be determined for each participant. | Up to 1-year post-operation | 
| Visual Analogue Score (VAS)-PAIN | Subjects will be asked to complete their pain levels on a scale of 0-100, 0 being no pain experienced and 100 meaning the worst pain possible. The change from the baseline scores will be determined for each participant. | Up to 1-year post-operation | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Robotic, Total Knee Replacement (TKR)