COREV 2.0 PMCF-Study on Manual and Navigated Revision Knee Patients

Study Overview
=================
Brief Summary
-----------------
The Columbus® Revision endoprosthetic system is bearing the CE-mark. This means that within the scope of this observational study the patient will not be subjected to any additional stressful, study-related medical examinations or treatment measures. The treatment will be carried out exclusively according to medical standards. The study therefore only serves the purpose of observing this standard-compliant treatment and specifically documenting it scientifically.

Detailed Description
-----------------
The study's main purpose is the collection of clinical data on the safety and performance of the Columbus® Revision Knee endoprosthesis

Official Title
-----------------
Comparative, Case Control, Mono-center PMCF Study on Manual and Navigated Revision Knee Patients After a Minimum Follow-Up of Two Years

Conditions
-----------------
Knee Osteoarthritis, Bone; Deformity, Congenital, Prosthesis Failure, Prosthesis-Related Infections

Intervention / Treatment
-----------------
* Device: Navigated Revision Total Knee Arthroplasty
* Device: Manual Revision Total Knee Arthroplasty


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Patient underwent navigated revision surgery using the Columbus® Revision knee prosthesis (case group) Patient underwent conventional manual revision surgery using another implant system (control group) Written informed consent Exclusion Criteria: Pregnancy Patient Age at time of revision surgery < 18 years Allergy to any prosthesis component

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| navigation assisted knee revision surgery<br> | Device: Navigated Revision Total Knee Arthroplasty<br>* Patients in the case group receive a Columbus® Revision knee prosthesis, implanted with computer assisted surgery<br>|
| manual procedure<br> | Device: Manual Revision Total Knee Arthroplasty<br>* Patients in the control group will correspond to a historical cohort of patients in which manual jig-assisted knee revision was done.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compare the final joint line height between groups after the surgical restoration of native joint line height of revision implants | Joint line height will be assessed using the systematic, comparative x-ray analysis | Comparison of final joint line height before the surgery with height at the 3 months follow-up | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maintenance of Hip knee Ankle Angle | The HKA within 3 degrees of neutral has been used as the essential outcome measure in TKA. | Comparison of HKA before the surgery with HKA at 3 months and 2 years follow-up | 
| Forgotten Joint Score | The FJS Knee was designed to assess patient outcome in patients undergoing conservative or operative treatment of the knee. These PRO questionnaires focus on patients' awareness of a specific joint in everyday life. In 12 Items the awareness for the artificial joint is assessed by the patient, each on a five point scale (Never / Almost Never / Seldom / Sometimes / Mostly) | At final follow-up at least 2 years after surgery | 
| WOMAC Score | The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a widely used, proprietary set of standardized questionnaires used by health professionals to evaluate the condition of patients with osteoarthritis of the knee and hip, including pain (5 items), stiffness (2 items), and physical functioning (17 items) of the joints. Each item is assessed by the patient on a five point scale (none / slight / moderate / severe / extreme) | At final follow-up at least 2 years after surgery | 
| KSS Score | The KSS is an examiner--administrated standard clinical evaluation tool reporting results for patients undergoing TKA. It separates findings in the operated knee (kKSS) score from findings related to the patient's function (fKSS), which might be affected by co-morbidities. The two sub-scores are reported separately ranging from 0 points (worst result) to 100 points (best results), as well as summarized score, total KSS. Final grading of total KSS results Scores of 160 to 200 will be rated as excellent, 140 to 159 as good, 120 to 139 as fair, and less than 120 as poor. | At final follow-up at least 2 years after surgery | 
| Implant survival | Survival in the sense of this study is defined as a removal or exchange of any revision implant components including the removal or exchange of the PE meniscus component. Secondary interventions at the index knee e.g. secondary patella replacement do not count as a revision if no further exchange of the former implant components occur. The revision-free survival rate is the performance indicator of the product under investigation and confirms the clinical outcome of the knee prosthesis. Information on survival of the implant will be collected until the last follow-up of the study patients took place. | Until final follow-up at least 2 years after surgery | 
| Documentation of Adverse events/serious adverse events | During the course of the study, any upcoming intra- or postoperative (serious) adverse device events or effects related or not related to the product under investigation, will be documented in the dedicated Case Report Forms The total number of AEs will be summarized and further evaluated by the sponsor Recorded complications will be categorized and analyzed in order to assess the safety of the investigational product | over the whole course of the study from surgery until final follow-up at least 2 years after surgery | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Computer Assisted Surgery, Revision, Total Knee Arthroplasty, Joint Alignment, Observational Study, Forgotten Joint Score