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.
The study's main purpose is the collection of clinical data on the safety and performance of the Columbus® Revision Knee endoprosthesis
Study Type
OBSERVATIONAL
Enrollment
100
Patients in the case group receive a Columbus® Revision knee prosthesis, implanted with computer assisted surgery
Patients in the control group will correspond to a historical cohort of patients in which manual jig-assisted knee revision was done.
Hospital Universitario Cruces
Barakaldo, Bizkaia, Spain
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
Time frame: Comparison of final joint line height before the surgery with height at the 3 months follow-up
Maintenance of Hip knee Ankle Angle
The HKA within 3 degrees of neutral has been used as the essential outcome measure in TKA.
Time frame: 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)
Time frame: 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)
Time frame: 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.
Time frame: 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.
Time frame: 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
Time frame: over the whole course of the study from surgery until final follow-up at least 2 years after surgery
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