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Sponsors and Collaborators: |
University of Aarhus Aarhus University Hospital Biomet, Inc. |
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Information provided by: | University of Aarhus |
ClinicalTrials.gov Identifier: | NCT00678236 |
The goal of this scientific study is to determine whether there are differences in early migration and prosthesis-near bone density when a standard knee prosthesis is fixed with Refobacin Bone Cement R or with Refobacin Plus Bone Cement. Migration will be evaluated with RSA and bone density around the prosthesis with DEXA. The study will be successful if the prosthesis is fixed and remains in place throughout the entire period of the study, that is, that there is no increasing migration as measured by RSA. The cement type that ensures the largest number of solidly fixed prostheses during the two-year evaluation period will be "the best".
Condition | Intervention |
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Osteoarthritis |
Other: Refobacin Bone Cement R Other: Refobacin Plus Bone Cement |
Study Type: | Interventional |
Study Design: | Diagnostic, Randomized, Single Blind (Subject), Active Control, Parallel Assignment, Safety/Efficacy Study |
Official Title: | A Migration and Bone Density Study Comparing Refobacin Bone Cement R vs. Refobacin Plus Bone Cement in the OptiPac Bone Cement Mixing System. A Prospective Randomized Study on Primary Total Knee Arthroplasty |
Estimated Enrollment: | 50 |
Study Start Date: | June 2008 |
Estimated Study Completion Date: | September 2012 |
Estimated Primary Completion Date: | September 2012 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Active Comparator
Refobacin Bone Cement R
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Other: Refobacin Bone Cement R
Insertion of a knee prosthesis fixed by Refobacin Bone Cement R
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2: Active Comparator
Refobacin Plus Bone Cement
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Other: Refobacin Plus Bone Cement
Insertion of a knee prosthesis fixed by Refobacin Plus Bone Cement
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Loosening of prosthetic components continues to play a large role in total knee alloplasty (TKA) and need for revision. Osteolysis is an important part of prosthesis loosening, but we still do not completely understand the mechanism. Research has shown that mechanical factors such as weak bone cement and poor contact between cement/bone or cement/implant interphase contribute to loosening of implants. Survival of cemented TKA components also depend on a careful balancing of soft tissues around the knee, repair of lower extremity dislocations, design of the prosthesis and the level of patients' activities. Sclerosis of the proximal tibia can present a problem with regard to getting the cement to penetrate into the bone. Poor operative technique, such as high volume or high pressure lavage of the prepared bone surface, can result in reduced penetration of cement into the spongiosa and early failure of the prosthesis, measured as progressive radiolucent lines (RLLs). En tourniquet counter acts bleeding at the implant site and provides for better penetration of cement into the trabeculae of the bone. If the bone surface at the implantation site is contaminated with blood before the cement is applied, the shear strength in the bone/cement interphase can be reduced by up to 50%.
In prosthesis used in this study includes a tibial plateau with a central stem with stabilizing wings, the bottom surface of which is recessed by about 1 mm, so that a pocket is formed surrounded by a lip that provides for an even thickness of the cement layer beneath the tibial plateau. This assures that the cement is pressed down into the spongiosa during fixation of the implant. This design doubles the penetration of the cement compared with prostheses without a depressed baseplate. The company behind this design has had a successful follow-up of this system for more than 15 years. A good cement/implant interphase lessens the risk of penetration of debris into the interphase and thus reduces the risk for the development of osteolysis and aseptic loosening of the implant.
Fixation of knee alloplasties is done in 70% of cases with use of cement. It is uncertain whether there is a difference in the long-term survival of knee prostheses with the two types of cement used in this project. Both types of cement in this study are used today in knee surgery with good, short-term clinical results. It is important to investigate new types of cement in order to assure future patients the best possible results after knee alloplasty and fewer re-operations.
The goal of this scientific study is to determine whether there are differences in early migration and prosthesis-near bone density when a standard knee prosthesis is fixed with Refobacin Bone Cement R or with Refobacin Plus Bone Cement. Migration will be evaluated with RSA and bone density around the prosthesis with DEXA. The study will be successful if the prosthesis is fixed and remains in place throughout the entire period of the study, that is, that there is no increasing migration as measured by RSA. The cement type that ensures the largest number of solidly fixed prostheses during the two-year evaluation period will be "the best".
Ages Eligible for Study: | 70 Years and older |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
Exclusion Criteria:
Contact: Maiken Stilling, MD | 0045 89497466 | mm-p@dadlnet.dk |
Denmark | |
Orthopaedic Center, Aarhus University Hospital | |
Aarhus, Denmark, 8000 |
Principal Investigator: | Kjeld Soballe, MD, Prof. | Orthopaedic Center, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Århus C, Denmark |
Responsible Party: | Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark ( Professor Kjeld Soballe ) |
Study ID Numbers: | 20070237 |
Study First Received: | May 8, 2008 |
Last Updated: | May 14, 2008 |
ClinicalTrials.gov Identifier: | NCT00678236 |
Health Authority: | Denmark: The Danish National Committee on Biomedical Research Ethics |
RSA Gonarthritis Bone Cement |
Musculoskeletal Diseases Osteoarthritis Joint Diseases |
Arthritis Rheumatic Diseases Cimetidine |