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Rochester, Minnesota 55905


A prospective, randomized, single-blinded clinical trial is proposed to compare a mobile-bearing total knee system with two types of fixed-bearing total knee systems in patients undergoing cemented total knee arthroplasty. The devices to be used are FDA approved: the Sigma Knee System (mobile-bearing), the Sigma, Pressfit Condylar posterior cruciate substituting (fixed-bearing) system with a metal backed tibial tray, and the Sigma press-fit condylar posterior cruciate substituting system (fixed bearing) with an all polyethylene tibial tray. Eighty cases will be assigned to each arm of the study. Each patient will be assessed two months after surgery, one year after surgery, two years after surgery, five years after surgery, and every three to five years thereafter. The principal outcome measures will be the Knee Society Clinical rating scale and the SF-12. The result for these will be analyzed using students' t-test analysis, taking into account classification by demographic variables. Chi-square analysis will be used to compare the instance of mortality, revision surgery, deep vein thrombosis, pulmonary embolus, neurovascular complication, and infection. Other outcome measures incorporated in the Knee Society Clinical rating scale will undergo appropriate generalized linear regression for the type of outcome involved.

Study summary:

Pain, weakness, instability, and progressive dysfunction are the hallmarks of arthritis of the knee. Total knee replacement may frequently be the only therapeutic intervention to provide adequate improvement in pain and function. Both fixed bearing and mobile bearing knees have a long track record of clinical success. Mobile bearing designs have theoretical advantages of decreased contact stresses on the tibial tray, decreased polyethylene wear, and improved range of motion relative to fixed bearing designs. These theoretical advantages may become especially important in the young patient who requires a knee arthroplasty. This study will attempt to see if there is a clinical difference in outcome between mobile bearing and fixed bearing knee arthroplasties in patients who require knee arthroplasty.


Inclusion Criteria: - Patients 40 and 75 undergoing unilateral primary knee surgery for degenerative joint disease (DJD). Exclusion Criteria: - Age less than 40 years or 75. - Severe deformity 20 varus, valgus malalignment. - Osteomyelitis, septicemia, or other active infections that may spread to other areas of the body. - The presence of infections, highly communicable diseases, e.g. AIDS, active tuberculosis, venereal disease, hepatitis. - Significant neurological or musculoskeletal disorders or disease that may adversely affect normal gait or weight bearing. - Metastatic disease. - Any congenital, developmental, or other bone disease or previous knee surgery that may, in the surgeon's judgement, interfere with TK prosthesis survival or success, e.g. Paget's disease, Charcot's disease secondary to diabetes, severe osteoporosis, previous high tibial osteotomy, etc. - Presence of previous prosthetic knee replacement device (any type). - Arthrodesis of the affected knee. - Patients not requiring patella resurfacing.



Primary Contact:

Principal Investigator
Robert T Trousdale, MD
Mayo Clinic

Backup Contact:


Location Contact:

Rochester, Minnesota 55905
United States

There is no listed contact information for this specific location.

Site Status: N/A

Data Source: ClinicalTrials.gov

Date Processed: March 16, 2018

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