Gamma Vacuum Foil (GVF) Versus Cross-linked Polyethylene in Total Knee Arthroplasty Study
The purpose of this study is to evaluate long-term clinical and radiographic data between geometrically identical GVF and cross-linked polyethylene-bearing inserts in total knee arthroplasty.
In 1996, Gamma Vacuum Foil (GVF) polyethylene was introduced as the first polyethylene to be gamma irradiated and packaged in an inert environment. This polyethylene, with its patented process and packaging, continues to be the only barrier-packaged process that is impermeable to both Hydrogen (H2) and Oxygen (O2), and allows the polyethylene to recombine and cross-link in the package. Though the new moderately cross-linked polyethylene being evaluated in this protocol is comparable to GVF geometrically and mechanically, the P.F.C.® Sigma™ cross-linked polyethylene also has the added benefit of being completely oxidatively stable both on the shelf and in-vivo.
The P.F.C. Sigma tibial tray component being assessed in this study is made of Cobalt Chrome (CoCr). The new CoCr tibial tray has the same design geometrically as the original titanium (Ti) tray, however, it features a highly polished top surface where it is joined to the polyethylene. This polished surface is designed to decrease the coefficient of friction between the polyethylene and the tray, thus minimizing backside wear. A comparative clinical study will be conducted to evaluate long-term clinical and radiographic data between geometrically identical cemented implants using GVF and crosslinked polyethylene tibial tray bearing inserts in Total Knee Arthroplasty (TKA) using the P.F.C. Sigma Total Knee System. Patients will be assigned to study treatment groups at random if they meet specific demographic and pathophysiologic criteria for cemented total knee arthroplasty. The anticipated duration of this investigation is a minimum six years, which includes a one-year enrollment phase.
The specific aims of this study are as follows:
1. Examine whether crosslinked polyethylene performs as well, if not better, than GVF polyethylene through standard clinical evaluations.
2. Evaluate long-term survivorship rates.
3. Report complications/adverse events.
4. Report radiographic findings of geometrically identical implants.
Allocation: Randomized, Control: Historical Control, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
total knee arthroplasty, total knee arthroplasty
Alabama Orthopaedic Clinic
Active, not recruiting
Results (where available)
- Source: http://clinicaltrials.gov/show/NCT00289133
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
Arthroplasty, Replacement, Knee
Replacement of the knee joint.
Injuries to the knee or the knee joint.
Noninflammatory degenerative disease of the knee joint consisting of three large categories: conditions that block normal synchronous movement, conditions that produce abnormal pathways of motion, and conditions that cause stress concentration resulting in changes to articular cartilage. (Crenshaw, Campbell's Operative Orthopaedics, 8th ed, p2019)
Replacement for a knee joint.
A SYNOVIAL CYST located in the back of the knee, in the popliteal space arising from the semimembranous bursa or the knee joint.
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