Prolong® Highly Crosslinked Polyethyleen
Zimmer’s Prolong knie polyethyleen is speciaal ontworpen voor de knie om slijtage en delaminatie tegen te gaan. Een recente publicatie heeft aangetoond dat polyethyleen slijtage de meest voorkomende reden voor een knie revisie was. In deze studie is aangetoond dat 44% van de gereviseerde knieën na de eerste twee jaren van de ingreep direct gerelateerd zijn aan polyethyleen slijtage (Clinical Ortho.2002:404:7-13).
Prolong zorgt voor een forse afname van zowel topside wear als backside wear, het voorkomt oxidatie van het materiaal en geeft vrije radicalen geen kans het materiaal te ondermijnen. Het Prolong polyethyleen is dusdanig vervaardigd dat bij een Posterior Stabilized optie de spine gelijk zo niet nog sterker is in vergelijking met uw standaard polyethyleen. Crosslinking met behulp van E-beam bestraling 6.5 Mrad en “Melt-Annealing (150° C)” zorgt voor optimale crosslinking en stabiele mechanische eigenschappen.
De resultaten van Prolong zijn sinds de introductie in 2001 regelmatig in publicaties beschreven. Twee publicaties vindt u hieronder.
Met Prolong polyethyleen biedt u vooral uw jongere en actieve patiënten een goede en veilige oplossing door de 78% reductie van wear ten opzichte van conventioneel polyethyleen.
Highly Crosslinked Polyethylene in Posterior-Stabilized Total Knee Arthroplasty:
In Vitro Performance Evaluation of Wear, Delamination, and Tibial Post Durability
Abstract
Recent advances in total knee arthroplasty (TKA) include the development of highly crosslinked polyethylene (HXPE). To assess the suitability of using HXPE in posterior-stabilized TKA, knee simulator wear testing and a novel tibial post durability test were performed on a modern posterior-stabilized implant design with both conventional polyethylene (CPE) and HXPE materials. The laboratory testing reproduced clinically relevant wear and tibial post damage mechanisms. For the designs tested, wear volume was reduced by 67% to 75% for aged HXPE compared with aged CPE. Components of HXPE also demonstrated superior tibial post durability compared with the CPE design, despite the use of unaged material to represent best-case CPE tibial post strength. With appropriate design considerations, HXPE can be successfully incorporated into a posterior-stabilized TKA.
Alex P. Stoller, MS, Todd S. Johnson, PhD, Oludele O. Popoola, PhD, Steven M. Humphrey, MS, Cheryl R. Blanchard, PhD
Gepubliceerd in The Journal of Arthroplasy, volume 25, editie 02.
Comparison between highly cross-linked and conventional polyethylene in total knee arthroplasty
Abstract
The use of highly cross-linked polyethylene in total knee prostheses is still controversial. The aim of the present study was to compare radiographic and clinical results of using conventional and highly cross-linked polyethylene in cruciate retaining total knee prostheses of completely the same design. Two hundred and two consecutive total knee arthroplasties (NexGen CR, Zimmer) were performed using the same procedure. The first consecutive 113 knees had conventional polyethylene insert and following consecutive 89 knees had highly cross-linked polyethylene insert (Prolong, Zimmer). Differences in the age, gender, and diagnosis between two groups were not statistically significant. Preoperative range of motion (ROM) of the knee, and Knee Society Score (KSS) was better in highly cross-linked polyethylene group. Clinical and radiographic results were evaluated at two years after operation. The difference of ROM and KSS between groups was not statistically significant. There was no revision surgery. No knee exhibited osteolysis, aseptic loosening, or polyethylene failure. There was no early catastrophic clinical failure due to use of the new material.
Yukihide Minodaa, ab, Masaharu Aiharaa, Akira Sakawaa, Shinichi Fukuokaa, Keiko Hayakawaa, Masuhiro Tomitaa, Naoya Umedaa and Kenji Ohzonoa
A Department of Orthopaedic Surgery, Kansai Rosai Hospital, 3-1-69 Inabasou Amagasaki Hyogo 660-8511, Japan
B Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi Abeno-ku Osaka 545-8585, Japan
Gepubliceerd in The Knee, volume 16, editie 5.