Crosslinked polyethylene in knee arthroplasty: a simulator study evaluating the positive influence on the tribocontact area in the fixed-bearing knee

Background Crosslinked polyethylene (XPE) was developed to reduce the wear rate in hip as well as knee arthroplasty. The crosslinking process reduces the mechanical properties of ultra-high-molecular-weight polyethylene (UHMWPE), particularly its fatigue strength. UHMWPE fatigue occurs more frequent...

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Veröffentlicht in:Archives of orthopaedic and trauma surgery 2010-11, Vol.130 (11), p.1419-1424
Hauptverfasser: Utzschneider, S., Harrasser, N., Sadoghi, P., Weber, P., Schröder, C., Pietschmann, M. F., Jansson, V.
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container_end_page 1424
container_issue 11
container_start_page 1419
container_title Archives of orthopaedic and trauma surgery
container_volume 130
creator Utzschneider, S.
Harrasser, N.
Sadoghi, P.
Weber, P.
Schröder, C.
Pietschmann, M. F.
Jansson, V.
description Background Crosslinked polyethylene (XPE) was developed to reduce the wear rate in hip as well as knee arthroplasty. The crosslinking process reduces the mechanical properties of ultra-high-molecular-weight polyethylene (UHMWPE), particularly its fatigue strength. UHMWPE fatigue occurs more frequently in the knee than in the hip joint due to its changing tribocontact areas (TCAs) combined with high weight bearing. This is why XPE is still controversially discussed for use in total knee arthroplasty. Therefore, the potential advantage of using XPE in the knee was analysed in a simulator study with a focus on potential fatigue wear mechanisms. Methods Three different kinds of XPE and one conventional UHMWPE were tested over 5 million cycles in fixed-bearing knee designs. The TCAs were examined by replicas, and their extent was measured. The wear mechanism was analysed by scanning electron microscopy. Results The extent of the TCAs was less than 5% for all XPEs, whereas 35% for the conventional UHMWPE. Fatigue wear mechanisms were not observed. Conclusion The measured small extent of the TCAs as a predictor of a low wear rate without any fatigue wear mechanism shows a possible advantage for the use of XPE even in knee arthroplasty.
doi_str_mv 10.1007/s00402-010-1159-3
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Therefore, the potential advantage of using XPE in the knee was analysed in a simulator study with a focus on potential fatigue wear mechanisms. Methods Three different kinds of XPE and one conventional UHMWPE were tested over 5 million cycles in fixed-bearing knee designs. The TCAs were examined by replicas, and their extent was measured. The wear mechanism was analysed by scanning electron microscopy. Results The extent of the TCAs was less than 5% for all XPEs, whereas 35% for the conventional UHMWPE. Fatigue wear mechanisms were not observed. 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F.</au><au>Jansson, V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Crosslinked polyethylene in knee arthroplasty: a simulator study evaluating the positive influence on the tribocontact area in the fixed-bearing knee</atitle><jtitle>Archives of orthopaedic and trauma surgery</jtitle><stitle>Arch Orthop Trauma Surg</stitle><addtitle>Arch Orthop Trauma Surg</addtitle><date>2010-11-01</date><risdate>2010</risdate><volume>130</volume><issue>11</issue><spage>1419</spage><epage>1424</epage><pages>1419-1424</pages><issn>0936-8051</issn><eissn>1434-3916</eissn><abstract>Background Crosslinked polyethylene (XPE) was developed to reduce the wear rate in hip as well as knee arthroplasty. The crosslinking process reduces the mechanical properties of ultra-high-molecular-weight polyethylene (UHMWPE), particularly its fatigue strength. 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Conclusion The measured small extent of the TCAs as a predictor of a low wear rate without any fatigue wear mechanism shows a possible advantage for the use of XPE even in knee arthroplasty.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><pmid>20690024</pmid><doi>10.1007/s00402-010-1159-3</doi><tpages>6</tpages></addata></record>
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subjects Arthroplasty, Replacement, Knee
Basic Science
Biomechanical Phenomena
Equipment Failure Analysis
In Vitro Techniques
Joint surgery
Knee Prosthesis
Medicine
Medicine & Public Health
Microscopy, Electron, Scanning
Orthopedics
Polyethylene
Polyethylenes
title Crosslinked polyethylene in knee arthroplasty: a simulator study evaluating the positive influence on the tribocontact area in the fixed-bearing knee
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