Evaluation of Total Ankle Arthroplasty Using Highly Crosslinked Ultrahigh-Molecular-Weight Polyethylene Subjected to Physiological Loading

被引：8
作者：
Bischoff, Jeffrey E. [1 ]
Dharia, Mehul A. [1 ]
Hertzler, Justin S. [1 ]
Schipper, Oliver N. [2 ]
机构：
[1] Zimmer Biomet, POB 708, Warsaw, IN 46581 USA
[2] Anderson Orthopaed Clin, Arlington, VA USA
来源：
FOOT & ANKLE INTERNATIONAL | 2019年 / 40卷 / 08期
关键词：
biomechanics; total ankle arthroplasty; total ankle replacement; conventional polyethylene; highly crosslinked polyethylene; strength; polyethylene fatigue; LONG-TERM; REPLACEMENT; OUTCOMES; WEAR; SURVIVORSHIP; REVISION; BEARINGS; FORCES; MODEL; RISK;
D O I：
10.1177/1071100719847645
中图分类号：
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学（修复外科学）];
学科分类号：
摘要：
Background: Highly crosslinked polyethylene (HXLPE) was developed for its superior wear properties in comparison to conventional polyethylene (CPE). Concern over fatigue resistance has prevented widespread adoption of HXLPE for use in total ankle arthroplasty (TAA). The aim of this study was to determine whether HXLPE has sufficient fatigue strength for total ankle arthroplasty under simulated physiologically relevant motion profiles and loading in the ankle. Methods: Physiologic load and motion profiles representative of walking gait were incorporated into a computational model of a semiconstrained, fixed-bearing TAA to determine the loading state with highest stresses in the HXLPE bearing. Subsequent fatigue testing to 10 million cycles (Mc) at 5600 N was performed to assess bearing strength. Results: Peak stresses in the bearing were predicted at peak axial load and peak dorsiflexion during gait, occurring near heel off. All samples withstood 10 Mc of fatigue loading at that orientation without polyethylene bearing fracture. Conclusion: HXLPE had sufficient fatigue strength to withstand 10 Mc of loading at more than 5 times body weight at the point of peak stresses during simulated gait in total ankle arthroplasty.
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收藏
页码：880 / 887
页数：8
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