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Description of ASTM-F2777 2010ASTM F2777 - 10Standard Test Method for Evaluating Knee Bearing (Tibial Insert) Endurance and Deformation Under High FlexionActive Standard ASTM F2777 | Developed by Subcommittee: F04.22 Book of Standards Volume: 13.02 ASTM F2777Significance and Use This test method can be used to describe the effects of materials, manufacturing and design variables on the fatigue/cyclic creep performance of UHMWPE bearing components subject to substantial rotation in the transverse plan (relative to the tibial tray) for a relatively large number of cycles. The loading and kinematics of bearing component designs in vivo will, in general, differ from the loading and kinematics defined in this test method. The results obtained here cannot be used to directly predict in vivo performance. However, this test method is designed to enable comparisons between the fatigue performance of different bearing component designs when tested under similar conditions. The test described is applicable to any bicompartmental knee design including mobile bearing knees that have mechanisms in the tibial articulating component to constrain the posterior movement of the femoral component and a built in retention mechanism to keep the articulating component on the tibial plate. 1. Scope 1.1 This standard specifies a test method for determining the endurance properties and deformation, under specified laboratory conditions, of ultra high molecular weight polyethylene (UHMWPE) tibial bearing components used in bicompartmental or tricompartmental knee prosthesis designs. 1.2 This test method is intended to simulate near posterior edge loading similar to the type of loading that would occur during high flexion motions such as squatting or kneeling. 1.3 Although the methodology described attempts to identify physiological orientations and loading conditions, the interpretation of results is limited to an in vitro comparison between knee prosthesis designs and their ability to resist deformation and fracture under stated test conditions. 1.4 This test method applies to bearing components manufactured from UHMWPE. 1.5 This test method could be adapted to address unicompartmental total knee replacement (TKR) systems, provided that the designs of the unicompartmental systems have sufficient constraint to allow use of this test method. This test method does not include instructions for testing two unicompartmental knees as a bicompartmental system. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM Standards F1223 Test Method for Determination of Total Knee Replacement Constraint F2003 Practice for Accelerated Aging of Ultra-High Molecular Weight Polyethylene after Gamma Irradiation in Air F2083 Specification for Total Knee Prosthesis Other Standards ISO5833 Implants for SurgeryAcrylic Resin CementsKeywords deformation; fatigue; fracture; high flexion; knee; mobile bearing; rotation; TKR (total knee replacement); UHMWPE (ultra high molecular weight polyethylene); ICS Code ICS Number Code 11.040.40 (Implants for surgery, prothetics and orthotics) DOI: 10.1520/F2777-10 ASTM International is a member of CrossRef. ASTM F2777The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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