Abstract

This specification and test method establishes the consistent methods for classifying, and defining the geometric and performance characteristics of five types (cloverleaf, cobra head, reconstruction, straight, and tubular) of metallic bone plates used in the surgical internal fixation of the skeletal system. Also presented here are catalogs of standard specifications for material, labeling, and handling requirements, and standard test methods for measuring performance related mechanical (single cycle bend and bend fatigue) characteristics determined to be important to the in vivo performance of bone plates. This neither defines the levels of performance or case-specific clinical performance for bone plates, nor describes specific designs for bone plates.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Significance and Use

A2.5.1 The test method establishes a uniform four-point bending fatigue test to characterize and compare the fatigue performance of different bone plate designs. This test method may be used to determine a bone plate's fatigue life at either a specific or over a range of maximum bending moment conditions. Additionally, the test method may be alternatively used to estimate a bone plate's fatigue strength for a specified number of fatigue cycles.

A2.5.2 The test method utilizes a simplified bone plate load model that may not be exactly representative of the in-situ loading configuration. The user should note that the test results generated by this test method can not be used to directly predict the in vivo performance of the bone plate being tested. The data generated from this test method can be used to conduct relative comparisons of different bone plate designs.

A2.5.3 This test method may not be appropriate for all types of implant applications. The user is cautioned to consider the appropriateness of the method in view of the devices being tested and their potential application.

A2.5.4 This test method assumes that the bone plate is manufactured from a material that exhibits linear-elastic material behavior. Therefore, the method is not applicable for testing bone plates made from materials that exhibit non-linear elastic behavior.

A2.5.5 This test method is restricted to the testing of bone plates within the materials' linear-elastic range. Therefore, the test method is not applicable for testing bone plates under conditions that would approach or exceed the bending strength of the bone plate being tested.

1. Scope

1.1 This specification and test method is intended to provide a comprehensive reference for bone plates used in the surgical internal fixation of the skeletal system. The standard establishes consistent methods to classify, define the geometric characteristics, and performance characteristics of bone plates. The standard also presents a catalog of standard specifications that specify material; labeling and handling requirements; and standard test methods for measuring performance related mechanical characteristics determined to be important to the in vivo performance of bone plates.

1.2 It is not the intention of the standard to define levels of performance or case-specific clinical performance for bone plates, as insufficient knowledge is available to predict the consequences or their use in individual patients for specific activities of daily living. Futhermore, it is not the intention of the standard to describe or specify specific designs for bone plates used in the surgical internal fixation of the skeletal system.

1.3 This document may not be appropriate for all types of bone plates. The user is cautioned to consider the appropriateness of the standard in view of a particular bone plate and its potential application.

1.4 This document includes the following test methods used in determining the following bone plate mechanical performance characteristics.

1.4.1 Standard Test Method for Single Cycle Bend Testing of Metallic Bone Plates Annex A1.

1.4.2 Standard Test Method for Determining the Bending Fatigue Properties Of Metallic Bone Plates Annex A2.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

E4 Practices for Force Verification of Testing Machines

E467 Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System

E1823 Terminology Relating to Fatigue and Fracture Testing

E1942 Guide for Evaluating Data Acquisition Systems Used in Cyclic Fatigue and Fracture Mechanics Testing

F67 Specification for Unalloyed Titanium, for Surgical Implant Applications (UNS R50250, UNS R50400, UNS R50550, UNS R50700)

F75 Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Castings and Casting Alloy for Surgical Implants (UNS R30075)

F86 Practice for Surface Preparation and Marking of Metallic Surgical Implants

F90 Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Surgical Implant Applications (UNS R30605)

F136 Specification for Wrought Titanium-6Aluminum-4Vanadium ELI (Extra Low Interstitial) Alloy for Surgical Implant Applications (UNS R56401)

F138 Specification for Wrought 18Chromium-14Nickel-2.5Molybdenum Stainless Steel Bar and Wire for Surgical Implants (UNS S31673)

F139 Specification for Wrought 18Chromium-14Nickel-2.5Molybdenum Stainless Steel Sheet and Strip for Surgical Implants (UNS S31673)

F543 Specification and Test Methods for Metallic Medical Bone Screws

F565 Practice for Care and Handling of Orthopedic Implants and Instruments

F620 Specification for Titanium Alloy Forgings for Surgical Implants in the Alpha Plus Beta Condition

F621 Specification for Stainless Steel Forgings for Surgical Implants

F983 Practice for Permanent Marking of Orthopaedic Implant Components

F1295 Specification for Wrought Titanium-6Aluminum-7Niobium Alloy for Surgical Implant Applications (UNS R56700)

F1314 Specification for Wrought Nitrogen Strengthened 22 Chromium - 13 Nickel - 5 Manganese - 2.5 Molybdenum Stainless Steel Alloy Bar and Wire for Surgical Implants (UNS S20910)

F1472 Specification for Wrought Titanium-6Aluminum-4Vanadium Alloy for Surgical Implant Applications (UNS R56400)

F1713 Specification for Wrought Titanium-13Niobium-13Zirconium Alloy for Surgical Implant Applications (UNS R58130)

ISO Standard

Keywords

bend testing surgical implants; fatigue test; bone plate; orthopedic medical devices bone plates; surgical devices; test methods surgical implants; Bend testing--surgical materials; Bone implant materials/applications--specifications; Ductility--metals/alloys; Four-point bending; Metallic bone plates; Orthopaedic medical devices (bone)--specifications; Orthopaedic medical devices (bone plates); Testing methods--surgical implants;

ICS Code

ICS Number Code 11.040.40 (Implants for surgery, prothetics and orthotics)

DOI: 10.1520/F0382-99R08E01

ASTM International is a member of CrossRef.

ASTM F382