Significance and Use
5.1 IBFDs can be single-piece or multicomponent designs and can be porous or hollow in nature. Their function is to support the anterior column of the spine to facilitate arthrodesis of the motion segment.
5.2 Intra-operative IBFD assembly failures can result in significant clinical consequences.4 This test method outlines materials and methods for the comparative characterization and evaluation of the intra-operative impact performance of IBFD assemblies.
5.3 The impact forces applied during a surgical procedure may be highly variable and, therefore, the results from these tests may not directly predict in vivo performance. The results, however, can be used to compare mechanical performance of different IBFD assemblies. The tests may also identify the weakest, most likely to fail points in particular IBFD-inserter combinations, thus enabling design improvements.
5.4 Intra-operative clinical failures may be due to several factors, some of which may not be simulated in the current method. For example, off-axis impact loads applied to the IBFD assembly are not simulated in the current method yet may contribute to intra-operative clinical failures in some designs. The user of this standard should consider incorporating such factors into their evaluations.
Scope
1.1 This test method covers the materials and methods for impact testing of lumbar intervertebral body fusion devices (IBFD).
1.2 This test method is intended to provide a basis for the mechanical comparison among nonbiologic IBFD assemblies (the IBFD and associated inserter tool). This test method is intended to enable the user to compare these IBFD assemblies under impact loads to simulate the intra-operative surgical technique used to insert the IBFD.
1.3 The test method describes the impact test by specifying impact energies and specific methods for applying these energies. The tests are designed to allow for the comparative evaluation of IBFD assemblies.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard, with the exception of angular measurements, which may be reported in terms of either degrees or radians.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
