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U.S. Department of Health and Human Services

Recognized Consensus Standards: Medical Devices

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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 056 Date of Entry 06/07/2021 
FR Recognition Number 11-380
ASTM  F2979-20
Standard Guide for Characterization of Wear from the Articulating Surfaces in Retrieved Metal-on-Metal and other Hard-on-Hard Hip Prostheses
1.1 This standard guide provides options and a compendium of information for measuring the bearing surface and estimating the in-vivo wear of explanted Metal-on-Metal (MoM) and other "hard" (for example, ceramic) hip components. The guide covers the measurement of acetabular cups and femoral heads using a dimensional change method and is applicable to all prosthetic hip types, including stemmed (modular) and resurfacing hip systems.

1.2 The methods specified in this guide are not applicable for measuring the in-vivo wear from non-articulating surfaces, for example modular connections (at the stem/neck, neck/head, or cup liner/shell interface) or at the acetabular cup rim.

1.3 The parameters (wear depth and volumetric wear) evaluated and reported in this guide are estimated from the assumed as-manufactured shape of the components. The wear volume is calculated using a numerical integration method and the wear depth is the difference between the assumed as-manufactured shape and the measured surface.

1.4 This guide covers the measurement of the depth of wear and the volumetric wear using a Coordinate Measuring Machine (CMM) and the depth of wear using an Roundness Machine. Other metrology measurement equipment may be used to measure the wear depth or volume if the resolution and accuracy of the measurements are comparable with the instruments detailed in this standard. The measurement and analysis protocols should be based on those described in this standard.

1.5 This guide is applicable to hip joints which are nominally spherical at the time of manufacture. Form deviations resulting from manufacturing or deformation may occur and may necessitate the use of a non-spherical surface to represent the unworn surface of the component. Hip joints designed with asymmetry are considered beyond the scope of this guide, although the principles and techniques may be applicable to the characterization of wear from the articulating surfaces.

1.6 This guide is intended as an extension to Practice F561 as a Stage II nondestructive test.
Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Public Law, CFR Citation(s) and Procode(s)*
Regulation Number Device Name Device Class Product Code
§888.3320 Prosthesis, Hip, Semi-Constrained (Metal Cemented Acetabular Component) Class 3 JDL
§888.3330 Prosthesis, Hip, Semi-Constrained (Metal Uncemented Acetabular Component) Class 3 KWA
N/A Prosthesis, Hip, Semi-Constrained, Metal/Ceramic/Ceramic, Cemented Class 3 LPF
N/A Prosthesis, Hip, Semi-Constrained, Metal/Ceramic/Ceramic/Metal, Cemented Or Uncemented Class 3 MRA
N/A Prosthesis, Hip, Semi-Constrained, Metal/Metal, Resurfacing Class 3 NXT
N/A Prosthesis, Hip, Semi-Constrained, Ceramic-On-Metal Articulation Class 3 OVO
Relevant FDA Guidance and/or Supportive Publications*
Appropriate Use of Voluntary Consensus Standards in Premarket Submissions for Medical Devices - Guidance for Industry and Food and Drug Administration Staff, issued September 2018.
FDA Technical Contact
 John Goode
Standards Development Organization
ASTM ASTM International http://www.astm.org/
FDA Specialty Task Group (STG)
*These are provided as examples and others may be applicable.