ISO/DIS 16436-1:2024
Implants for surgery — Wear of total shoulder-joint prostheses — Part 1: Force and displacement parameters for wear-testing machines and corresponding environmental conditions for test of anatomic total shoulder-joint prostheses
- Standard No.
- ISO/DIS 16436-1:2024
- Release Date
- 2024
- Published By
- International Organization for Standardization (ISO) IX / ISO
- Latest
- ISO/DIS 16436-1:2024
- Introduction
Technical Overview of ISO/DIS 16436-1 Standard
This international draft standard specifies critical parameters for wear testing of anatomic total shoulder prostheses, including:
- Relative angular movement between components
- Applied force patterns and testing duration
- Specimen configuration requirements
- Standardized test environments
Key Testing Parameters
Parameter Specification Tolerance Axial Force 1.11 kN peak ±5% of max value Shear Force Variable waveform ±10% of max value Rotation (x-axis) ±10° range ±5% of max angle Test Frequency 1.0 Hz ±0.1 Hz
Physiological Motion Simulation
The standard replicates in-vivo shoulder kinematics through:
Reference Position: Defined in scapular plane with 10° elevation for stemmed components or 30° for stemless designs
Motion Profile: Combines abduction/adduction with superimposed ±10° rotation around glenoid axis
Force Application: Axial force maintains component contact while shear forces simulated joint loading during elevation
Test Apparatus Requirements
While specialized shoulder simulators may be meeting used, the standard accommodates adapted knee wear simulators ISO 14243-1 requirements when configured with:
- Precision force control systems (±0.5N/mm for shear restraint)
- Temperature-regulated lubricant chambers (37°C±2°C)
- Multi-axis motion control (±0.5% cycle timing accuracy)
- Sealed test environments preventing contamination
Material Testing Protocol
The standard mandates:
Component Requirements Quality Control Test Fluid 30g/L protein concentration calf serum 2μm filtration, pH monitoring Specimens Minimum 3 test + 1 control per group Clinical sterilization methods Wear Measurement Per ISO 14243-2 Gravimetric or dimensional methods
Implementation Considerations
When applying this standard, laboratories should note:
- The test represents one specific wear scenario - additional patterns may be needed for comprehensive evaluation
- Component alignment critically affects results - justification required for non-standard positions
- 5 million cycle duration (≈5 years clinical use) provides substantial wear data
- Annexes AE provide essential tolerance envelopes for waveform compliance
Evolution from Previous Standards
This draft incorporates advancements from:
- ASTM F1378 (shoulder prosthesis specifications)
- ASTM F2028 (glenoid loosening tests)
- ISO 14243 series (knee wear testing methodology)
Key innovations include standardized tolerance envelopes and explicit accommodation of both stemmed and stemless humeral components.
ISO/DIS 16436-1:2024 Referenced Document
- ISO 14243-1 Implants for surgery — Wear of total knee-joint prostheses — Part 1: Loading and displacement parameters for wear-testing machines with load control and corresponding environmental conditions for test
- ISO 14243-2 Implants for surgery - Wear of total knee-joint prostheses - Part 2: Methods of measurement
- ISO 3696 Water for analytical laboratory use; Specification and test methods
ISO/DIS 16436-1:2024 history
- 2024 ISO/DIS 16436-1:2024 Implants for surgery — Wear of total shoulder-joint prostheses — Part 1: Force and displacement parameters for wear-testing machines and corresponding environmental conditions for test of anatomic total shoulder-joint prostheses
