ASTM F2267 | Intervertebral Body Fusion Devices | Compression Testing
ASTM F2267 describes a static axial compression test method to evaluate and compare the load-induced subsidence behavior among a variety of non-biologic intervertebral body fusion devices specific to the cervical, thoracic, and lumbar areas of the human spine. Testing per ASTM F2267 requires a universal testing system configured with a subsidence test fixture consisting of both rigid metallic and polyurethane foam blocks. Analysis of device subsidence characteristics enables manufacturers to evaluate the stiffness properties and quantify potential clinical failure modes.
Before conducting ASTM F2267, it is important to read the entire specification in the relevant ASTM publication.
ASTM F2267 | Intervertebral Body Fusion Devices | Compression Testing
Test Method A – Device Stiffness
- Insert the device between two metallic blocks according to the manufacturer’s protocol.
- Mount the device and block assembly into the test system.
- Carry out the axial static test method outlined ASTM F2077 until functional failure is obtained to determine device’s stiffness.
- Remove the metallic blocks after conducting testing per ASTM F2077.
- Record the corresponding force-displacement curve.
Test Method B – Device’s Propensity to Subside
- Insert the device between two polyurethane blocks according to the manufacturer’s protocol.
- Mount the device and block assembly into the test system.
- Apply axial compression to the assembly via position-control as specified in the test procedure.
- Record the corresponding force-displacement curve.
Calculation:
- Stiffness
- Yield Load
ASTM F2267 | Intervertebral Body Fusion Devices | Compression Testing
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