ASTM F1717
ASTM F1717 is a standardized test method used to evaluate the static and fatigue mechanical performance of spinal implant constructs in a vertebrectomy model, which simulates a worst-case loading condition for spinal fixation systems. The standard is primarily applied to posterior spinal assemblies—such as rods, screws, hooks, and connectors—and focuses on the construct’s ability to withstand compressive bending and cyclic fatigue loads after the vertebral body has been removed. Rather than characterizing individual component strength, F1717 assesses the structural behavior of the entire construct, providing metrics such as static ultimate load, yield load, fatigue life, and failure mode. Because it represents a highly conservative and repeatable configuration, ASTM F1717 is widely used by medical-device manufacturers and regulators as a comparative screening tool for spinal implants, particularly during design validation and preclinical testing, even though it is not intended to predict in-vivo performance directly.
Fracture mechanics clevis grips (pin-loaded tensile clevises) are used to apply Mode I opening tension to standardized fracture specimens—most commonly compact tension (C(T)) and related geometries—so labs can measure linear-elastic plane-strain fracture toughness (K₍IC₎) and supporting tensile/fracture data with proper alignment and minimal bending. Clevis systems are typically manufactured to the dimensional and alignment expectations referenced in ASTM E399 (and often used alongside related fracture standards such as ASTM E1820, depending on the program), with grip sizes selected based on specimen thickness/width, pin diameter, and load capacity. ANSI Webstore+2MTS+2
A quick but important note: ASTM F1717 is not a fracture-toughness clevis-grip standard. F1717 covers static and fatigue testing of spinal implant constructs in a vertebrectomy model (a biomechanics test setup). If you’re writing about fracture mechanics clevis grips for K₍IC₎ work, ASTM E399 is the right anchor standard; F1717 is a different application area entirely.
