ASTM F543 is a testing standard used exclusively in the biomedical industry that defines specifications for metallic medical bone screws. Bone screws are used in surgical procedures for securing implants, osteosynthesis devices, and fracture fixation plates to the skeletal system. In normal clinical use, a surgeon applies combined axial and torsional forces to implant a bone screw into the body. Bone screws are designated Class 2 FDA devices, requiring significant testing and analysis  of mechanical properties prior to approval and release.

ASTM F543-17 includes multiple annexes which address the properties related to the functional use of bone screws and the axial torsion forces associated with their use. The standard also includes geometric specifications for the design of these devices. The annexes include both purely torsional as well as biaxial testing for a complete evaluation of these devices. To read the standard in full, purchase ASTM F543.

Materials Testing Systems

The axial annexes of ASTM F543 can be performed on a static universal testing system such as Instron's 6800 Series, while the torsional annexes can be performed on a torsion-only system such as Instron's MT Torsion Series. The recent introduction of the Torsion Add-On 3.0 allows both axial and torsional testing to now be performed on a single 6800 Series system.