ASTM F543 Annex A1 is used to determine the Torsional Properties of Metallic Bone Screws. The results obtained from this test bear no direct correlation to the torque required to insert a bone screw in human or animal bone. This method is used as a quality control check for maintaining product uniformity or to compare the mechanical properties of different, yet similarly sized, products.
Annex A1 is used to measure torsional yield strength, maximum torque and angle at break for metallic bone screws. A description of the ASTM F543-A1 test procedure is as follows: